Low Cement Refractory Castable Preparation

Low cement refractory castables preparation process requirements are very strict, so there are many factors affecting the performance, mainly ultrafine powder, aluminate cement, refractory aggregate and admixture. Refractory aggregate and water consumption are also important factors.

 

Low cement refractory castables
Low cement refractory castables

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    First of all, we know that the role of ultrafine powder on low cement refractory castable determines the performance of low cement series refractory castable pillar, it is no exaggeration to say, no ultrafine powder, there is no low cement series refractory castable. In low cement refractory castable, ultrafine powder plays the role of dispersing accelerator and structure compacting agent. The former makes the cement particles highly dispersed without flocculation, while the latter makes the microstructure micropores fully filled to enhance the strength. Ultrafine powder types include SiO2, a-al2o3, Cr2O3, ZrO2 and MgO. The specific surface area of SiO2 ultrafine powder is about 20m2/g, and its ergodic length is about 1/100 of that of cement particles, so it has good dispersion and filling property. With the increase of SiO2 ultrafine powder dosage, the strength increases and the fireproof decreases, and the appropriate dosage is ≥3%.

    Aluminate cement variety, variety is different, the preparation of low cement refractory castables performance is also different. For example, when the mixture ratio and process conditions are basically the same, the dosage of ca-50 cement and ca-70 cement are 5%, and the compressive strength after drying, firing at 800℃ and 1100℃, respectively, the former is 45Mpa, 51Mpa and 59mpa, while the latter is 65, 70 and 74mpa respectively. This indicates that the performance of the low-cement refractory castable prepared by ca-70 cement is better than that of the low-cement castable prepared by ca-50 cement, but the cost is slightly higher.

    The basic fit of castable remains unchanged, and the amount of refractory powder and cement is constant. The minimum amount of cement shall ensure sufficient strength at room temperature to meet the technical requirements of mold removal or hoisting of low cement refractory castables. The normal temperature compressive strength of this series of refractory castable is 15Mpa and 22Mpa respectively. Before 1100℃, the amount of cement is large, and the compressive strength after burning is high. At 1400℃ and 1500℃, the two are basically similar, and the amount of cement is slightly higher.

     

    Low cement refractory castable
    Low cement refractory castable

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      Finally, we are a professional refractory castable manufacturers, the production of a variety of unshaped refractories, full range of products, can be customized, welcome to consult.

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        Low Cement Refractory Castable Factory

        Our factory product low cement refractory castables is made of high quality aluminum aggregate, powder and high efficiency binder. With high temperature resistance, erosion resistance, peeling resistance, thermal shock stability, set most of the advantages of refractory castable in one. It also has the characteristics of high density, low porosity, high strength, low wear, heat shock and corrosion resistance.

         

        Low cement refractory castables
        Low cement refractory castables

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          Low cement refractory castable has a use good effect. Widely used in large cement kiln decomposition furnace, kiln door hood, rising flue, cooling machine, such as high temperature, alkali corrosion and other parts. The binder commonly used for low cement castable is aluminate cement, and the amount of cement can affect the overall service performance, high temperature strength, corrosion resistance of the castable.

          Generally speaking, aluminate cement as the binder of refractory castable, CaO content less than 2.5%, can be referred to as low cement refractory castables. A castable with a CaO content of 1.0-2.5% May be called an ultra-low cement castable. Low cement castable is a kind of high-grade refractory castable, because the CaO content in cement is low, so called low cement castable.

          Low cement refractory castables is mainly used in heating furnace, various heat treatment furnace, electric furnace cover, shaft kiln, rotary kiln, blast furnace outlet, ladle, ladle and other lining. This series of refractory castable is in the production process, through the adjustment of the formula, reduce the CaO content, improve the overall performance of low cement castable, increase the service life of the lining.

          Compared with ordinary refractory castables, this castable has the advantages of less water consumption, low porosity, moderate temperature strength, good resistance to spalling and erosion. Has been successfully used in power plant boiler, petrochemical, steel industry heating furnace.

           

          Low cement refractory castable price
          Low cement refractory castable price

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            Zhengzhou Rongsheng Kiln Refractory Co.,Ltd. is professional low cement refractory castables manufacturer, production of various refractory materials more than 200 kinds, export more than 60 countries and regions, welcome to consult and purchase. We will provide you with quality, comprehensive and considerate service.

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