Sodium Sulfide – Industrial Grade Na2S, Uses and Specifications

Sodium Sulfide (Na2S) is an industrial chemical that supports leather processing, paper manufacturing, mineral recovery, textile dyeing, and wastewater treatment. Manufacturers use its alkaline and reducing properties to remove hair from hides, process wood fibers, modify mineral surfaces, and precipitate heavy metals. Commercial buyers often prefer 60% flakes because they offer concentrated active content and practical transportation options. Choosing the right grade requires careful evaluation of purity, iron content, packaging, and technical specifications.

What Is Sodium Sulfide?

This inorganic compound contains sodium and sulfide ions. When it dissolves in water, it creates a strongly alkaline solution that supports several industrial chemical reactions.

The industry also uses names such as Sodium Sulphide, Disodium Sulfide, and Sodium Monosulfide. These terms generally refer to the same chemical family, although commercial products may contain different amounts of water and impurities.

Pure anhydrous Na2S appears colorless or white. However, industrial flakes often show yellow, orange, or reddish colors because manufacturing conditions and impurities influence their appearance.

Most commercial grades contain approximately 60–62% active Na2S by mass. The remaining material mainly consists of hydration water and smaller quantities of other substances.

Chemical Properties and Identification

Manufacturers may offer different impurity limits and physical characteristics. Therefore, buyers should always compare the technical data sheet and certificate of analysis before confirming an order.

Industrial Grade 60% Flakes and Their Benefits

The 60% grade remains a common choice for companies that need concentrated sulfide material for regular production.

Manufacturers supply this product in solid flake form, allowing industrial users to prepare solutions according to their operational requirements.

Why Do Manufacturers Choose Flakes?

Industrial buyers value this form for several reasons:

• High active concentration: Each kilogram provides a substantial amount of useful chemical content.

• Flexible processing: Operators can prepare different solution strengths under controlled conditions.

• Efficient transportation: Solid material reduces the additional water weight associated with dilute solutions.

• Multiple applications: The same compound supports different manufacturing sectors.

• Bulk availability: Standard industrial packaging supports regular purchasing and inventory planning.

However, active concentration alone does not determine quality. Iron content, insoluble matter, and chemical stability also influence performance.

For this reason, professional buyers evaluate the complete product specification instead of comparing only the percentage printed on the packaging.

Major Industrial Applications

This chemical plays an important role in several manufacturing processes. Its reducing behavior and sulfide chemistry allow industries to achieve different technical objectives.

1. Leather Tanning and Hide Processing

Tanneries use sulfide compounds during the beamhouse stage to remove hair from animal hides.

The active chemical breaks disulfide bonds in keratin, weakening the hair structure and supporting effective removal.

Manufacturers commonly combine it with lime to create suitable processing conditions.

This treatment offers several advantages, including:

• Efficient hair removal

• Consistent hide preparation

• Improved processing control

• Compatibility with established tannery operations

However, excessive chemical exposure can damage the hide structure and affect the quality of finished leather.

Therefore, experienced operators monitor treatment conditions, processing time, and chemical consumption.

2. Pulp and Paper Manufacturing

The kraft pulping process uses alkaline chemicals to separate lignin from cellulose fibers.

During this operation, Na2S works alongside sodium hydroxide to create an effective cooking liquor.

Hydrosulfide ions contribute to lignin breakdown and help manufacturers process wood into usable pulp.

Paper producers use this chemistry to manufacture packaging paper, paperboard, and other cellulose-based products.

The process requires careful control of chemical composition, temperature, and treatment conditions.

For related alkaline materials, industrial buyers can explore Caustic Soda Flakes, which also support paper manufacturing and other chemical operations.

3. Heavy Metal Removal in Wastewater Treatment

Industrial wastewater may contain dissolved metals such as copper, zinc, lead, nickel, and cadmium.

Treatment facilities can use sulfide chemistry to convert certain dissolved metal ions into poorly soluble metal sulfides.

After the reaction, suitable separation equipment removes the resulting solids from the treated water.

This approach can support operations in:

• Metal finishing facilities

• Mining operations

• Chemical manufacturing plants

• Selected industrial wastewater systems

However, treatment efficiency depends on the target metals, pH, chemical dosage, and separation process.

Operators must also prevent dangerous hydrogen sulfide generation, particularly when acidic conditions develop.

Professional treatment systems require suitable monitoring, ventilation, and emergency controls.

4. Mining and Mineral Flotation

Mining companies use sulfide reagents in selected mineral-processing operations.

Depending on the ore composition, the chemical can modify mineral surfaces and support sulfidization.

For example, some flotation systems use controlled surface treatment to improve the recovery of certain oxidized minerals.

However, the reagent does not provide the same benefits for every ore.

Engineers must evaluate mineral composition, water chemistry, flotation conditions, and reagent compatibility before introducing it into a production circuit.

Laboratory trials help determine whether the treatment improves recovery and selectivity.

5. Textile Dyeing and Color Processing

Textile manufacturers use reducing agents during selected sulfur dyeing processes.

Certain sulfur dyes require chemical reduction before they can enter textile fibers effectively.

Under alkaline conditions, the reagent helps convert these dyes into a more soluble form.

After application, controlled oxidation restores the dye to a less-soluble state inside the fabric.

This method supports the production of dark-colored textiles, including selected black and navy fabrics.

Manufacturers must control chemical concentration and oxidation conditions to achieve consistent color quality.

6. Chemical Manufacturing and Industrial Intermediates

Chemical producers use Na2S as a raw material in selected sulfur-containing reactions.

Its reactivity supports the manufacture of certain dyes, organic sulfur compounds, and industrial intermediates.

The required grade depends on the production process and final product specifications.

Some applications require tighter impurity limits, while general industrial operations may accept broader specifications.

Manufacturers working with alkaline chemical systems can also explore Sodium Silicate for related industrial applications.

Technical Data Sheet (TDS)

The following table provides illustrative specifications for commercial 60% flakes. Actual product values depend on the manufacturer and production batch.

Note: These values represent an illustrative industrial-grade specification rather than verified batch results. Buyers should request the manufacturer’s current TDS and Certificate of Analysis before purchasing.

Yellow Flakes vs Red Flakes

Commercial flakes commonly appear yellow, orange, or reddish.

Differences in iron concentration, polysulfide content, and manufacturing conditions can influence the final color.

However, appearance alone cannot establish product quality.

A yellow product does not automatically perform better than a red product.

Instead, buyers should review laboratory results, impurity limits, and application requirements.

For processes that require consistent color or low contamination, iron concentration may matter more than visual appearance.

How to Choose the Right Industrial Grade

Selecting the correct material requires more than checking the active percentage.

Different industries place different demands on chemical purity and physical characteristics.

For Leather Manufacturing

Tanneries should prioritize consistent active content, suitable dissolution behavior, and compatibility with their processing conditions.

Reliable chemical composition helps operators maintain predictable dehairing performance.

For Textile Production

Textile manufacturers should pay particular attention to iron concentration and other impurities.

These substances may influence dye quality, fabric appearance, and production consistency.

For Water Treatment

Treatment facilities should evaluate chemical activity, target metal concentrations, dosing systems, and wastewater characteristics.

They must also maintain appropriate controls for residual sulfide and hydrogen sulfide hazards.

For Mineral Processing

Mining engineers should evaluate reagent performance through laboratory tests and controlled plant trials.

The most suitable grade depends on mineral composition, flotation chemistry, and recovery objectives.

Why Impurity Levels Matter

Two commercial products may contain the same percentage of active material but produce different operating results.

For example, excessive insoluble matter may increase residue formation, while unwanted metallic impurities may affect sensitive production processes.

Therefore, buyers should compare the complete technical specification and consider the total operating cost.

Sodium Sulfide Price and Bulk Purchasing

Industrial chemical prices depend on several commercial and technical factors.

Buyers should evaluate product quality, order quantity, packaging, transportation, and delivery conditions before comparing quotations.

Main Factors Affecting Market Prices

• Active Na2S concentration

• Iron content and impurity limits

• Product grade and appearance

• Manufacturing costs

• Bulk order quantity

• Packaging type

• Country of origin

• Freight and logistics expenses

• Destination port and delivery terms

Large-volume buyers may negotiate different commercial conditions depending on the required quantity and shipment schedule.

However, the lowest quoted price does not always provide the best purchasing value.

Compare the Cost of Active Material

A useful purchasing method involves calculating the cost per metric ton of active Na2S.

Consider the following hypothetical offers:

These figures serve only as examples and do not represent current market prices.

Although Grade B contains more active material, Grade A provides a lower cost per metric ton of active content in this example.

Nevertheless, buyers must also consider chemical performance, impurity levels, freight, and waste generation.

A slightly more expensive grade may provide better overall value when it improves processing consistency or reduces operational problems.

Packaging and International Shipping

Manufacturers commonly supply industrial flakes in 25 kg moisture-resistant bags.

Packaging options may vary according to the supplier, product characteristics, and export requirements.

For bulk orders, buyers should confirm package compatibility, labeling, palletization, and transportation conditions.

Important Packaging Considerations

Suitable packaging should protect the material against moisture and contamination during storage and transportation.

Buyers should also consider:

• Package integrity

• Suitable chemical-resistant materials

• Clear product identification

• Batch traceability

• Dangerous-goods labeling

• Export documentation

• Storage and handling instructions

International shipments must follow applicable dangerous-goods transport regulations.

Importers should confirm the correct classification, packaging requirements, and documentation with the supplier and freight provider.

Storage and Safety Guidelines

This chemical requires strict safety controls because it can cause severe skin burns and eye damage.

Contact with acids can also release hydrogen sulfide, a highly toxic and flammable gas.

Industrial facilities should follow the product-specific Safety Data Sheet and establish appropriate handling procedures.

Recommended Safety Practices

• Keep containers tightly closed and protect them from moisture.

• Store the material away from acids and incompatible oxidizing agents.

• Maintain suitable ventilation.

• Use appropriate chemical-resistant protective equipment.

• Prevent uncontrolled contact with wastewater and drainage systems.

• Train employees in chemical handling and emergency procedures.

• Follow local environmental and occupational safety regulations.

Operators should never rely on odor to detect dangerous hydrogen sulfide concentrations.

Appropriate monitoring equipment and emergency planning play essential roles in safe industrial operations.

Sodium Sulfide vs Sodium Hydroxide

Both compounds produce alkaline solutions, but they have different chemical functions.

Na2S supplies reactive sulfide species and supports processes such as dehairing, sulfur dyeing, and metal precipitation.

Sodium hydroxide primarily supplies strong alkalinity and supports chemical processing, cleaning, and pH adjustment.

Manufacturers can explore Caustic Soda Liquid for related industrial applications.

For additional information about alkaline compounds, read Sodium Hydroxide vs Sodium Carbonate.

Bulk Supply for International Industrial Buyers

Basekim supplies industrial chemicals for manufacturers, distributors, and bulk purchasers seeking suitable grades and export solutions. Buyers interested in 60% flakes should confirm product availability, technical specifications, packaging, quality documentation, and shipment terms before placing an order.

Request a Commercial Quotation

A complete purchasing inquiry should include the following information:

• Required chemical grade

• Minimum active content

• Maximum acceptable iron concentration

• Order quantity

• Preferred packaging

• Destination port

• Required delivery terms

• Technical documentation requirements

Providing these details helps the sales team identify suitable product options and prepare a relevant commercial quotation.

Buyers should also request a current Technical Data Sheet, Safety Data Sheet, and batch-specific Certificate of Analysis before confirming large-volume purchases.

Frequently Asked Questions

What are the main industrial uses of Sodium Sulfide?

Manufacturers use this compound in leather dehairing, pulp and paper production, mineral processing, textile dyeing, chemical synthesis, and heavy metal removal. Its alkaline and reducing properties support several industrial reactions.

What does the 60% grade mean?

The percentage indicates the approximate mass fraction of active Na2S in the commercial product. The remaining material mainly consists of hydration water and smaller amounts of impurities. Buyers should confirm the exact composition through technical documentation.

Are Sodium Sulfide and Sodium Sulphide the same chemical?

Yes. Both names describe the same chemical compound. American English commonly uses “sulfide,” while British English often uses “sulphide.” The chemical formula remains Na2S.

What is the difference between yellow and red flakes?

Color differences can reflect variations in iron compounds, polysulfides, and manufacturing conditions. However, appearance alone cannot determine purity or performance. Buyers should compare active content, impurity limits, and laboratory results.

Is this chemical dangerous?

Yes. The material can cause severe chemical burns and eye damage. Contact with acids may release highly toxic hydrogen sulfide gas. Industrial users must follow the Safety Data Sheet and maintain suitable safety controls.

How can industrial buyers place a bulk order?

Buyers should specify their required grade, active concentration, impurity limits, quantity, packaging, and destination. They should then request a commercial quotation and review the technical documents before confirming the purchase.