Classification of corundum

Source: | Author:ChangXing Refractory | Published time: 1556 days ago | 1113 Views | Share:

There are many types of corundum-based refractory materials. The traditional corundum-based refractory materials include white corundum, tabular corundum, sub-white corundum, dense corundum, brown corundum and chrome corundum.

Among them, white corundum is a product obtained by melting and cooling industrial alumina or calcined alumina as raw materials. Due to the characteristics of the raw material itself, white corundum has a higher porosity and contains more closed pores; dense corundum is industrial alumina As a raw material, it is smelted in an electric arc furnace by adding some additives, which is characterized by high density; brown corundum is smelted in an electric arc furnace by adding a small amount of carbon and iron scraps as raw material by lightly burning high bauxite;

Subwhite corundum is generally called alumina-based fused corundum. It is made from first-grade or super-grade bauxite, added with a reducing agent and smelted at high temperature. The above four types of corundum are all prepared by fused method. In addition, there is also a sintering method to obtain corundum raw materials, such as plate-shaped corundum. Sintered corundum uses industrial alumina as a raw material and is calcined to produce low-porosity alumina.

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