Sodium hydrosulfide (NaHS) is an inorganic compound composed of sodium ions and hydride ions. It is a white or yellow solid with strong reducing properties, able to react quickly with water to form a sodium hydrogen sulfide solution, and release hydrogen sulfide gas. Sodium hydrosulfide absorbs moisture and decomposes easily in the air, so it usually needs to be stored in a dry environment.

Uses of Sodium Hydrosulfide are shown as below:

1. Mining and metallurgical industry: Sodium hydrosulfide is used in the mining and metallurgical industry to extract and refine metals such as copper, lead, zinc, nickel, and gold and silver. It aids in the enrichment and recovery of metals by forming a precipitate of metal sulfides.

2. Organic chemical synthesis: As a reducing agent, sodium hydrosulfide is used in organic chemical synthesis for desulfurization, denitrification, dehalogenation and other reactions, as well as as a catalyst or reaction intermediate in the synthesis of drugs and agricultural chemicals.

3. Textile processing: Sodium hydrosulfide has been used in the bleaching and decolorization processes of textiles, especially in the production and dyeing of sulfide dyes. However, these uses have been reduced due to environmental and health concerns.

4. Water treatment: Sodium hydrosulfide is used as a precipitant in water treatment to remove heavy metal ions in water and clarify water quality.

5. Paper industry: Sodium hydrosulfide was used in the bleaching process of the paper industry to improve the brightness and whiteness of the paper.

6. Pharmaceutical: In the production process of some drugs, sodium hydrosulfide is used as a catalyst or reaction intermediate.

7. Pesticides and fertilizers: Sodium hydrosulfide is used as a raw material or additive in the manufacture of pesticides and fertilizers.