[Main Uses] In the fertilizer industry, it is mainly used to manufacture phosphoric acid, superphosphate and ammonium sulfate; in the petroleum industry, it is mainly used for the refining of gasoline, lubricating oil and other products; in the chemical fiber industry, it is mainly used to manufacture viscose silk; in the plastic industry, it is mainly used to manufacture epoxy resin, polytetrafluoroethylene, organosilicon rubber, silicone oil, styrene-butadiene rubber and nitrile rubber, etc.; in addition, it also plays an important role in the steel industry, non-ferrous metal industry, atomic energy industry and rocket technology.