Secondary high alumina brick is a refractory material, the main component of this 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 set the lower limit of Al2O3 content of high-alumina refractories at 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 is 60～75%; Grade III──Al2O3 content is 48～ 60%.
feature
1. Refractoriness
The fire resistance of high alumina bricks is higher than that of clay bricks and semi-silica bricks, reaching 1750~1790℃. It is a high-quality refractory material.
2. Load softening temperature
Because high-alumina products have high Al2O3, less impurities, less fusible glass, and higher load softening temperature than clay bricks. However, since mullite crystals do not form a network structure, the softening temperature under load is still not as high as that of silica bricks.
3. Slag resistance
High alumina brick contains more Al2O3, which is close to neutral refractory material, and can resist the erosion of acid slag and alkaline slag. Due to the inclusion of SiO2, the ability to resist alkaline slag is weaker than that of acidic slag.
Mainly used for lining of blast furnaces, hot blast stoves, electric furnace tops, blast furnaces, reverberatory furnaces, and rotary kilns. In addition, high-alumina bricks are also widely used as open-hearth heat storage checker bricks, plugs for pouring systems, nozzle bricks, etc., but the price of high-alumina bricks is higher than that of clay bricks, so there is no need to use clay bricks that can meet the requirements.
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