Using high-quality magnesia as raw material, it is sintered at high temperature after pulverization, batching, mixing, and molding. The higher the sintering temperature, the higher the degree of direct bonding between periclase crystals in the product, and its corrosion resistance and high temperature resistance The better the performance. With high refractoriness, good alkali slag resistance and high load softening starting temperature, magnesia bricks are mainly used in permanent linings for steelmaking: iron mixers, magnesium alloy furnaces, and non-ferrous metallurgy working linings: lime Pre-heating zone, cooling zone and regenerator of glass cellar.