Characteristics of high alumina bricks

Refractoriness

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

Load softening temperature

Because of the high Al2O3 in high alumina products, less impurities and less fusible glass body, the softening temperature under load is higher than that of clay bricks, but because mullite crystals do not form a network structure, the softening temperature under load is still lower than that of silica bricks.

Slag resistance

There are 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.

The use of high alumina bricks

Mainly used for masonry blast furnace, hot blast stove, electric furnace roof, blast furnace, reverberatory furnace, rotary kiln lining. In addition, high alumina bricks are also widely used as open hearth regenerative checker bricks, plugs for pouring systems, nozzle bricks, etc. However, the price of high-alumina bricks is higher than that of clay bricks, so it is not necessary to use high-alumina bricks where clay bricks can meet the requirements.