Dye production, bleaching agent for silk and linen, metal heat treatment agent, steel corrosion inhibitor, pharmaceutical intermediate, glass product production, emulsion explosive production in civil explosive industry, antidote for cyanide poisoning, laboratory analysis reagent, in meat products Used as a coloring agent, anti-microbial agent and preservative in processing, it is called industrial salt.

The enamel industry is used as a fluxing agent, an oxidizing agent, and a raw material for formulating tantalum powder. The glass industry is used as a decolorizing agent, defoaming agent, clarifying agent and oxidizing flux for various glass and products. The inorganic industry is used as a decolorizing agent for molten caustic soda and for the manufacture of other nitrates. The food industry is used as a coloring agent for meat processing to prevent meat from deteriorating and to impart a flavoring effect. The fertilizer industry is used as a quick-acting fertilizer for acidic soils, especially for fern root crops such as sugar beets and radishes. The dye industry is used as a raw material for the production of picric acid and dyes. The metallurgical industry is used as a heat treatment agent for steel making and aluminum alloys. The machinery industry is used as a metal cleaning agent and as a ferrous black bluing agent. The pharmaceutical industry is used as a medium for penicillin. The cigarette industry is used as a combustion improver for tobacco. Used as a chemical reagent in analytical chemistry. In addition, it is also used to produce explosives.