Molten alumina fused white corundum

The commonly referred to "fused alumina" generally refers to "fused white corundum". It is made from calcined alumina or industrial alumina as raw materials, melted at high temperature in an electric arc furnace, with AI2O3 ≥ 99%, white, block material, apparent porosity of 6%~10%, main crystal phase of α - Al2O3, crystals in the form of long strips and diamonds, and often in the form of skeletal crystals.
Due to the purity of the raw materials, no chemical reactions occur during electric furnace operation, but the temperature and cooling rate of the molten liquid have a significant impact on the structure of the block material. In terms of homogenization, it is important to obtain blocks that are as dense as possible. When Na2O in the raw material solidifies, it forms β - AI2O3, which is easily concentrated in the central part of the block and can have adverse effects on refractory and grinding materials. Therefore, it is necessary to pay attention to the content of Na2O in the raw material. In addition, there is a small amount of garnet glass equivalent in the block material.