What is high alumina brick? What is the grade standard of high alumina bricks?

High-alumina brick is a kind of shaped refractory material in refractory brick products. It is made of refractory clay or other refractory raw materials. It belongs to silicon-alumina series products. Clay bricks, magnesia bricks, corundum bricks, mullite bricks, silicon carbide bricks and other materials, high-alumina bricks are widely used in refractory bricks. Etc.: Class I—Al2O3 content>75%; Class II—Al2O3 content of 60-75%; Class III—Al2O3 content of 48-60%.

High alumina brick is a kind of refractory material, the main component of this kind of refractory brick is AL2O3. The refractoriness of high alumina bricks is higher than that of clay bricks and semi-silica bricks. Belongs to refractory material. There are more Al2O3 in high alumina bricks, which are close to neutral refractory materials, and can resist the erosion of acidic slag and alkaline slag.

According to the content of AL2O3, it is divided into several grades such as 55, 65, 75, and 80.

High alumina bricks are divided into the following types from the content of aluminum oxide (Al2O3):

Corundum brick: aluminum content is not less than 90%;

Super high alumina brick: aluminum content is not less than 85%;

Grade I high alumina brick: the aluminum content is not less than 75%;

Grade II high alumina brick: the aluminum content is not less than 65%;

Grade III high alumina brick: the aluminum content is not less than 55%.

High alumina brick: Aluminosilicate refractory product with aluminum oxide (Al2O3) content higher than 48%.

If the content of Al2O3 is higher than 90%, it is called corundum brick. Due to different resources, national standards are not completely consistent.

For example, European countries stipulate that the lower limit of Al2O3 content for high alumina refractories is 42%.

In China, according to the content of Al2O3 in high alumina bricks, it is usually divided into three grades: Grade I - Al2O3 content > 75%; Grade II - Al2O3 content of 60 to 75%; Grade III - Al2O3 content of 48 to 60%.

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