Sodium Hydrosulfide (NaHS)

What Is Sodium Hydrosulfide?

Sodium hydrosulfide, also called sodium hydrogen sulfide or sodium bisulfide, is an inorganic sulfur compound with the formula NaHS. It is used as a sulfiding, reducing and process reagent in mining, leather, pulp and paper, chemical manufacturing and selected wastewater-treatment applications.

Commercial NaHS is commonly supplied as hydrated flakes or an aqueous solution. The required form, concentration and impurity limits should be confirmed before ordering.

AOZUN supports sodium hydrosulfide sourcing for qualified industrial applications. Grade, specification, packaging and transport requirements are confirmed at the quotation stage.

Which Sodium Hydrosulfide Form Do You Need?

A “70% NaHS” product normally refers to hydrated flakes, not a conventional 70% aqueous solution. Buyers should confirm whether the quoted percentage is an active-content specification or a solution concentration.

Sodium Hydrosulfide Identification and Properties

Color can vary with concentration, iron, polysulfides, oxidation and storage conditions. The agreed specification and batch COA should govern acceptance.

What Is Sodium Hydrosulfide Used For?

Mineral Processing and Flotation

NaHS is used as a sulfidizing and flotation reagent in selected copper, molybdenum and other mineral-processing circuits. Dosage should be established through ore-specific flotation testing.

Leather Processing

Sodium hydrosulfide may be used as a process aid in dehairing and related tannery operations. Closed dosing and hydrogen-sulfide controls are essential.

Pulp and Paper

NaHS is used as a sulfur-containing process chemical in selected pulp and cellulose operations.

Dyes and Textile Processing

It can be used in the manufacture or application of sulfur dyes and in other controlled reducing processes.

Wastewater and Metal Precipitation

NaHS may be used to precipitate selected dissolved metals as metal sulfides. Treatment must be designed to prevent excess sulfide and hydrogen-sulfide release.

Chemical Manufacturing

It can serve as a sulfur source, reducing reagent or intermediate in the production of sulfur-containing chemicals.

Which Sodium Hydrosulfide Specifications Matter Most?

The correct NaHS grade depends on active content, process sensitivity, dosing equipment and acceptable impurity levels.

Specifications must state whether results are reported on an as-received, dry or active basis. Typical values are not substitutes for guaranteed limits.

How Is NaHS Different from Similar Sodium Chemicals?

“Sodium hydrosulfide” and “sodium hydrosulfite” are not interchangeable. Every inquiry should include the formula NaHS and the appropriate CAS number.

Packaging, Storage and Safe Handling

NaHS flakes are hygroscopic and can oxidize when exposed to air. Store them in tightly sealed, moisture-resistant packaging in a cool, dry and well-ventilated area.

NaHS solutions require compatible, corrosion-resistant tanks, piping, valves and pumps. Closed transfer and controlled ventilation are strongly recommended.

Never mix sodium hydrosulfide with acids. Acid contact or a significant reduction in pH can release highly toxic hydrogen sulfide gas.

Hydrogen sulfide may accumulate in tanks, process enclosures and low areas. Its odor must not be used as a safety warning because the sense of smell can rapidly become unreliable. Suitable fixed or portable gas monitoring, ventilation and emergency procedures are required.

Always follow the current SDS, site risk assessment and applicable transport and workplace regulations.

Which Packaging Should Buyers Select?

Packaging depends on physical form, quantity, transport route and local regulations.

Possible commercial formats include:

• Moisture-resistant bags for flakes

• Approved drums for solid product

• Compatible drums or IBCs for qualifying solutions

• Tank trucks, tank containers or other bulk systems for solution grades

Final packaging availability must be confirmed with the quotation. Transport classification can differ by concentration, hydration and product form.

Which Documents Should a NaHS Supplier Provide?

Depending on the destination and application, buyers may request:

• Batch-specific Certificate of Analysis

• Safety Data Sheet

• Technical Data Sheet

• Active NaHS and impurity test methods

• Country-of-origin information

• Manufacturing or retest date

• Packaging specification

• Dangerous-goods declaration

• Transport classification and shipping documents

• Application-specific iron or heavy-metal data

Why Source Sodium Hydrosulfide from AOZUN?

AOZUN helps buyers define the required NaHS form, active content, sodium-sulfide limit, carbonate limit, iron requirement, packaging and destination before quotation.

Availability and specifications are confirmed according to the application and current supply conditions. COA, SDS and available shipping documents can be requested for technical review.

Frequently Asked Questions About Sodium Hydrosulfide

Is sodium hydrosulfide organic or inorganic?

It is an inorganic sulfide salt composed of sodium and hydrosulfide ions.

Is NaHS a fine chemical or an intermediate?

NaHS is primarily a bulk inorganic industrial chemical and process reagent. It can also be classified as a chemical intermediate, but it is not normally considered a fine chemical.

Are sodium hydrosulfide and sodium hydrogen sulfide the same?

Yes. Both names generally refer to NaHS.

Is sodium hydrosulfide the same as sodium sulfide?

No. Sodium hydrosulfide is NaHS, while sodium sulfide is Na₂S. Their active content, alkalinity and application behavior differ.

Why are commercial NaHS flakes approximately 70%?

Commercial flakes are commonly supplied as a hydrated material containing crystal water. The NaHS assay is therefore lower than that of theoretical anhydrous NaHS.

Can NaHS release hydrogen sulfide?

Yes. Contact with acids or a decrease in pH can release toxic H₂S gas. Closed handling, gas monitoring and suitable ventilation are essential.

What information should be included in an NaHS inquiry?

Specify flakes or solution, required assay, Na₂S limit, Na₂CO₃ limit, iron limit, quantity, packaging, application and destination.

Request a Quote for Sodium Hydrosulfide

Please provide:

• Required form: flakes or solution

• Required NaHS concentration

• Na₂S, Na₂CO₃ and iron limits

• Intended application

• Required quantity and packaging

• Destination country and port

• Required technical and transport documents

Contact AOZUN to discuss sodium hydrosulfide specifications, packaging, documentation and current availability.