High-alumina bricks usually refer to refractory bricks with Al2O3 content > 48%, mainly using natural high-grade bauxite clinker as raw material, adding soft or semi-soft clay as a binder to form mud, and then molding and drying. , and finally fired. Raw material selection—powder preparation (crushing, pulverizing, screening)—proportioning ingredients—mixing—pimaking forming—drying—sintering—inspection—packaging. The refractoriness of high alumina brick is about 1770℃, and the softening temperature under load is 1420℃-1550℃.

Classification of high alumina bricks:

①According to the content of Al2O3, it is divided into: super high alumina bricks (AL2O3>80%); first grade high alumina bricks (Al2O3>75%); second grade high alumina bricks (Al2O3 at 60%-75%); third grade high alumina bricks (Al2O3 at 48%-60%).

② According to the firing process, it is divided into: fired high-alumina bricks and non-fired high-alumina bricks. The firing temperature of the first and second grade high-alumina bricks is 1500℃-1600℃, and the firing temperature of the third-grade high-alumina bricks is 1450℃-1500℃. Unfired high-alumina bricks mainly refer to phosphate high-alumina bricks.

③ According to the mineral composition, it is divided into five types: low mullite, mullite, mullite-corundum, corundum mullite and corundum.

④ According to the shape, it is divided into: standard high-alumina bricks, special-shaped high-alumina bricks and special-shaped high-alumina bricks.

⑤ According to the characteristics, it is divided into: ordinary high-alumina bricks and special high-alumina bricks (thermal shock resistance, low creep, anti-stripping high-alumina bricks)

⑥ According to the use, it is divided into: high-alumina high-alumina bricks, hot blast stove high-alumina bricks, steel-making electric furnace roof high-alumina bricks, Shenggang barrel high-alumina bricks, and Shenggang barrels high-alumina bricks for casting.