Generally, refractory castables with Al2O3 content greater than 90% are regarded as corundum refractory castables, and their main phases are corundum.Because corundum has the characteristics of high melting point and strong slag erosion resistance, the gang-jade castable has high refractoriness and good chemical stability. Corundum refractory material combinations come in many forms, such as:

(1)White corundum is used as aggregate and powder

(2)Tabular alumina and dense alumina were used as aggregate and dense alumina as powder

(3)Subwhite corundum or brown corundum is used as aggregate and dense alumina is used as powder

(4)White corundum and super grade bauxite clinker as aggregate, white corundum as powder, etc

In order to improve the performance of refractory castable matrix, white corundum powder or tabular alumina powder is usually used as its powder. According to the requirement of target performance of corundum refractory castable, reasonable selection of particle distribution coefficient as the formula fitting particle ratio. The active filler in the system is generally used SiO2 powder or active α-al2o3 powder.

According to the application requirements, the rigid jade refractory castable can generally be prepared according to the composition with or without cement. The former uses cement or cement combined with active ultrafine powder as a binder, while the latter uses active ultrafine powder as a binder. At the same time, high effective surfactant was added to disperse the binder and active filler and reduce water consumption.

Generally speaking, the content of powder + active filler in hardened jade refract