Ladle Permanent Layer Castable

Casables for permanent layer of ladle have the following advantages: good fluidity, suitable solidification time; labor-saving, quick and convenient; high strength, long service life; good thermal insulation performance, high temperature resistance, corrosion resistance and thermal shock resistance.

Casables for permanent layer of ladle are calcium aluminate phases with the highest Al₂O₃ content in the CaO-Al₂O₃ system. Their melting point is 1875℃, their thermal expansion coefficient is 8.0×10-6℃⁻¹, their particle volume density is 2.70g·cm⁻³, and their apparent porosity is 26.8%. The refractory performance of this material is similar to that of plate-like corundum, while its thermal conductivity is only 1/3 of that of corundum. It is a new type of high-quality thermal insulation raw material that has emerged in recent years. CA6 castable uses CA6 as aggregate, and the matrix is ​​made of plate-like corundum fine powder, alumina powder and calcium aluminate cement as binders. The volume density of spherical lightweight mullite particles is 1.59g·cm⁻³, and the apparent porosity is 38.9%. Lightweight mullite castables use microporous M70 spherical lightweight mullite balls as aggregates, and the matrix part is made of plate-shaped corundum fine powder, alumina powder and calcium aluminate cement as binders to ensure good resistance to slag erosion and improve the safety of the permanent layer.