Uses: Strong water absorption, can be used as dehydrating agent, carbonized wood, paper, cotton and linen fabrics and biological skin and meat and other carbohydrate-containing substances. It is an important industrial raw material, which can be used in the manufacture of fertilizers, drugs, explosives, pigments, detergents, batteries, etc., and is also widely used in purifying petroleum, metal smelting and dyes and other industries. It is often used as a chemical reagent and can be used as a dehydrating agent and sulfonating agent in organic synthesis. Inorganic chemical industry is widely used, such as fertilizer plants used to produce phosphate fertilizer, ammonium sulfate; Daily chemical plants also need to use sulfuric acid in the production of detergents; It is also used in petrochemical and chemical fiber production. It can be used in metallurgy to leach oxidation minerals, and the acid used for blue (blackening) treatment of machinery factory parts. Sewage plants are used to neutralize alkaline wastewater, etc.