High-alumina bricks are aluminosilicate refractory materials with an Al2O3 content of over 48% by mass. Due to their high alumina content, they are called high-alumina refractory materials. They can be classified according to their mineral content as follows: Mullite-silica bricks, with an Al2O3 content of 40%~70%. Mullite-corundum bricks, with an Al2O3 content of 79%~95%. Corundum bricks , with an Al2O3 content of 95%~100%. They can also be classified according to Al2O3 con