Enamel industry is used as flux, oxidizer and raw material for preparing enamel powder. Glass industry is used as decolorizer, defoamer, clarifier and oxidation flux for all kinds of glass and products. Non hunger industry is used as decolorizer of molten caustic soda and other nitrates. The food industry is used as a coloring agent for meat processing, which can prevent meat from deteriorating and play a seasoning role. Fertilizer industry is used as quick acting fertilizer for acid soil, especially for root crops, such as beet, radish, etc. The dye industry is used as a raw material for the production of picric acid and dyes. Metallurgical industry is used as heat treatment agent for steel-making and aluminum alloy. Machine city industry is used as metal cleaner and black metal bluing agent. The pharmaceutical industry is used as a medium for penicillin. The cigarette industry is used as a combustion supporting agent for tobacco. Used as a chemical reagent in analytical chemistry. In addition, it is also used in the production of explosives.