Magnesium calcium brick series magnesia dolomite sand or dolomite sand, high purity and dense magnesia as raw material, according to the different use of the environment design CaO/MgO, using anhydrous binder, forming at the appropriate temperature, high temperature firing. The product has strong resistance to erosion of external refining slag, good high temperature resistance, and has the functions of desulfurization, removal of non-metallic inclusion and other clean molten steel. Products are widely used in stainless steel smelting AOD, VOD, CLU and other smelting equipment.