Essential Features and Industrial Advantages:
Some of the key features and benefits of sodium sulfide include the following:
- High reactivity.
- Powerful reducing agent.
- Highest soluble (in both flake and solution form).
- Provides sulphur ions for precipitation and chemical reactions.
- Raw material for many different business sectors and applications at a low cost.
These properties make it suitable for use in processes that need either metal removal, odor control, or the synthesis of chemicals.
Technical composition and properties
Industrial sodium sulfide typically has the following characteristics:
- Effective Na2S (sodium sulfide) content: 60%–70% (60% flakes or solutions).
- Moisture/water of hydration: Technical grades have higher levels of moisture.
- Polysulfides: Technical-grade sodium sulfide has a yellowish-red color due to the presence of polysulfides.
Physical and chemical properties are as follows:
- Density: About 1.8 to 1.9 grams/cm³( solid);
- Hygroscopic: Absorbs moisture and releases hydrogen sulfide (H2S) vapor in the atmosphere;
- pH: Highly alkaline when dissolved in water;
- Reactivity: Sodium sulfide is very reactive with acids and hence releases.
If sodium sulfide is handled improperly, it can be quite dangerous due to its strong alkaline character and the possibility of releasing hydrogen sulfide.
Industrial Applications by Sector
1. Leather Industry
- The unhairing process is used to break down keratin and remove hair from animal hides.
- This process results in producing higher-quality leather for the footwear, apparel, and accessory industries.
2. Paper and Pulp
- Necessary ingredients for breaking down lignin in wood when using the Kraft process.
- Separates cellulose fibers for the production of high-quality pulp.
3. Textile Industry
- Used in sulfur-dye coloring of cotton fabrics and other fabrics.
- Acts as a reducing agent that converts dyes into soluble leuco-dyes.
4. Mining and Ore Processing
- Used in the flotation process to separate copper, lead, and zinc ores.
- Changes the surface properties of minerals, making them easier to float.
5. Water Treatment
- Used to remove heavy metals like mercury, cadmium, and lead from wastewater.
- Enables industries to comply with increasingly stringent environmental discharge regulations.
How to Check the Quality of Sodium Sulfide
Before buying in bulk, make sure to consider these essential points:
- Amount of Effective Na2S content (determined by titration or lab analysis).
- Appearance and colour (i.e., should be consistently yellow-red in appearance and not have any large black specks).
- Moisture/Loss on drying should equal the grade specifications.
- The odor of H2S and handling safety (a strong smell indicates active sulfide).
- Insoluble residue (low in high-quality material).
Always ask for a Certificate of Analysis (COA) and MSDS or Safety Data Sheet (SDS) before making any purchase.
Major Global and Chinese Suppliers
The top producers and exporters of Sodium Sulfides are large chemical companies in the USA, China, Europe, and the Middle East.
Global producers
- Solvay (Belgium)
- Tessenderlo Group (Brussels)
- Tokyo Chemical Industry(Japan)
China Manufacturers
- Nafina Chemical Industry
- Inner Mongolia Lichuan Chemical
- Shezhou Jiaxin Chemical
- Xintai Wanhe Chemical
With the exception of China and the USA, both countries provide a very large supply of sodium sulfide for sale to the industrial sector around the world.
Where to buy Sodium Sulfide in Pakistan?
Sodium sulfide (Na2S) can be obtained in Pakistan from the following suppliers:
- Karachi – Industrial chemical dealers at Jodiya Bazaar
- Lahore – Shah Alam Market and other construction and chemical suppliers
- Faisalabad & Gujrat – Chemical dealers that focus on textiles and tanneries.
Usually, sodium sulfide is supplied in 25 kg or 50 kg high-density polyethylene (HDPE) bags (flakes), or as a solution in tanks for use in various industries such as pulp, mining, and tanning.
Typical Price Range (2026, Industrial Grade)
Price will depend on the grade of sodium sulfide (industrial vs food grade), form (flakes vs solution), and whether it was imported.
- Global bulk range (FOB): USD 444 per metric ton for sodium sulfide.
- Pakistan Local Market: Approximately Rs. 120-200 per kg depending on grade, quantity, and supplier.
Always compare COA, purity, packaging, and material safety data sheets (MSDS) between suppliers.
Tianjin Unilion will assist you with finding high-quality sodium sulfide products (Na₂S) from reliable international sources, including quality checking. We arrange for shipment and customs clearance so that you receive the material with the least risk.
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