Overview
Sodium sulfide flakes (Na2S) are an inorganic compound primarily produced for industrial use. As a strong reducing agent, it plays a critical role in sulfur-based chemical processes. The flake form offers convenient handling and controlled dissolution compared to powdered variants. Industrial-grade sodium sulfide typically contains 60-70% Na2S, with the remainder being water of crystallization and minor impurities. Its distinctive yellow or reddish color comes from polysulfide impurities formed during production. The compound has been commercially significant since the early 20th century, particularly in leather and textile industries.
Physical and Chemical Properties
Sodium sulfide flakes exhibit hygroscopicity, readily absorbing moisture from air to form hydrates. The compound undergoes exothermic dissolution in water, creating a strongly alkaline solution (pH ~12-13) that can corrode metals and organic materials. Key chemical behaviors include its reducing capacity (standard redox potential -0.66V) and reaction with acids to produce toxic hydrogen sulfide gas. The material decomposes at high temperatures, releasing sulfur oxides. Technical grades often contain antioxidants to minimize oxidation during storage.
Main Applications
In textile manufacturing, sodium sulfide serves as a reducing agent in sulfur dye processes and assists in desulfurizing synthetic fibers. The leather industry utilizes it for hair removal and deliming hides during tanning. Water treatment plants employ Na2S for heavy metal precipitation, particularly in neutralizing chromium, zinc, and copper effluents. Mining operations use it as a flotation agent for copper and lead ores. Emerging applications include use in battery technologies and as a sulfur source in specialty chemical synthesis.
Safety and Storage
Proper storage requires sealed containers with desiccants in cool, ventilated areas separate from acids and oxidizers. Moisture exposure can cause caking and hazardous H2S release. Facilities should have H2S detectors and alkaline neutralization supplies. Personnel must wear chemical goggles, PVC gloves, and acid-resistant aprons when handling. In case of skin contact, flush immediately with water for 15 minutes. Spills should be contained with inert absorbents and disposed as hazardous waste according to local regulations.
B2B Procurement Guide
Industrial buyers should specify required purity (standard 60% or high-purity 70% grades), packaging type (multi-layer kraft bags with PE lining preferred), and batch testing certificates. Container loading typically allows 20-24 MT per 20'FCL. Quality indicators include low insoluble matter (<0.5%) and consistent flake thickness (2-5mm). Verify supplier compliance with ISO 9001 and Responsible Care standards. Regional price variations occur due to energy costs in production (primarily via coal reduction process). Consider bulk purchases with staggered delivery to ensure freshness.
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