Refractory clay is one of the most basic and versatile materials in the refractory industry. The special refractory materials are mainly zirconia, titanium oxide, cerium oxide, cerium oxide, cerium oxide, cerium oxide and so on. These raw materials have different degrees of resistance to various slags, but because of the lack of raw materials, they cannot be used in a large number in the refractory industry. Rotary kiln can only use under special circumstances, so it is called a special refractory raw material. The raw materials of alkaline refractories are mainly magnesite, dolomite, lime, olivine, serpentine and high alumina oxygen raw materials. These raw materials have strong resistance to alkaline slag and are mostly used for masonry alkaline.