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Applications of High-Alumina Bricks
In high-temperature industries like steel, cement, and ceramics, a key material silently endures the test of intense fire: high-alumina bricks. Made primarily from bauxite and sintered at high temperatures, they are named for their Al₂O₃ content exceeding 48%. With their exceptional high-temperature resistance, high strength, and corrosion resistance, high-alumina bricks have become the “refractory backbone” supporting high-temperature industrial production, with applications spanning multiple key processes from raw material smelting to finished product processing.
The steel industry is its primary application area.
In blast furnace ironmaking, high-alumina bricks withstand temperatures exceeding 1500°C and slag corrosion, and are used in key areas such as the upper and middle sections of the furnace shaft. They can withstand hot air blasts exceeding 1300°C in hot blast furnaces, contributing to energy savings and consumption reduction. They are also commonly used in converter and electric arc furnace lining repairs and ladle linings to ensure stable smelting.
Rotary kilns in the cement industry are another important application.
High-alumina bricks, with their high refractoriness under load and wear resistance, are ideal linings for the firing and transition zones of rotary kilns, operating at 1450°C. In new dry-process production lines, they offer a service life of one to two years, reducing replacement frequency. Different grades of high-alumina bricks are also used in high-temperature areas, such as cement kiln preheaters and decomposition furnaces.
High-alumina bricks are equally important in the ceramic and glass industries.
In the 1300-1400°C firing zone of ceramic kilns, they ensure kiln sealing and thermal stability. They also protect the regenerator lattice of glass melting furnaces from high-temperature flue gas erosion, extending service life. Furthermore, non-ferrous metal smelting and chemical roasting furnaces rely on their refractory properties for refractory performance.
As the “refractory backbone”, high-alumina bricks not only support the stable operation of basic industries, but also play an important role in the green transformation of industry.