Its products can be divided into two categories: Metallurgical magnesia and magnesia products. Dashiqiao refractories can be divided into metallurgical magnesia, magnesia brick, magnesia-silica brick, magnesia-alumina brick, magnesia-calcium brick, magnesia-carbon brick and other varieties according to their chemical composition and use. Its performance is greatly influenced by CaO/SiO2 ratio and impurities. The load softening point and thermal shock resistance of high purity magnesia bricks are much better than those of ordinary magnesia bricks. High refractoriness and good resistance to alkaline slag and iron slag are important advanced refractories. Magnesium products are usually produced by sintering method. The sintering temperature is generally between 1500 ~1800 ~C. In addition, chemical binders can be added to make unburned bricks and amorphous refractories. It is mainly used in open hearth furnace, electric furnace, oxidation converter, non-ferrous metal smelting furnace, cement kiln and calcining kiln of alkaline refractory.