Classification of Lightweight refractory castables
According to the application field, lightweight refractory castables can be generally divided into - mullite lightweight castables used in aluminum melting furnace cover, furnace door, lining of fire hole door, and furnace top of heating furnace, used in chimney flue of power plant boiler Acid-resistant lightweight castables, aluminum oxide hollow ball lightweight castables for laboratory high-temperature electric furnace doors, and high-alumina lightweight castables for various industrial kilns, etc.
Mullite lightweight refractory castables is made by mixing porous mullite aggregate and pure calcium aluminate cement. It has the characteristics of high strength, low thermal conductivity, and small bulk density. It can be directly used for the work of atmosphere furnaces. Lining, the use temperature is not lower than 1350 ℃.
Acid-resistant lightweight refractory castables is made of ceramsite, bauxite cement, high-alumina fine powder and other raw materials through mixing. It has the characteristics of high strength, acid resistance and acid gas corrosion, and the service temperature is below 1200 °C.
Alumina hollow sphere lightweight refractory castables are made by mixing alumina hollow spheres and pure calcium aluminate cement as the main raw materials. Insulation material for inner lining and ultra-high temperature kiln.
High-alumina lightweight refractory castables are made by mixing lightweight high-alumina aggregates, bauxite clinker fine powder, and high-alumina cement as the main raw materials. They have large specific surface area, high room temperature strength, and good thermal shock resistance. , High temperature resistance, chemical corrosion resistance, good filtration and adsorption performance and so on.
