Sodium Sulfide

Sodium Sulfide, also written as sodium sulphide or sodium monosulfide (Na₂S), is an inorganic sulfur salt supplied as yellow, pink or brick-red crystalline flakes or lumps. CAS number 1313-82-2. In commerce it is usually handled as the hydrated form (Na₂S·xH₂O), which dissolves readily in water to give a strongly alkaline, reducing solution with a characteristic sulfidic odour.

The material is highly soluble, deliquescent and a powerful source of sulfide ions, making it valuable wherever reduction, precipitation or sulfidisation is required. It should be stored in cool, dry, well-ventilated conditions away from acids and oxidisers, since contact with acids liberates hazardous hydrogen sulfide. Typical commercial grades are rated by Na₂S assay, commonly in the 30-60% range, with iron and water-insoluble content among the key quality indicators, though exact strength should be confirmed against the supplied certificate of analysis rather than assumed.

Applications

• Flotation reagent and sulfidising agent in the mining and recovery of copper, lead and zinc ores
• Depressant and pH modifier in mineral processing circuits
• Dehairing and unhairing of hides in leather tanning
• Reduction of dyes and manufacture of sulfur dyes in textiles
• Heavy-metal precipitation in effluent and wastewater treatment
• Pulp processing in the kraft paper industry

Euro Chemical Supplies offers sodium sulfide flakes factory-direct from ISO-certified manufacturers, each lot independently tested to specification before dispatch. Packaging options include sample quantities, moisture-barrier bags, sealed drums and palletised units suited to export, with safety data sheets and documentation prepared for international shipment.

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