Performance Indicators of Commonly Used Refractory Castables in Cement Plants

Refractory castables in cement plants generally use high-alumina wear-resistant castables, steel fiber castables, low-cement castables, corundum castables, alkali-resistant castables, magnesia-chrome spray coatings, phosphate castables, etc. Of course, there are more high-end ones. For example, the castable for coal injection pipes uses alumina-silicon carbide series refractory castables, which is resistant to thermal shock and alkali. In addition, there are corundum-spinel castables, which have good high-temperature flexural strength and alkali resistance. Next, let’s learn more about the performance indicators of commonly used refractory castables in cement plants.

Silicon Carbide Refractory Castable
Silicon Carbide Refractory Castable

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    Refractory Castable in Cement Plants for Different Parts

    The preheater uses a lower temperature, and generally uses cheaper alkali-resistant castables. The decomposition furnace is prone to skinning and blocking, and anti-skinning castables are generally used. The front and back of the rotary kiln have strong erosion at the mouth of the kiln. Generally, steel fiber castables, kiln mouth castables, and corundum castables are used. The temperature of the kiln door cover is relatively high and there is cold air. Generally, high alumina and low cement castable or steel fiber castable are used. The use conditions of the coal injection pipe are the most demanding, and the special castable for the injection pipe is generally used. When choosing refractory castables for cement plants, you need to look at the life cycle of the refractory castables. No matter how the name and grade of refractory castables change, it is important to meet the production needs of cement kilns. Rongsheng refractory material production and sales manufacturer is specialized in refractory materials for the cement industry. If your cement kiln needs refractory materials, please contact us.

    High strength abrasion resistant castable for sale
    High strength abrasion resistant castable for sale

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      High-Strength Refractory Castable

      High-strength refractory castables are mainly used for parts that are easy to wear in thermal kilns, such as kiln mouths and coal injection pipes. It is formulated with corundum as aggregate, high-quality high-alumina cement as a binder, and a small number of additives. However, this kind of castable is prone to porosity during the pouring process, and it is easy to peel off during the pouring process, and strong growth is relatively slow. In the process of pouring and subsequent curing, drying, and heating, it should be more careful and delicate. JC498-92 “High-strength Alkali-resistant Castable” stipulates its main physical and chemical performance indicators as follows:

      High-strength Alkali-resistant Castable Physical and Chemical Performance Indicators
      Items Excellent Grade Grade I
      Al2O3 (%) ≥ 93 93
      SiO2 (%) ≤ 0.5 1.0
      CaO (%) ≤ 4.0 4.0
      Crushing Strength (MPa) ≥ 110 ℃ 80 60
      1100 ℃ 100 70
      1500 ℃ 120 100
      Flexural Strength (MPa) ≥ 110 ℃ 8 6
      1100 ℃ 9 7
      1500 ℃ 10 9
      Linear Change Rate (%) ≤ 1100 ℃×3h 0.5 ±0.5
      1500 ℃×3h 0.5 ±0.5
      Bulk Density after 110 ℃ drying (kg/m3) ≥ 2900 2900
      Refractoriness (℃) ≥ 1800 1800
      Note: The initial setting time is not less than 30min and not more than 240min.
      Steel Fiber Reinforced Refractory Castable
      Steel Fiber Reinforced Refractory Castable

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        Steel Fiber Reinforced Refractory Castable

        Steel fiber-reinforced refractory castables are made of high alumina bauxite clinker or corundum as aggregates and powders, adding binding agent and the appropriate amount of heat-resistant stainless steel fiber, or adding appropriate additives. The proportion of steel fiber in the clinker should be 4% (weight ratio). Steel fiber in the refractory castable greatly improves the anti-stripping performance of the refractory building material. The distribution of steel fibers has a great influence on the quality of concrete, and random distribution is better. Therefore, the time of vibrating should not be too long. The steel fiber castable must be poured at one time, otherwise, the possibility of peeling between the two layers is very high. The physical and chemical performance indicators specified in JC/T499-92 “Steel Fiber Reinforced Refractory Castables” are as follows:

        Steel Fiber Reinforced Refractory Castables Physical and Chemical Performance Indicators
        Items Ordinary Material High-strength Material
        FA FC FHA FHC
        Al2O3 (%) ≥ 70 83 70 80
        Crushing Strength (MPa) ≥ 110 ℃ 70 70 70 80
        1100 ℃ 40 50 70 80
        Flexural Strength (MPa) ≥ 110 ℃ 9.0 9.0 10.0 12.0
        1100 ℃ 5.5 6.5 10.0 12.0
        Linear Change Rate (%) ≤ 1100 ℃×3h ±0.4 ±0.5 ±0.4 ±0.5

        Other Refractory Castables

        Common refractory castables often have a higher proportion of cement content (10%-15%, weight ratio). But this has caused a series of performance decline of the castable, the reasons are:

        1. In order to completely hydrate the cement, excessive water (10%-15%) is added during mixing, which will increase the porosity of the ceramic refractory castable and decrease the density.
        2. Calcium aluminate hydrate has a strong dehydration and recrystallization effect in the middle-temperature stage, which destroys the structure of the hard spots in the castable, and makes the strength of the refractory castable drop sharply in the middle-temperature stage.
        3. The cementitious binder brings more calcium into the castable, resulting in a decrease in the softening temperature of the ceramicist refractory castable under load and deterioration of thermal shock performance.
        Low Cement Castable Refractory Material
        Low Cement Castable Refractory Material

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          In view of the above problems, low cement refractory castables effectively avoid the regret of high-temperature section performance. Refractory castables with a cement content of less than 8% are called low-cement refractory castables; those with a cement content of less than 4% are called ultra-low cement refractory castables. Compared with ordinary refractory castables, its structure is dense, the apparent porosity is low, the refractoriness is high, the high-temperature strength is high, the load softening temperature is high, and the thermal shock performance is good. However, due to the low cement content, the setting time is long and the early strength is low, which is particularly disadvantageous for construction in winter and low-temperature conditions.

          Chinese refractory materials companies have found in experimental research that adding a small amount of inactive powder (silica fume or Al2O3) below 5 microns into the castable can fill and lubricate the refractory, and can effectively reduce water consumption and increase the castable. The masonry is dense, thereby increasing the strength and resistance to chemical erosion. The low cement refractory casting performance indicators are as follows:

          Low Cement Refractory Castable Performance Indicators
          Items High Alumina Low Cement Refractory Castable Corundum High-Strength Refractory Castable
          GJ – 15B LC – 160 GJ – 18S C – 18S
          Al2O3 (%) 70~75 75~78 ≥ 90 ≥ 93
          SiO2 (%) 1.5~2.0 1.5~2.0 1.5~2.0 ≤ 0.4
          CaO (%) 15~20 12~15 5~7 ≤ 0.5
          Bulk Density (kg/m3) 2600 2700 3100 2880
          Crushing Strength (MPa) ≥ 110 ℃ 100 100 100 80
          1100 ℃ 110 110 110 80
          1500 ℃ 110 110 110 100
          Flexural Strength (MPa) ≥ 110 ℃ 12.0 14.0 14.0 8.0
          1100 ℃ 15.0 15.0 15.0 8.0
          1500 ℃ 15.0 15.0 15.0 9.0
          Linear Change Rate (%) ≤ 1100 ℃×3h -0.4 -0.4 -0.4
          1500 ℃×3h -0.6 ±0.5 -0.6
          Maximum Use Temperature  (℃) 1500 1600 1700 1750
          Reference Water Consumption (%) 5.5~6.5 5.5~6.5 5.5~6.5 7~9
          Rongsheng Refractory Castable Manufacturer
          Rongsheng Refractory Castable Manufacturer

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            Rongsheng Refractory Castable Manufacturer

            Rongsheng refractory castable manufacturer has an advanced and fully automatic unshaped refractory production line with an annual output of 80,000 tons. Rongsheng’s unshaped refractory products include high-aluminum refractory castables, wear-resistant castables, wear-resistant plastics, and anti-skinning castables. It can be applied to a variety of thermal kiln equipment, such as ladle lining, heating furnace lining, cement kiln lining, etc. It is widely used in steel, metallurgy, non-ferrous, chemical, and other industries. If you need to buy refractory castables, get the price of Refractory Castables in Cement Plants, please contact us. We will provide you with services according to your specific needs.

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              Advantages and Performance Requirements of Refractory Castables

              At present, with the rapid development of the refractory castable industry, the Requirements of Refractory Castables are granular powder material composed of a binder and a refractory material and has a certain specific gravity. It can be cast and has high fluidity. High-temperature castables made of refractory materials have higher cohesiveness, water content, and fluidity than other castables. In practice, the required materials and adhesives can be selected according to the conditions of use, and the lining can be directly cast, or the preform can be cast or compacted. Therefore, the application range of prefabricated blocks is wider.

              Rongsheng High Alumina Refractory Castable Manufacturer
              Rongsheng High Alumina Refractory Castable Manufacturer

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                Operational Advantages of Refractory Castables

                Refractory castables need to be operated at high temperatures during operation. High-temperature castables should have the function of not softening or melting at high temperatures. It also has an excellent load softening temperature. High-temperature castables can withstand the load in the kiln and the stress during operation, and will not lose structural strength at high temperatures, and will not soften and collapse.

                When the refractory castable is used at high temperatures, its volume will change due to the physical and chemical lining inside the castable. The production and testing of refractory and high-temperature castable materials are strictly in accordance with the requirements. Professional inspectors test the quality of refractory castable layer by layer to bring you high quality.

                Rongsheng Silicon Carbide Refractory Castables
                Rongsheng Silicon Carbide Refractory Castables for Sale

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                  Classification of Refractory Castables

                  According to the material classification of refractory castables, refractory castables include high alumina castables, corundum castables, silicon carbide castables, clay castables, silicon castables, magnesium castables, etc. According to the main purpose, it can be divided into impervious castable and hot castable. The production cycle of high-temperature castables is usually shorter than that of refractory bricks of the same material. Therefore, the sales volume of high-temperature castables is very large.

                  The requirements of Refractory Castables are high formulas, reasonable particle size distribution, and the type and amount of additives have a great influence on the castables. The structure of the castable and the drying of the oven should be carried out in strict accordance with the requirements to ensure the service life of the castable. Due to a series of objective reasons, such as application environment and engineering progress, some additives or other materials can be added to the casting to meet the requirements. For example, in order to increase the strength of the castable, a certain amount of heat-resistant steel fiber can be added to the castable, or some accelerators can be added to accelerate the initial setting time of the castable.

                  Corundum Self-flowing Wear-resistant Castable
                  Corundum Self-flowing Wear-resistant Castable

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                    Refractory Castables with Special Properties

                    The special application environment makes it necessary to adjust the proportion of refractory castables to improve the performance of the castables. For example, low cement castables for furnaces. Because the performance of the castable decreases with the addition of cement, in order to meet the conditions of use, the amount of cement must be reduced. By adding modified materials to increase the strength of the castable, and prevent the decrease in the amount of cement from affecting the strength.

                    Self-flowing castable, also known as non-vibration castable. It not only has performance similar to low cement and ultra-low cement castables but also has rheological characteristics. Therefore, it can flow and degas without external force. Compared with vibrating castable, it has the characteristics of self-flowing and self-leveling, smooth and pumpable construction surface, short construction time, no noise, and low labor intensity. Especially suitable for pumping construction and use in thin-layer and multi-arch areas. Therefore, in recent years, it has continuously received attention at home and abroad and its use range has been continuously promoted. In the cement industry, metallurgical industry, and non-ferrous metals industry. Such as the permanent lining of the tundish, the lining of the movable fume hood for the secondary smelting below the bottom of the blast furnace, the trough induction insulation layer for cast iron, the lining of the civil waste incinerator, etc., the use effect is very good.

                    Low Cement Castable Refractory Material
                    Low Cement Castable Refractory Material

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                      There are many factors that affect the rheology of the castable, such as the limit size, shape, distribution, water absorption of the particles, the nature and amount of the binder and dispersant, the amount of water added, and the mixing and stirring process. But the most important influence is the combination system, particle size distribution and the nature and amount of dispersant added.

                      The amount of cement added has a significant effect on the fluidity of the castable. Calcium aluminate cement needs an appropriate amount of water in the process of forming hydration products. When the amount of water added is the same, the amount of cement added will inevitably reduce the amount of free water and reduce the fluidity of the castable. But if the amount of cement is too small, it will affect the strength of the castable at low temperatures. Therefore, under the premise of ensuring the strength of the castable, the amount of cement should be appropriately reduced. In ultra-low cement castables, cement mainly acts as a delayed accelerator. The research on the rheological properties of corundum spinel-calcium aluminate suspension shows that with the increase of calcium aluminate cement, the yield stress and plastic viscosity of the suspension tends to increase.

                      Rongsheng Refractory Castable Manufacturer
                      Rongsheng Refractory Castable Manufacturer

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                        Rongsheng Refractory Castable Manufacturer

                        Castable is also called refractory castable, which is a kind of unshaped refractory. The manufacturer of Rongsheng refractory castables pointed out that the Requirements of Refractory Castables are easy to construct and have good integrity. They can be used for the lining of a variety of industrial kilns and can also be used to make preforms. Rongsheng’s advanced and fully automatic unshaped refractory castable production line can produce a wide variety of castables, which can be differentiated according to different dimensions. Among them, according to the characteristics, there are mainly high-strength wear-resistant castables, high-temperature castables, low-cement castables, steel fiber castables, acid-resistant, and heat-resistant castables, and other castables with characteristics. If you want to buy monolithic refractory products and know the price of monolithic refractories, please contact us. We will provide you with services according to your specific needs.

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                          What are the Lining of the Heating Furnace?

                          The heating furnace is divided into furnace, fuel system, air supply system, smoke exhaust system, and cooling system. The furnace is a space composed of the furnace wall, the furnace top, and the furnace bottom, and different pouring materials are used for each part. Let us understand the refractory materials used in the lining of the heating furnace.

                          Refractory Lining of the Heating Furnace
                          Refractory Lining of the Heating Furnace

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                            1. Low-cement castables are used to wrap the structure of water beam-columns. The column tube and the lower part of the supporting beam in the furnace are all made of low cement castables. Low-cement castables are also used in the low-temperature zone of the heating furnace, flue parts, and furnace body parts that do not exceed 1300°C.
                            2. Self-leveling castables are used in the heating furnace where the structure is complicated and cannot be vibrated manually. The use temperature is 1500℃, which is characterized by good thermal shock resistance, high refractoriness, easy construction, and almost no need for vibration.
                            3. Phosphate castables are suitable for heating furnace bottoms and other parts that are severely affected by material friction and hot air erosion. The operating temperature is between 1000-1600°C. It is a castable with phosphoric acid or phosphate as the binder and aluminum calcium cement and magnesia as the accelerator.
                            4. Mullite castable. Because mullite refractory castable has high thermal shock resistance, erosion resistance, good erosion resistance, good volume stability, and high service temperature. It is generally used in key parts such as furnace walls, furnace roofs, and press beams.
                            5. Anti-dry slag castable, suitable for the bottom of the heating furnace, and the place where iron oxide slag is deposited. The use temperature can reach 1600℃. Its main characteristics are high refractoriness, good thermal shock resistance, and good resistance to the corrosion of iron oxide slag in the heating furnace.
                            6. Lightweight castable, suitable for heat insulation layer of the furnace wall, furnace roof, flue, etc. High-strength lightweight castables can also be used as working linings for smoke exhaust systems and hot air ducts. It is characterized by low bulk density, good thermal stability, low thermal conductivity, and certain refractoriness.
                            7. Bauxite cement castable is a castable produced by mixing various refractory aggregates and powders in a certain proportion with aluminate cement as a cementing agent. It has the characteristics of fast solidification, high strength, thermal shock resistance, and slag resistance. It not only meets the refractory performance of the heating furnace body but also improves the construction performance of the furnace body.
                            8. The advantage of fire-resistant plastic is that there are no gaps in the overall construction and good airtightness. The furnace lining uses a large number of plastic materials instead of castables and is mainly used for the top of the furnace.
                            Low Cement Castable Refractory Material
                            Low Cement Castable Refractory Material

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                              What is the Meaning of the Refractory Castables Grades?

                              The various castables used for the lining of the heating furnace have been introduced above. How to make a specific distinction between them? This introduces the definition of refractory castable grades. What is the meaning of refractory castable grades? It is usually used in combination with numbers and pinyin letters to distinguish the material, performance, and purpose of the castable. Refractory castable grades have refractory standards and the settings of different castable manufacturers. Next, we will learn about the types and grades of common refractory castables.

                              Classification of Refractory Castables

                              1. Classified by material, silicon castable, clay castable, high alumina castable, mullite castable, corundum castable, aluminum-magnesium castable, etc.

                              2. According to the purpose, it can be divided into several types of castables for industrial furnaces, such as castables for steel rolling furnaces, castables for tapping channels, castables for mixing furnaces, and castables for cement kilns.

                              3. According to the bulk density, it can be divided into light castable and heavy castable.

                              4. According to its characteristics, it can be divided into refractory steel fiber reinforced castable, anti-skinning castable, low cement castable, high-strength castable, etc.

                              Mullite castable price
                              Mullite Refractory Castable with High-Quality

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                                Grades of Refractory Castables

                                1. Brands of silicon castables: rsg-70, rsg-60, rsg-50, etc. Among them, rs is the manufacturer of Rongsheng castables, G is the main material selected for castables is silicon, and the quantity is the silicon content.

                                2. Brand of castable clay: nn-45. Among them, the first n is clay as the binder, and the second n is the main material selected for the clay castable. The number is the main component content of the clay castable)

                                3. Grades of high-aluminum castables: nl-70, nl-60. Among them, n is clay as a binder, l is the main material selected for the castable is high aluminum material, and the quantity is the aluminum content of the high aluminum castable.

                                4, aluminum-magnesium castable grades: amc-70, amc-80, etc. Among them, a, m, and C are the English initials of alumina, magnesia, and castable. The number is the content of the main raw materials selected for aluminum-magnesium castables.

                                1. Castable grades for steel rolling heating furnace: zj-42, zj-60, zjs-65, etc. Among them, Z is the steel rolling heating furnace, J is the castable, and s is a part of the water-cooled tube of the heating furnace. The number is the main material content selected for the castable of the steel rolling heating furnace.

                                6. Grades of castable for iron ditch: Asc-1, Asc-2, Asc-3. Among them, a, s, and C are the English initials of alumina, silicon carbide, and carbon. The number is only used to distinguish the castable grade.

                                The above is the introduction of a refractory castable brand. Hope you can understand the meaning of the casting brand after reading it. There are many brands of refractory castables, some are set by the castable manufacturers themselves, and some are set in accordance with refractory standards. No matter what way the refractory castable is named, it is to distinguish the material, grade, performance, and purpose of the refractory castable.

                                Rongsheng Refractory Castable Manufacturer
                                Rongsheng Refractory Castable Manufacturer

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                                  Rongsheng Refractory Castables Manufacturer

                                  Rongsheng refractory castable manufacturer has an advanced and fully automatic unshaped refractory castable production line with an annual output of 80,000 tons. Rongsheng has provided high-quality refractory castables, mullite castables, self-flowing refractory castables, wear-resistant refractory plastics, corundum mullite refractory plastics, etc. for many turnkey projects. For more information about the refractory castables Lining of the Heating Furnace, Rongsheng’s monolithic refractory products, and Rongsheng refractory manufacturers, please contact us. We will provide you with services according to your specific needs.

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                                    How to Improve the Performance of Refractory Castables?

                                    With the continuous progress in the production and use of refractory castables, it is necessary to improve the wear resistance and thermal shock resistance of refractory castables. The research and development of new refractory castables with excellent high-temperature strength, good thermal shock resistance, and good corrosion resistance will help improve the life of cement kiln linings. Rongsheng refractory manufacturer. There are two important measures to improve the performance of refractory castables. In this article, you can also learn another two ways to improve the performance of refractory castables.

                                    Corundum Self-flowing Wear-resistant Castable
                                    Rongsheng Corundum Self-flowing Wear-resistant Castable

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                                      Improve the Wear Resistance and Thermal Shock Resistance of Refractory Castables

                                      1. Measures to improve the wear resistance of wear-resistant castables
                                      • Reduce the critical particle size of the castable. From 8mm to about 5mm.
                                      • Improve the flexural strength of the castable in the medium temperature and hot state. At a medium temperature of 900°C, the flexural strength of the castable indirectly reflects the wear resistance of the castable. The current development trend is to require the hot flexural strength of the castable to be no less than 20MPa.
                                      • Improve the bonding ability of the castable matrix. It is formulated with multi-level micro powder and super micro powder to form the tightest accumulation. Promote sintering at medium temperature and improve the bonding ability of the castable matrix.
                                      • Use high-hardness refractory materials as aggregates.
                                      1. Measures to improve thermal shock resistance of wear-resistant castables

                                      Firstly, It adopts composite aggregate and composite powder, that is, complex phase technology. The difference between the linear expansion coefficient of aggregate and matrix is used to balance the strength and thermal shock resistance of the castable.

                                        •  High expansion aggregate + low expansion matrix. This combination is very resistant to thermal shock.
                                        •  Low expansion aggregate + low expansion matrix. This combined castable has uniform bonding and high mechanical strength. General thermal shock will not produce huge stress in the castable, and cracks will appear.

                                      Then, Reduce the thermal expansion rate of the material. Try to choose materials with a relatively low thermal expansion rate to improve the thermal stability and mechanical impact of the castable.

                                      Low Cement Castable Refractory Material
                                      Low Cement Castable Refractory Material

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                                        How to Improve the Performance of Refractory Castables?

                                        In addition, the performance of refractory castables can also be improved according to the application characteristics of refractory materials.

                                        Add water reducing agent to refractory castable

                                        Seeing such topics, it is estimated that everyone is like me, the first thing that comes to mind is what is the use of refractory castables added to water-reducing agents.

                                        The water reducing agent is added to the castable, which can significantly reduce the amount of mixing water added during the construction of the castable. In the case of constant water consumption during the construction of the castable, it can also increase the fluidity or plasticization of the castable.

                                        Water reducing agent is an electrolyte material of surface-active substance, which is dissolved in castable and can be adsorbed on the surface of particles. By increasing the repulsive force between the ion surface and the particles in the solution, the free water which is composed of fine particles and wrapped in the castable structure is released. It plays a role in wetting and dispersing. Water reducing agents can also be called a dispersing agent.

                                        Water reducing agent is a dispersant or flow agent of high alumina cement, which plays a plasticizing or deflocculating role in refractory castables. Under the condition of keeping the flow value of the refractory castable basically unchanged, the water reducing agent does not chemically react with the comprehensive components of the raw and auxiliary materials in the castable, nor does it generate compounds, but only plays a physical and chemical role on the surface.

                                        Because the water reducing agent can release the free water in the castable structure. Therefore, while keeping the fluidity of the castable unchanged, the water consumption during the construction of the castable can be reduced. Or under the condition that the castable does not change the unit water consumption, increase the rheology of the castable, improve the working skills, and make the refractory castable easier to construct and shape.

                                        Steel Fiber Refractory Castable for Sale
                                        Steel Fiber Refractory Castable for Sale

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                                          Add steel fiber to refractory castable

                                          In the production of refractory castables, steel fiber refractory castable products of different diameters are added. Steel fiber is a product made of heat-resistant and wear-resistant stainless steel or other steel types. Common steel fiber specifications are 20mm, 25mm, 30mm, and 35mm. Steel fiber castable is a refractory castable with high strength, good thermal shock resistance, and good wear resistance. Adding steel fiber to the refractory castable can enhance the performance of the castable and increase the use effect.

                                          The effects of adding steel fiber to refractory castable are:

                                          (1) Enhance the toughness of the lining, improve the resistance to mechanical impact, and wear resistance.

                                          (2) Improve thermal shock resistance, improve cracking, and peeling resistance.

                                          (3) Suppress linear shrinkage after curing, drying, and heat treatment.

                                          The refractory castable is added with steel fiber to enhance the use effect after pouring, but the amount of steel fiber added to the castable is determined according to the requirements of the technical department. Too much steel fiber added to the castable can cause damage to the lining at high temperature after pouring, reduce the corrosion resistance of the lining, and affect the performance of the kiln lining.

                                          Rongsheng Refractory Castable Cement Manufacturer
                                          Rongsheng Refractory Castable Cement Manufacturer

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                                            Rongsheng Refractory Castable Manufacturer

                                            The Rongsheng refractory castable manufacturer has an advanced and fully automatic refractory castable production line with an annual output of tons. Rongsheng is a strong refractory material manufacturer and sales company. Rongsheng has served customers in more than 60 countries around the world. For example, etc. Moreover, our refractory family R&D team is also working hard to provide customers with refractory linings that best suit their production needs. If you want to know the manufacturer of Rongsheng refractory materials or want to obtain a quotation of refractory materials, such as low cement castable, phosphate bonded castable, high alumina castable, corundum castable, etc. please contact us. We will provide you with services according to your specific needs.

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                                              What are the Functions of Micro-Powder in Refractory Castables?

                                              The basic mechanism of micro-powder in refractory castables is filling and lubrication. The micro powder can be used to fill the gap between aggregate and powder, reducing the amount of water used. After the molded body removes water, there are fewer holes left, which can increase the bulk density and reduce the apparent porosity. Thereby improving the structural strength of the material and optimizing material performance. In addition, the fine powder particles can form colloidal particles in water. When there is a dispersant, the particle surface forms an overlapping electric double layer to generate electrostatic repulsion, which overcomes the van der Waals force between the particles. Reduce the interface energy and prevent the particles from adsorption and aggregation. At the same time, the dispersant is adsorbed around the particles to form a solvent layer. Therefore, the fluidity of the castable is also increased, and the performance of the refractory castable material is optimized.

                                              Silica Micro-powder in Refractory Castable
                                              Silica Micro-powder in Refractory Castable

                                              Micro-powder Used in Refractory Castables

                                              In refractory castables, the most used micro powders are active SiO2 powder and a-AL2O3 powder. Followed by SiC powder, high alumina powder, white corundum powder, brown corundum powder, zircon powder, and spinel powder. The function of micro-powder in refractory castables is to fill and lubricate and increase fluidity.

                                              The Silica Powder Added in the Refractory Castables

                                              The SiO2 powder used in the refractory industry is mainly micron-sized. There are many types of SiO2 micro powders, among which silica fume has good performance and a wider range of applications. It is a by-product of ferrosilicon alloy plants and metal silica plants. In addition, there are natural mineral powder quartz, SiO2 powder milled by a grinder, and white carbon black powder. Electronic industry by-products, active SiO2 powder on the surface treated by silane coupling. Fused silica powder. When using zircon to produce desiliconized zirconium dioxide, the collected by-product-silica powder, and the silica powder collected in the production of metal silica.

                                              Aluminum Silicon Carbide Castables
                                              Aluminum Silicon Carbide Castables

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                                                What is the role of silica powder in refractory castables?

                                                Silica powder is added to the refractory castable to supplement the tiny pores. Through the precise particle gradation of ultra-fine powder, the strong performance of the castable is improved.

                                                The strength of refractory castable comes from high alumina cement, and the CaO in high alumina cement reaches 5% to 8%. It will reduce the medium temperature strength of refractory castables. If the amount of low melting material is large at high temperature, it will also reduce the high-temperature performance of refractory castable. The CaO in high-alumina cement will produce hydration, and the amount of water used will increase after hydration. If the amount of water is large, the castable structure will become loose. If the superfine powder is added, the cement content in the castable can be reduced to 6%. Reduce the CaO and water consumption in the high alumina cement, thereby increasing the strength of the castable. This is the importance of silica powder in refractory castables.

                                                High alumina refractory cement
                                                High Alumina Refractory Cement

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                                                  Silica powder is an essential raw material in refractory castables. Adding silica powder to the castable will increase the flow value of the castable. The silica powder has a small particle size and is a spherical particle, which is extremely easy to enter the tiny voids of the castable. Therefore, adding silica powder has good water reducing effect. It can also increase the density of refractory castables and reduce porosity. So that the strength of the refractory castable is better.

                                                  The compressive strength of the refractory castable after adding silica micro powder will also change significantly at different temperatures. The initial strength is 110°C, and the medium temperature strength is 1100°C. Due to the fineness activity of SiO2 powder and the fluxing effect of CaO and other impurities in the refractory castable, a strong ceramic bond will be produced. When the high-temperature strength is 1450℃, the silica powder and the alumina powder will form mullite at high temperatures. The porosity of the refractory castable is reduced and the high-temperature strength is better.

                                                  α-Al2O3 Powder

                                                  The α-Al2O3 micro powder is made after calcining industrial alumina. Its characteristics are good dispersibility, small particles, easy sintering at high temperature, and small volume effect. Adding a certain amount of α-AL2O3 micro powder in refractory castables has a significant impact on its construction performance. Adding an appropriate amount of α-AL2O3 micro powder to the castable can improve the refractoriness of the refractory castable, and cause caramelization and multimerization reactions at high temperatures. On the other hand, it plays the role of filling micro powder and reduces the porosity of the castable. This reduces structural defects in the castable, improves its strength and resistance to slag erosion, and improves the overall performance of refractory materials.

                                                  Corundum Castable
                                                  Corundum Castable
                                                  Corundum Mullite Refractory Castable for Sale
                                                  Corundum Mullite Refractory Castable for Sale
                                                  Corundum Silicon Carbide Wear Resistant Refractory Plastic
                                                  Corundum Silicon Carbide Wear Resistant Refractory Plastic

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                                                    Rongsheng Refractory Castable Manufacturer

                                                    As a manufacturer of refractory castables, Rongsheng’s unshaped refractory workshop is equipped with advanced, fully automatic production lines. The annual output of 80,000 tons. According to different kiln types and operating conditions, we configure exclusive monolithic refractory formulations for customers. The types of products we have sold include wear-resistant refractory plastics, corundum castables, corundum mullite castables, refractory mortar, refractory ramming materials, etc. Want to know more about Rongsheng refractory manufacturers, or you need to buy monolithic refractory products. Please contact us, we will provide you with services according to your specific needs.

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                                                      Application of Zirconia Unshaped Refractories in Glass Furnace

                                                      With the continuous improvement and development of the glass furnace structure, the variety and demand of zirconia ramming materials are increasing. Domestic manufacturers of zirconia ramming materials have swarmed, forming a wave of production of zirconia unshaped refractories.

                                                      Zirconia Unshaped Refractories

                                                      Zirconia unshaped refractories can be divided into two categories: zirconia slurry and zirconia ramming material. Zirconia ramming materials are divided into two types: zirconite and zirconia alumina. The former is to add a certain proportion of crushed sintered zircon brick pieces to the zirconia mortar powder to form granular aggregates. The latter is added with granular aggregate after the fused corundum brick is broken. When using the above two ramming materials, add an appropriate amount of industrial phosphoric acid (H3PO4) with a concentration of 85%. After mixing, make the ramming materials wet and loose, and then ramming. After high-temperature sintering, it becomes a solid whole.

                                                      Rongsheng Zirconia Refractory Ramming Mass for Sale
                                                      Rongsheng Zirconia Refractory Ramming Mass for Sale

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                                                        Application of Zirconia Ramming Material in Glass Kiln

                                                        Among different zirconia ramming materials,

                                                        • Some are zirconia ramming materials with aggregates. It is mainly used for the bottom ramming layer in the kiln for melting borosilicate glass.
                                                        • Some are zirconia -alumina ramming materials. It is mainly used to melt the bottom ramming layer of soda-lime-silica glass, electric vacuum glass, and other alkaline glass furnaces.
                                                        • Some belong to zirconia mortar. It is mainly used for mortar joints of zircon bricks or transition layers.
                                                        • Some are intermediate repair materials. It is mainly used for repairing any refractory material that is not in contact with the molten glass in the flame space after corrosion.
                                                        • There is also a mixture of ramming materials and intermediate repair materials.

                                                        Although the above-mentioned zirconia refractories have different uses, different chemical compositions, and various specifications, they are all called ramming mass refractory materials. Therefore, it often creates illusions for users. The manufacturer of Rongsheng refractory castables materials manufacturer reminds all customers that in the construction process, the wrong type should be avoided and the wrong place of the zirconia refractory ramming material should be avoided. So as not to cause the “ramming material” to peel off or be mixed in the glass liquid, causing stones and bubbles in the product. In severe cases, the glass furnace is damaged prematurely.

                                                        Zirconia Refractory Mortar
                                                        Zirconia Refractory Mortar

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                                                          The Curing Mechanism of Zirconia Unshaped Refractories

                                                          Both zirconia ramming material and zirconia refractory mortar use phosphoric acid as a binding curing agent. Both types of powders contain AL2O3. When phosphoric acid (H3PO4) is added, H3PO4 reacts with AL2O3 to form AL(H2PO4)3 at 150°C. ALPO4 is formed at 236℃ and then combined with ZrO2 in zircon sand to generate Zr(H2PO4)4, Zr(HPO4)2, and Zr3(PO4)4. At 300℃~340℃, compounds such as ZrP2O7 are formed to cause bonding and solidify. When the temperature continues to rise to 1520~1550°C, decomposition occurs again to produce (ZrO) 2P2O7+P2O5. Among them, the phosphoric acid is completely volatilized at this temperature, so that the zirconia amorphous refractory material becomes a solid and integral hard block. Therefore, it is necessary to empty the furnace and heat the kiln to make the furnace bottom temperature exceed 1550°C.

                                                          Rongsheng Refractory Materials Manufacturer

                                                          Rongsheng is an experienced refractory manufacturer. Rongsheng’s refractory materials have been recognized by customers in more than 60 countries around the world. For example, Thailand, UAE, Turkey, Kuwait, South Africa, Malaysia, Vietnam, Netherlands, Philippines, Singapore, Egypt, Russia, etc. Rongsheng’s refractories have also served many glass furnace projects. Learn more about zirconia refractory bricks and zirconia unshaped refractory products for glass kilns. Please contact us. We will provide you with services according to your specific needs.

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                                                            Refractory Material for Cement Rotary Kiln Hoods

                                                            For some large rotary kilns, the heat load on the lower part of the Kiln Hoods is relatively high. If the general high alumina castable refractory is not well maintained and temperature rise controlled, they are prone to bursting and falling off. The top of the Kiln Hoods is close to the tertiary air duct, and the dust-laden airflow is relatively serious. Moreover, the construction of the top castable is relatively difficult, and the fluidity and early strength of the material are relatively high. Rongsheng refractory castable cement manufacturer recommends that the Refractory Material for Cement Rotary Kiln Hoods adopts high-strength wear-resistant castables with good high-temperature performance, strong thermal shock resistance, and wear resistance.

                                                            Rotary Kiln Hoods Refractory Lining
                                                            Rotary Kiln Hoods Refractory Lining

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                                                              Why use the same refractory material for cement rotary Kiln Hoods and Coolers?

                                                              The Kiln Hoods is the kiln head part of the rotary kiln, and the cooler is supporting equipment for the rotary kiln. The top of the cooler has a high working temperature and large temperature changes. The low walls on both sides of the front end are long-term abraded by the high-temperature clinker coming down through the kiln mouth and also endured by certain mechanical and thermal stresses. The operating environment of these two parts is similar. Therefore, refractory manufacturers generally recommend the use of refractory materials of the same material. Rongsheng refractory manufacturers generally recommend the use of refractory castables in these two parts.

                                                              Cement Rotary Kiln Cooler Refractory Lining
                                                              Cement Rotary Kiln Cooler Refractory Lining

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                                                                Why should refractory castables be used for kiln hoods and coolers?

                                                                According to the use conditions of the Kiln Hoods and coolers described above, the reasons for the use of refractory castables in the Kiln Hoods and coolers can be roughly summarized.

                                                                1. The refractory castable at the bottom of the kiln hood is subject to the rebound thermal shock of the high-temperature clinker coming down from the kiln mouth. For some large cement kilns, the daily output of the clinker is large, and the heat load on the premises is relatively high.
                                                                2. The top of the Kiln Hoods is close to the tertiary air duct, and the dust flow is relatively serious, and the castable has better wear resistance at high temperatures. Moreover, the construction of the top castable is more difficult, and the fluidity and early strength of the material are relatively high.
                                                                3. The bottom of the front end of the cooler is subject to the rebound thermal shock of the clinker, and the working temperature is relatively high and changes greatly. The low walls on both sides of the front end have been long-term abraded by the high-temperature clinker coming down through the kiln mouth and also endured certain mechanical and thermal stress damage.

                                                                <To sum up> According to the operating characteristics of the above parts of the cement rotary kiln, it is recommended to use high-strength wear-resistant castables with good high-temperature performance, strong thermal shock resistance, and wear resistance.

                                                                Rongsheng refractory material manufacturer provides special kiln hoods refractory castable products for cement kilns. Moreover, Rongsheng manufacturers can adjust the refractory formula of the kiln hoods according to the specific production needs of customers. Let every customer be able to do it in the production process, minimizing costs, and maximizing benefits.

                                                                Cement Rotary Kiln Hoods Refractory Castables
                                                                Cement Rotary Kiln Hoods Refractory Castables

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                                                                  Construction of refractory material for cement rotary Kiln Hoods

                                                                  General refractory construction plan for Kiln Hoods

                                                                  1. Exhaust holes should be left during the construction of the wall castables, and the holes should be drilled with a gas drill with a distance of 300*300mm. And it is embedded with Φ5mm wooden strips, the depth is half of the castable.
                                                                  2. After the pouring hole of the Cement Rotary Kiln Hood is closed, 8 ventilation holes should be reserved and waterproof function should be ensured.

                                                                  Construction scheme of kiln hoods ceiling

                                                                  1. Use hanging anchors. Weld it on the L70*70 angle steel at a distance of 250mm*250mm. The angle steel is welded to the longitudinal I-beam of the original Kiln Hoods steel structure. The angles are arranged at a pitch of 250mm.
                                                                  2. The mold is supported from below. Before supporting the mold, paste F10D aluminum silicate fiber cotton on the vertical surface of the surrounding old castable with high-temperature bonding powder (BP-1).
                                                                  3. When pouring, pouring the castable in the order of ABCDEF. Then paste F10 aluminum silicate fiber cotton on the end surface with high-temperature bonding powder (BP-1).
                                                                  4. During the pouring process, use the H100 calcium silicate board for laying. Or after pouring, use high-strength lightweight heat-insulating castable (HN-1.3 or Q1.3) for complete covering pouring (δ=1000mm).
                                                                  5. After all, pouring is finished, use ordinary steel plate with δ=3mm to cover the surface (pay attention to the waterproof of the lap joint). And cut holes and weld steel pipes to leave several ventilation holes.

                                                                  The technical scheme of brick masonry for kiln door cover vault

                                                                  1. Brick supporting board at the bottom of the arch on both sides of S and N. When the brick supporting board at the bottom of the arch on both sides of S and N burns more than 1/2 the thickness of the brick, the brick supporting board should be replaced in time. Its specifications: 4150mm*330mm*10mm. If time permits, remove the old board before welding. If time is tight, weld directly on the original pallet. The fixed three sides are required to be fully welded and the working surface is flat.
                                                                  2. Refractory brick masonry. The vault has a total of 17 rings of refractory bricks, which are built with the refractory mortar, and the mortar joint is controlled at 1mm. Before laying, the line must be laid out, three in the axial direction, three in the circumferential direction, and four in the circumferential direction. The masonry of refractory bricks must be based on this line.

                                                                  Masonry of insulation bricks

                                                                  1. Build a layer of 114mm thick insulation brick on the above refractory bricks, using insulation refractory mortar. There are 3 models (230*114*55/65mm or (60/65 or 65/65)) to match and concentrically build with refractory bricks.
                                                                  2. The masonry of insulation bricks should be synchronized with refractory bricks. The upper gap is filled with aluminum silicate fiber cotton to facilitate the wedging of the rear refractory bricks.
                                                                  RS Cment Rotary Kiln Burner Refractory Castable for Sale
                                                                  RS Cement Rotary Kiln Burner Refractory Castable for Sale

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                                                                    Rongsheng Refractory Castable Manufacturer

                                                                    Rongsheng is an advanced refractory castable manufacturer with a fully automatic and environmentally friendly refractory castable production line with an annual output of 80,000 tons. Has served customers in more than 60 countries and regions, for example, India, Pakistan, Kuwait, South Africa, Malaysia, Vietnam, Netherlands, Philippines, Singapore, Egypt, Russia, etc. Rongsheng has customized kiln hoods’ refractory castables, burner refractory castables, high-alumina high-strength refractory castables, and high-strength wear-resistant castables for cement rotary kilns. The product quality and customer service of Rongsheng’s unshaped refractories are leading in the industry. Get more product quotations on refractory material for cement rotary kiln hoods. Please leave your contact information and specific requirements on our website page. We will provide you with refractory materials that best suit your production needs according to your actual working conditions. Save production costs and improve economic efficiency.

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                                                                      Application of Low Cement Castable in Soaking Furnace

                                                                      Low cement castable refers to a castable with low cement content. The cement dosage of refractory cement castables is generally 15% to 20%, and the cement dosage of low cement castables is about 5%, and some even reduce to 1% to 2%. Application of Low Cement Castable. The purpose of reducing the amount of cement is to improve the fire resistance of the castable. After molding and curing, less cement hydrate is formed. During heating and baking, there is no problem that a large number of hydration bonds are destroyed and the medium temperature strength is reduced. Instead, as the heat treatment temperature increases, it gradually sinters and the strength gradually increases. The water requirement of the castable is greatly reduced, so the porosity is low and the volume density is high. From the refractory castables manufacturer, it is very suitable for all kinds of heating furnaces and soaking furnace refractory lining materials.

                                                                      Low Cement Castable Refractory Material
                                                                      Low Cement Castable Refractory Material

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                                                                        Construction of Low Cement Castable on Soaking Furnace

                                                                        Low cement castables and ordinary castables are both refractory castables combined with calcium hard aluminate cement, which are widely used in thermal equipment in metallurgy, petroleum, chemical, and other industries, and have achieved good results. In the overall pouring of the soaking furnace, the installation of anchoring bricks, the retention of expansion joints, and the 20 Pa pressure operation of baking below 200 ℃ for 4 days are the key points.

                                                                        When low-cement castable is cast as a whole, it is poured layer by layer from the bottom of the furnace wall up. Take the height of two anchor bricks as one layer, paste ceramic fiber felt, build light clay bricks, and support the template. The mixed low cement castable can be poured into the formwork through the funnel. Flatten and shake with a vibrating rod, which is very important. Whenever it is poured to the horizontal position of the anchor brick, it is best to be 20 mm higher than it. Then the anchor bricks are kneaded, squeezed, and hung by hand so that they are stably placed on the required horizontal position. When pouring to the furnace mouth, spread two layers of oil felt paper to ensure easy removal during intermediate repairs. It can be demoulded 2 days after pouring.

                                                                        Construction of Low Cement Castable
                                                                        Construction of Low Cement Castable

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                                                                          Hardening Mechanism of Low Cement Castable

                                                                          Low cement castables rely on the addition of several special raw materials to obtain good performance. In the Application of Low Cement Castable, First, pure calcium aluminate cement, due to the high content of effective mineral CaO·Al2O3, can obtain the required strength with less mixing. The second silica fume is glass beads with a SiO2 content between 93% and 98% and an average particle size of about 0.5 μm. After adding silica fume, the castable has good fluidity, low molding water requirement, and low sintering temperature, which improves the performance after heat treatment. Third, alumina powder is easier to participate in the reaction and improve the fire resistance of the material. Fourth, the water reducing agent, which can be adsorbed on the surface of the powder, and then generate electrostatic repulsion to disperse the powder, so as to further play the role of fine powder.

                                                                          Oven-drying after Casting Low Cement Castable

                                                                          The oven-drying is an important part that directly affects the service life of the soaking pit of the low cement castable. During the Application of Low Cement Castable, they contain ultrafine oxide powders, so they have the weaknesses of poor air permeability and poor chipping resistance. Cracking is a phenomenon produced when the internal steam pressure of the castable increases beyond its strength during the drying period. It is closely related to the diffusion rate of steam, that is, the air permeability of the pouring body. For this reason, the oven-drying curve should be controlled within 200°C in the first 4 days, and the temperature should be lower at the beginning, and the oven-drying should be operated with slight positive pressure. The practice has proved that this method effectively overcomes the cracking and lays an extremely favorable foundation for the subsequent heating of the oven-drying.

                                                                          Low Cement Wear Resistant Castable
                                                                          Rongsheng Low Cement Wear Resistant Castable for Sale

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                                                                            The Effect of Using Low Cement Castable

                                                                            Since the first furnace pit was poured, more than 2,400 tons of low cement castables have been successfully used. From construction, oven-drying to formal production, low-cement castables have the characteristics of good pressure resistance, high flexural strength, good high-temperature volume stability, and good thermal shock stability at low, medium, and high temperatures. The average life of each furnace pit is more than 3 years. Practice shows that low cement castables are good materials for soaking furnace pits. For more information, please contact rs low cement castable manufacturers.

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                                                                              Advantages and Applications of Lightweight Insulating Castables

                                                                              Lightweight insulation castables are composed of high-quality, high-strength raw materials, aggregates and ultra-fine powders, and compound additives. Because the light-weight insulation castable is a powdery and granular refractory material made of certain refractory materials such as alumina and some binders. It has high fluidity and is mainly formed by pouring in construction. Lightweight insulating castables have the advantages of high strength, small volume density, low thermal conductivity, good insulation performance, and convenient construction. It is an ideal choice for industrial boiler insulation materials.

                                                                              Lightweight Insulation Refractory Castable

                                                                              RS Lightweight Insulating Castable for Sale
                                                                              RS Lightweight Insulating Castable for Sale

                                                                              Construction method: vibration or manual ramming construction.

                                                                              Main function: Insulation and heat insulation to reduce the external temperature of the furnace wall.

                                                                              Q: How to mix light-weight insulation castable?

                                                                              A: The mixing of castables requires the use of forced mixers and special mixers.

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                                                                                Advantages of Lightweight Insulating Castable

                                                                                The light-weight castable insulation is made of aluminate cement, high-alumina fine material, ceramsite, plus several additives. It has the advantages of high refractoriness, high strength, and low thermal conductivity. The heat preservation casting material of the invention has the characteristics of low thermal conductivity and small volume density, which can reduce the heat and heat energy consumption of industrial kilns and reduce the weight of the furnace lining. In the high-temperature light-weight insulating castable, the raw material of the high-temperature light-weight castable that can be used above 1200°C is a porous material. Mullite, corundum, high aluminum, siliceous and magnesia and other porous clinker or light refractory brick. This castable can be directly used in the lining of 1350℃ atmosphere furnace.

                                                                                Insulating castable supplier
                                                                                RS Insulating Castables Supplier

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                                                                                  Lightweight thermal insulation castable has the following advantages:

                                                                                  1. The high-temperature resistance and high strength.
                                                                                  2. Low thermal conductivity.
                                                                                  3. The small volume density, reduce kiln heat consumption.
                                                                                  4. Convenient construction and reduce labor intensity.
                                                                                  5. Light texture, reduce the weight of kiln lining.
                                                                                  6. resistant to acid and acid gas corrosion.
                                                                                  7. Characteristics of heat insulation, heat preservation, and low water absorption.

                                                                                  In addition, the lightweight insulating refractory castable is not only easy to construct but also the most ideal product for construction with alkali-resistant parts at high temperatures. Moreover, the workability is good, the bonding force is strong, and the initial setting time and the construction operable time are long. The strength increases quickly, the impermeability is strong, no acidification treatment is needed, and it is easy to ensure the denseness and fullness of the masonry gray joints. Can significantly improve the airtightness, integrity, and anti-corrosion ability of the chimney lining wall. It is an ideal cementing material for a high chimney, high-temperature flue, and air duct lining.

                                                                                  The Use of Light-weight Insulation Castable

                                                                                  It is suitable for unshaped refractory materials formed by pouring. It is easy to ensure the denseness and fullness of the masonry gray joints, which can significantly improve the airtightness, integrity, and corrosion resistance of the chimney lining wall. It is suitable for a high chimney, high-temperature flue, and air duct lining. Lightweight insulating castables are mainly used for lining thermal insulation devices such as high-temperature industrial kiln insulation. It can also be used in acid-resistant projects such as acid-resistant tanks and tanks in petroleum, chemical, nonferrous metallurgy, and other industries.

                                                                                  Mullite Insulating Castable
                                                                                  Mullite Insulating Castable

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                                                                                    Lightweight Insulating Castables Manufacturer

                                                                                    Rongsheng refractory castable manufacturer has an annual output of 80,000 tons’ production workshop. As a manufacturer of high-quality refractory castables, the light-weight heat-insulating castables produced have the advantages of moderate strength and good insulation performance. Lightweight insulating castable is made of aluminate cement, high-alumina fine material, ceramsite, and some additives. Lightweight insulating castables have the characteristics of lightweight, high compressive strength, acid and acid gas corrosion resistance, heat insulation, heat preservation, and low count rate. In addition, Rongsheng’s acid-resistant bricks, acid-resistant clay and wipe fabrics, acid-resistant bricks, acid-resistant clay, and wipe fabrics are self-developed refractory materials suitable for thermal insulation of power plant boiler chimneys and heating network pipes. They have the characteristics of acid corrosion resistance, temperature resistance, heat resistance stability, and convenient construction.

                                                                                    Get the refractory castable service from Rongsheng, please leave your specific needs in the message box on our page, we will reply to you in the shortest time.

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                                                                                      Lightweight Refractory Castable Preparation

                                                                                      Lightweight castable is mainly made of aluminate cement, high alumina fine material, ceramsite and other additives. Lightweight refractory castable sales with light volume, high compressive strength, acid and acid gas corrosion resistance, heat insulation, heat preservation, low water absorption characteristics.

                                                                                      The series of refractory insulation castable is composed of lightweight refractory aggregate and powder, and the binder admixture is called lightweight castable. Lightweight refractory castable sales are mainly used in high chimney, high temperature flue and air duct lining, petroleum, chemical, nonferrous metallurgy and other industries acid tank, tank and other acid resistant engineering.

                                                                                       

                                                                                      Lightweight refractory castable sales
                                                                                      Lightweight refractory castable sales

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                                                                                        The type and amount of cement, refractory powder and light aggregate used in lightweight castable refractory are not the same, so are their functions. The reduction of water consumption and the improvement of strength with the addition of water-reducing agent are remarkable. The addition with small bulk density can reduce the volume density of castable and improve its heat insulation function, but the strength is reduced twice, and the more the dosage is, the more significant it is. Therefore, according to the working conditions of the furnace and the position of castable, the reasonable selection of lightweight refractory castable can achieve the intention of energy saving.

                                                                                        The manufacturing and molding of lightweight refractory castables are essentially the same as refractory castables. The difference is that the bulk weight of light aggregate is small, easy to absorb water, so the weight of light aggregate should be weighed, poured into the forced mixer, first add half of the water, wet mixed evenly, then add refractory powder and cement, and add the rest of the water mixing. When forming, aggregate is easy to float up, forming layers, so the vibration time to be shorter, should be controlled. Lightweight refractory castable sales shall be maintained in a wet environment after initial setting in accordance with a professional process. 1 day after the removal of mold, Portland cement and CA-50 cement lightweight refractory castable samples, should be maintained for 6 days and 2 days. Then, check its functionality. The drying compressive strength is greater than 6Mpa. With the increase of heating temperature, the strength decreases. When it reaches 1300℃, the strength increases, which is caused by the sintering of powder.

                                                                                        This series of refractory castable is easy to construct and is the most ideal product for alkali resistant parts at high temperature. Mainly according to the porosity, binder, aggregate classification. In practice, it is often classified by the use of temperature or functional characteristics. According to the porosity, there are two kinds of dense castable material and insulation burning material with the porosity not less than 45%. According to the binder there are hydraulic binding, chemical binding, coagulated binding castable. There are clay aggregate, high alumina aggregate, silicon aggregate, alkaline aggregate, special aggregate and insulation aggregate.

                                                                                         

                                                                                        Lightweight refractory castable for sale
                                                                                        Lightweight refractory castable for sale

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                                                                                          Zhengzhou Rongsheng Kiln Refractory Co.,Ltd. is professional refractory castable manufacturer. Over the years, we are committed to the production of high-quality refractory materials, and more than 60 countries and regions reached friendly relations of cooperation with customers. Refractory products stable quality, complete varieties, worthy of customer trust, welcome to purchase, we will serve you wholeheartedly.

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