Low Cement Castable

Low cement refractory castables refer to low cement refractory castables of aluminum silicate, magnesium and silicon. Among them, aluminum silicate low cement refractory castables are the earliest developed, most deeply researched and most widely used.

The formulation principle of low cement refractory castables is to reasonably select particle grading, ultrafine powder and admixture types and their dosage.

The refractory aggregates and powders of low cement refractory castables are made of well-calcined clay clinker and high alumina clinker. The maximum particle size of refractory aggregates is determined according to the thickness of the engineering lining, generally 10 μm. Its particle grading: 10~0.15 mm. Generally speaking, when preparing low cement refractory castables, four levels of particle grading are used to achieve the maximum packing density.

Low cement refractory castables generally use secondary, primary or special grade high alumina clinker as raw materials. After grinding, iron removal should be carried out, and the fineness <0.09mm or <0.044mm should be ≥90%. When preparing, it can be used alone or in proportion. Sometimes high-grade materials such as alumina powder, white corundum powder or brown corundum powder of the same fineness are added to improve the matrix performance of low cement refractory castables.