[China Aluminum Network] High-alumina bricks are mainly used for masonry blast furnaces, hot blast stoves, electric furnace tops, blast furnaces, reverberatory furnaces, and rotary kiln linings. In addition, high-alumina bricks are widely used as refrigerated checkered bricks for open hearth furnaces, plug heads for gating systems, and nozzle bricks. 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.
The refractoriness of high-alumina bricks is higher than that of clay bricks and semi-silica bricks, which is as high as 1750~1790°C. It is an advanced refractory material. Because of the high Al2O3 content in high-alumina products and the low amount of impurities, the formation of friable glass bodies is less, so the load softening temperature is higher than that of clay bricks, but since the mullite crystals do not form a network structure, the load-reinforced softening temperature is still not high for the silicon bricks. Therefore, the ability to resist alkaline slag is weaker than that of acid-resistant slag.
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