Acid Resistant Castable

LJFS series of wear-resistant, fire-resistant and acid-resistant castables are developed by our company based on the operating conditions and technical requirements of circulating fluidized bed waste incinerators. They are suitable for waste incinerators. The main features of this series of products are: high temperature resistance, corrosion resistance, erosion resistance, and high thermal shock stability and crack resistance.

Alkali-resistant castable refractories

Castable refractory materials that can resist corrosion by alkali metal oxides (such as K2O and Na2O) (see refractory castables). It is a mixture of refractory aggregate, powder, binder and alkali-resistant powder. Alkali-resistant refractory castables are divided into light and heavy. Light alkali-resistant refractory castables have a porosity greater than 45%; heavy alkali-resistant refractory castables have a porosity less than 45%.

Composition and performance The aggregates used in lightweight alkali-resistant refractory castables include alkali-resistant ceramsite, clay porous clinker, waste porcelain material, high-strength expanded perlite, etc. The binder is calcium aluminate cement or water glass. Alkali-resistant powder can be made of high-silica refractory materials, which react with alkali metal oxides at high temperatures to generate high-viscosity liquid products, forming a glazed protective layer to prevent the penetration and erosion of alkali metal melts. The chemical composition of lightweight alkali-resistant refractory castables is generally: Al2O330%~55%, SiO225%~45%. The cement dosage of traditional alkali-resistant castables is 25%~30%, and the water dosage is 20%~25%. Due to the destruction of cement bonding structure at medium temperature (800~1100℃), its strength is greatly reduced to only about 50% of the drying strength. Therefore, ultrafine powder and suitable dispersant can be introduced to reduce the cement dosage to 10%~20% and the water dosage to 15%~20%.