Use: Silicon steel magnesia not only possesses the physical and chemical properties of active magnesium oxide, but also can react with acidic oxides such as silica (SiO2), at high-temperature, to form MgSiO3 or react further to generate MgSiO4 which is the key ingredient of insulation coating for silicon-steel sheet. Therefore, it is mainly used as the separant in the high-temperature annealing of silicon steel in the manufacturing process, and the agent for formation of coating insulation, in order to improve the insulation performance of the silicon steel sheet, and reduce the degree of wear of the silicon steel sheet; meanwhile, it is also the best chemical raw material for production of the oriented silicon steel sheet.