High-class alumina brick is a kind of refractory material, the main component of this kind of refractory brick is AL2O3.

If the Al2O3 content 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, the content of Al2O3 in high alumina bricks, it is usually divided into three grades: Grade I——Al2O3 content>75%; Grade II——Al2O3 content is 60~75%; Grade III——Al2O3 content is 48~60%.

Aluminum silicate refractory products with aluminum oxide (Al2O3) content higher than 48%.
A neutral refractory with an alumina content of more than 48%. It is formed and calcined from bauxite or other raw materials with high alumina content. High thermal stability, refractoriness above 1770℃. It has good slag resistance and is used for the lining of steelmaking electric furnaces, glass melting furnaces, cement rotary furnaces, etc.

High-load soft, low-creep high-class alumina brick are high-grade refractory materials made of super-grade bauxite, fused corundum, and fused mullite as the main raw materials. This product has the advantages of small high-temperature creep, strong corrosion-resistance, good thermal shock stability, etc. It is suitable for large and medium-sized hot blast stoves. It opens up the next article for the localization of high-quality and high-grade imported refractory materials for new hot blast stoves in my country. The road to success has been included in the national "Spark Plan" project.

Characteristic of high-class alumina brick
a. Refractoriness
The refractoriness of high-alumina bricks is higher than that of clay bricks and semi-silica bricks, reaching 1750~1790℃, which belongs to advanced refractory materials.

b, load softening temperature
Because of the high Al2O3 in high alumina products, fewer impurities, and less fusible glass body, the softening temperature under load is higher than that of clay bricks.
High alumina brick
High alumina brick
, but because the mullite crystal does not form a network structure, the softening temperature under load is still not as high as that of silica brick.

c. Slag resistance
There is more Al2O3 in high alumina bricks, which are close to neutral refractory materials, and can resist the erosion of acid slag and alkaline slag. Because it contains SiO2, the ability to resist alkaline slag is weaker than that of acid slag.