Dicalcium fused magnesia is a natural magnesite with a calcium silicon ratio greater than 2, which is melted at high temperature in an electric arc furnace. It has the characteristics of complete structure, good chemical stability, and special high-temperature performance. It is one of the most important raw materials for refractory materials, used for manufacturing various magnesium bricks, magnesium aluminum bricks, ramming materials, furnace repair materials, etc. Containing a large amount of impurities, used for laying the bottom of steelmaking furnaces, etc.