Burnt magnesium brick refers to an alkaline refractory product that is fired from periclase as the main raw material. Fired magnesia bricks have a high load softening temperature and strong resistance to alkaline slag erosion, but poor seismic resistance and weak resistance to acid slag erosion. Burned magnesia bricks are mainly used for the walls and bottoms of basic open hearth and electric furnaces for steelmaking, as well as for the permanent lining of oxygen converters, iron mixers, nonferrous smelting furnaces, and high-temperature tunnel kilns; The lining of rotary kilns for calcining magnesia and cement, the upper lattice bricks of glass furnaces, and the bottom and end of soaking pits and heating furnaces for rolling steel.