Overview
Sodium sulfide nonahydrate is a hydrated salt form of sodium sulfide, primarily used in industrial processes requiring controlled sulfur reduction. As a commodity chemical, it plays critical roles in leather tanning (hair removal), textile manufacturing (sulfur dyeing), and mining (metal ore separation). The compound's nine water molecules make it more stable for handling than anhydrous forms, though it remains moisture-sensitive. Industrial grades typically contain 60-62% Na₂S, with impurities like sodium carbonate and thiosulfate.
Physical and Chemical Properties
This crystalline solid exhibits deliquescence, gradually absorbing atmospheric moisture to form solutions. When dissolved, it yields strongly alkaline solutions (pH ~12-13) due to hydrolysis. The material decomposes upon heating, losing water molecules above 50°C and forming anhydrous Na₂S at 120°C. Chemically, it serves as a potent nucleophile and reducing agent. Its solutions react exothermically with acids to produce toxic hydrogen sulfide gas—a key safety consideration. The compound also participates in redox reactions with many metal ions, forming insoluble metal sulfides.
Main Applications
In leather production, sodium sulfide nonahydrate breaks down keratin proteins to facilitate hair removal from hides. The textile industry employs it as a reducing agent for sulfur dyes and to strip color in denim processing. Mining operations use it to separate metal ores via flotation, where it modifies mineral surface properties. Additional applications include wastewater treatment (heavy metal precipitation), pulp/paper manufacturing, and as a precursor for other sulfur compounds like sodium hydrosulfide.
Safety and Storage
Requires corrosion-resistant packaging (polyethylene-lined drums) to prevent moisture ingress and container degradation. Storage areas must be well-ventilated, dry, and segregated from acids or oxidizing agents due to H₂S gas risk. Personnel handling this chemical need alkali-resistant gloves, face shields, and respirators where dust or solution mists may form. Spills should be contained with inert absorbents (vermiculite) and neutralized with dilute acid in controlled conditions. Always consult local regulations for disposal requirements.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO-certified production facilities and batch analysis certificates. Key specifications include Na₂S content (≥60%), insoluble matter (<0.5%), and iron content (<30 ppm) for dyeing applications. Transportation typically requires UN1849 hazard labeling. For large-volume purchases (20+ tons), negotiate FOB contracts with moisture-proof packaging guarantees. Consider regional suppliers to minimize storage duration and degradation risks during transit.
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