Low Cement Refractory Castable for Cement Kiln Lining

With the continuous progress of the production and use technology of monolithic refractories, especially the development of low-cement refractory castables, self-flowing castables, and wet injection technology. The refractory lining used in the new dry-process cement kiln system has gradually developed into a castable-based lining structure.

Refractory Materials in Cement Kiln
Refractory Materials in Cement Kiln

Multifunctional refractory castables have many functions such as high early strength, high thermal strength, alkali resistance, wear resistance, and heat insulation. For the vulnerable parts in the new dry process cement kiln system. Such as the kiln mouth, the top of the kiln door cover and the blanking slope, the low wall of the grate cooler, and the high-temperature area on the top of the grate cooler. Coal injection pipe, tertiary air pipe elbow, and other parts. Various refractory castables have different damage mechanisms under different conditions of use parts. Because the vulnerable parts in the new dry-process cement kiln system are in harsh environments such as high temperature, cement clinker erosion, abrasion, rapid cooling, rapid heating, etc. And it is located in special parts of the port, and the service cycle of these parts seriously restricts the life of the kiln lining of the whole kiln. According to the specific use characteristics of each part of the kiln, the development trend of refractory castables for the cement industry is as follows.

  1. Improve the wear resistance of wear-resistant castables.
  2. Improve the thermal shock resistance of wear-resistant castables.
  3. Reduce Fe2O3 content.
  4. Reduce the bulk density of the castable. Reducing the load on the equipment Reduce the bulk density of the castable on the premise of ensuring wear resistance and thermal shock resistance.
Rongsheng Low Cement Castable Materials
Rongsheng Low Cement Castable Materials

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    Low Cement Refractory Castable for Cement Kiln Lining

    Low cement refractory castables for cement kilns mainly include high alumina, mullite, and corundum refractory castables. This series of products has the characteristics of high strength, erosion resistance, wear resistance, and excellent performance. At the same time, the material can be made into a quick-baking explosion-proof castable according to the user’s baking time requirements.

    Rongsheng monolithic refractory castables are the first to produce low-cement products with reliable quality and stable performance. It is widely used in blast furnace tap ditch, cast iron furnace tap trough, integral powder spray gun for molten iron pretreatment, high-temperature burner lining, heating furnace water cooling tube wrapping lining, etc.

    Corundum and chromium-containing corundum low-cement castables are used for the lining of some parts of the refining device outside the molten steel furnace. It is also used in the lining of power frequency induction furnaces, the high-temperature wear-resistant lining of the petrochemical catalytic cracking reactor, etc. The low-cement refractory castable has the properties of high strength, alkali resistance, and wear resistance, which is obvious to all who have used it.

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

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      Index of low cement refractory castable for cement kiln

      There are three common low-cement refractory castables, where low refers to less cement content in the product. The cement content of castables is as high as 10-30%, and the cement content of low-cement castables is between 3%-8%, so there are also 1% of ultra-low cement castables.

      How to cure and bake low cement castable in the rotary kiln?

      Low cement castables are widely used in new dry process cement rotary kilns. It is mainly used in the rear kiln mouth, kiln door, decomposition furnace, cooler and other parts. As we all know, the construction of refractory castable is mainly composed of three links, namely mixing, pouring, and curing. So how to maintain and bake it?

      1. Maintenance

      The tools that low-cement castables need to use in the curing process are polyethylene plastic film, straw bags, etc.

      Ambient temperature requirements and controls. The curing temperature of the casting body is preferably between 15-35 ℃. Outside this temperature range, corresponding heating or cooling measures should be taken. Otherwise, the performance of the product will be degraded.

      conservation. After the castable is hardened, the surface of the construction body must be covered with polyethylene plastic film immediately. A wet straw bag is added on top to prevent water evaporation and promote cement activation. After hardening, it is forbidden to beat and vibrate within one day. According to the hardening situation, the mold can be removed after 24-30 hours of hardening, or it can be removed in 3 days. After de-molding, continue curing for 2 days. Continue to cover with polyethylene film and wet straw bags during maintenance. After 3 days of curing, remove the polyethylene plastic film and a wet straw bag. Let the cast body dry naturally in the air for 1 day before baking.

      1. Baking

      One of the most critical aspects when using castables during baking. Because the casting body is relatively thick and dense, the water is not easy to discharge. Therefore, it is absolutely forbidden to heat up too fast during baking, otherwise, it will cause the casting body to crack.

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        Low Cement Castable For Sale

        The low cement castable price is reasonable, the production process and the burden requirement are relatively strict, many factors can affect its performance. The following small make up to introduce the characteristics of low cement castable, and what factors affect the performance of low cement castable.

        This series of refractory castable is a kind of refractory material, which can meet the requirements of high temperature kiln.  As a result, it has the characteristics of high density, high strength and so on. Low cement castable price preferential, welcome to consult the purchase.

         

        Low cement castable price
        Low cement castable price

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          Characteristics Of Low Cement Castable

          1. The outstanding feature of low cement refractory castable is density and high strength, which brings benefits for use. But brought trouble to bake, bake namely improper, easy occurrence flaking or blast crack phenomenon. As a result, it is very important to make a reasonable oven curve and to use excellent explosion-proof admixture, so as to make refractory castable molding weight of water.

          2. Low cement castable is a kind of high technology refractory developed on ordinary refractory castable by using rheological principle, most compact packing theory and ultrafine powder technology. For instance, It has the characteristics of low porosity, small pore size, high density, good volume stability, high strength and small amount of water.  And overcome the ordinary castable strength at 800 ~ 1200℃ significantly decreased characteristics.

          3. Different from ordinary refractory castable is low cement, ultra-low cement castable is to use and castable main material chemical composition is the same, or similar to the ultrafine powder to replace part or most of calcium aluminate cement, while adding trace dispersant (water reducer) and a certain amount of delayed coagulant. For instance, the cement-free castable is completely made of ultrafine powder or oxide sol.

           

          Low cement castables
          Low cement castables

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            We are a high quality manufacturer of refractory castables and refractory cement, specializing in the production of all kinds of refractory castables, products sold all over the world. Low cement castable price reasonable, stable and reliable quality, you are welcome to come and buy.

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