1400C 1690C 1770c Alumina Bricks Refractory High Alumina Brick 70% 75% Al2O3 Used Fire Roof High Alumina Fire Brick Factory

Overview of high alumina brick

High alumina bricks are silicon-aluminum-based refractory materials with an alumina content of ≥ 48%. They possess high strength, high temperature resistance (1750 - 1790℃), and resistance to erosion, and are widely used as inner linings in high-temperature industrial kilns such as those in metallurgy and ceramics.

The core definition and classification of high-alumina bricks

High alumina bricks are refractory bricks made by high-temperature sintering of high-alumina raw materials (such as bauxite). Their main components are alumina (Al₂O₃) and aluminum silicate. They are classified into four grades based on the content of alumina.

1.Super high alumina brick; Alumina content > 80% - used for critical high-temperature parts (such as the top of an electric furnace)
2.First-grade high alumina brick, alumina content 75%-80% - used for the lining of blast furnaces and hot air furnaces
3.Second-grade high alumina brick: alumina content 65%-75% - used for rotary kilns and reflector furnaces
4.Third-grade high alumina brick: alumina content 55%-60% - generally used for the walls of industrial kilns

Key performance indicators of high-alumina bricks

1.High-temperature resistance: Fire resistance range of 1750 - 1790℃, softening temperature under load of 1420 - 1550℃. Superior to clay bricks but inferior to silica bricks.
2.Physical properties: High compressive strength at room temperature, low apparent porosity (usually < 22%), strong resistance to acidic slag erosion, weak resistance to alkaline slag.
3.Thermal stability: Decreases with the increase of alumina content. Generally, water-cooled circulation is only 3 - 5 times.

Application fields and production processes

Main applications: metallurgy (blast furnaces, converters), ceramics (kiln linings), chemical industry (catalytic cracking furnaces), etc. for high-temperature equipment .
Production process: raw material grinding → mixing and molding → drying → high-temperature sintering (dry method or semi-dry method, semi-dry method can increase the density of the body).

Case of Cooperation with Lite High-Aluminum Bricks

Henan Lite Refractory Materials Co., Ltd. has served over 5,000 projects and has been dedicated to the production and research and development of refractory materials for 30 years. It possesses professional technology and a mature team. Its products have been exported to various markets around the world and it is a highly renowned enterprise. Moreover, it has overseas warehouses, which facilitate rapid delivery and ensure product reliability.

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High alumina bricks are refractory bricks made by high-temperature sintering of high-alumina raw materials (such as bauxite). Their main components are alumina (Al₂O₃) and aluminum silicate. They are classified into four grades based on the content of alumina.