According to the content of aluminum oxide (Al2O3) in high-alumina bricks, it is often used in 48%, 55%, 60%, 65%, 73%, 75% content. Of course, there is a higher content above the corundum transfer.
According to the content of 55 or less, it is called a clay brick, which is a neutral refractory material and is made by bakelite or other materials with high alumina content. With high thermal stability, fire-resistant temperature around 1700 °C, used for glass furnace, cement rotary kiln, steel-making furnace lining. Of course, there are some high-alumina clay bricks and high-alumina brick products with high softness, low creep, and low porosity, which are important for the ratio of raw materials in production depending on the needs of different applications.
The high-alumina bricks and clay bricks are not only different in alumina content, but their production processes are similar, but the incorporation of clinker in the ingredients is high, which can reach 90-95%, and the firing temperature is also higher than the clay bricks. Many, in the actual test, one or two high-alumina bricks are mostly used in tunnel kilns with temperatures of 1500-1600°C, and many furnaces such as blast furnaces, furnace tops, reverberatory furnaces, and rotary kiln liners.
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