The alumina hollow ball brick is made of alumina hollow ball as the main material, corundum superfine powder as the additive, and organic matter as the binder. After being formed and dried, the alumina hollow ball brick is fired in a high temperature kiln at 1750 ℃. It belongs to the category of light corundum thermal insulation brick. This material has both the low thermal conductivity of thermal insulation brick and the high compressive strength. It is a light thermal insulation brick that can be used normally at 1700 ℃. Alumina hollow ball bricks have excellent high temperature resistance and thermal insulation performance. They can be directly used as the working lining of high-temperature kilns. They will achieve significant results in reducing the furnace body weight, reforming the structure, saving materials, and saving energy.
1. High operating temperature:
It can reach above 1750 ℃, and the load softening temperature is high. The linear change rate of reheating is small, and the use is longer.
2. Optimize the structure and reduce the furnace weight:
At present, the high-temperature resistant materials used in the kiln lining are all heavy bricks, with the bulk density of 2.3-3.0g/cm, while the alumina hollow ball bricks are only 1.3-1.5g/cm, with the same cubic meter volume. The weight of alumina hollow ball bricks can be reduced by 1.1-1.9t.
3. Material saving:
To reach the same service temperature, if heavy corundum bricks are used, the price is equivalent to that of alumina hollow ball bricks, and considerable insulating refractory materials are required. If alumina hollow ball bricks are used, 1.1-1.9 tons of heavy corundum bricks can be saved per cubic meter, and 80% of refractory and thermal insulation materials can be saved.
4. Energy saving:
Aluminum oxide hollow ball has obvious thermal insulation characteristics and low thermal conductivity, which can achieve good thermal insulation effect, reduce heat emission, improve thermal efficiency, and thus save energy. The energy saving effect can reach more than 30%.
