Inorganic chemical industry is the abbreviation of inorganic chemical industry. It uses natural resources and industrial by-products as raw materials to produce inorganic acids such as sulfuric acid, nitric acid, hydrochloric acid, and phosphoric acid, soda ash, caustic soda, synthetic ammonia, chemical fertilizers, and inorganic salt. The main raw materials of inorganic chemical products are sulfur, sodium, phosphorus, potassium, calcium and other chemical minerals and coal, oil, natural gas, air, water and so on. In addition, by-products and wastes in many industrial sectors are also raw materials for inorganic chemicals, such as: coke oven gas in the coking production process in the iron and steel industry. The ammonia contained in it can be recovered by sulfuric acid to make ammonium sulfate.