Sintered high alumina bricks are the main members of the family of aluminosilicate refractories. According to the content of alumina, aluminum silicate materials are divided into the following four categories.
①Semi-siliceous refractory material: alumina content is 15%~30%.
②Clay refractories: the alumina content is 30%~48%.
③High alumina refractory material: alumina content is 48%~89%.
④Corundum refractory material: alumina content is greater than or equal to 90%.

In general, the physical and chemical properties of high-alumina refractories are determined by their Al2O3/SiO2 ratio, impurity content, the density of raw materials, the particle size distribution of bricks, type and amount of binder, as well as mixing, molding, and sintering conditions. . For special high-alumina bricks, the type, grade, particle size and content of special refractory raw materials added to determine the mineral composition, microstructure and damage mechanism of the refractory material, and affect the physical and chemical properties and use effect of the refractory material.

Ordinary high alumina bricks have good high temperature resistance, but poor thermal shock resistance. In the 1970s, China Academy of Building Materials developed phosphate-bonded high-alumina bricks (hereinafter referred to as phosphate bricks), which solved the problem of poor thermal shock resistance of high-alumina bricks. However, the high temperature resistance of phosphoric acid bricks is not good. In the future, the development of materials with high temperature resistance and thermal shock resistance has become the development direction of high-alumina refractory materials.

In the 1980s, the China Academy of Building Materials used the method of adding zircon to develop anti-stripping high-alumina bricks. Later, China Academy of Building Materials developed light-fired high-alumina bricks by reducing the amount of phosphoric acid and adding "three stones". Luoyang Refractory Research Institute has developed kyanite bricks by firing at high temperature and adding "three stones". In the 1990s, the China Academy of Building Materials developed the second-generation anti-stripping bricks, and some refractory companies also developed silicon carbide bricks by adding silicon carbide. At present, the sintered high-alumina bricks used in cement kilns have formed a situation dominated by silica molybdenum bricks and anti-stripping bricks. In particular, it should be pointed out that anti-peeling bricks and silica molybdenum bricks are new products independently invented by Chinese refractory technicians.