1. The dye industry is used to produce sulfide dye, which is the raw material of sulfide blue and sulfide blue. The printing and dyeing industry is used as the aid to dissolve sulphur dyes. It is used in the leather industry to hydrolyze the raw skin and to make the dry skin water to be softened by the preparation of sodium polysulfide. The paper industry is used as a cooking agent for paper. The textile industry is used for the reduction of denitrification and nitrification of artificial fibers, as well as the dyeing agent of cotton fabrics. The pharmaceutical industry is used to produce antipyretic drugs such as phenyxidine. In addition, it is used to make sodium sulphate, sodium thiohydride and sodium polysulfide.
2. The addition of proper amount of sodium sulphide in aluminum and alkaline etching solution can significantly improve the quality of etching surface and can be used for removal of alkali soluble heavy metal impurities in alkaline etching solution.
3. Sodium sulphide can also be used for the treatment of conductive layer in direct plating, and the purpose of forming a good conductive layer on non-metallic surface is achieved through the reaction of sodium sulfide and palladium.
4. Used as a corrosion inhibitor. It is also the raw material of sodium thiosulfate, sodium polysulfide and sulphur dye.
5. Used to make sulphur dyes, leather depilation agents, metal smelting, photography, rayon denitration and so on.