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Electrofused brown corundum is obtained through further processing of ordinary brown corundum, thereby improving its performance in various aspects. Electrofused brown corundum is used primarily in refractory materials due to its superior high-temperature resistance compared to ordinary brown corundum. However, the use of electrically fused brown corundum in refractory materials often leads to problems such as pulverization and cracking, which causes great dissatisfaction among customers. So what is the moral reason behind such problems occurring with electrically fused brown corundum? The reason is simple: the quality does not meet the standards. To be precise, the magnetic substances in electrofused brown corundum have not been removed. The magnetic substances in electrofused brown corundum are mainly iron oxides, which are removed during production through methods such as magnet separation. However, if the production technology is not mature, magnetic substances may remain, and the amount of these residues has a significant impact on the quality of electrofused brown corundum. When there is an excessive amount of magnetic material, the expansion coefficient of refractory materials made using electrofused brown corundum as an aggregate becomes very high; as a result, they are prone to expansion and deformation during heating, which can lead to cracking. This is the main reason for their fragmentation and explosion. Where does iron come from? There are mainly two sources of iron: one is contained within bauxite itself, and the other is rust that forms as a result of long-term use of the equipment, which accidentally gets mixed in during the production process. And neither of these two approaches can be easily avoided, which is why the magnetic separation process becomes particularly important.