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Sodium Sulphide

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Sodium Sulphide (Na₂S) is a yellow to red-yellow crystalline solid or powder with a characteristic odor of hydrogen sulfide. It is highly soluble in water, forming strongly alkaline solutions. This 25kg packaged product is widely used in the chemical, leather, pulp and paper, and textile industries as a reducing agent, sulfur donor, and in flotation processes. Due to its strong reducing properties and reactivity, it must be handled with care under proper safety measures.

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Category: Leaching Agents Tags: Inorganic Sulfide Salt, Na₂, Sodium Sulphide, Strong Odor, Water treatment, Yellow to Red Crystalline Powder

Description

Table of Contents

Sodium Sulphide

Primary Uses

Leather Industry

Dehairing Agent: Used in the liming and dehairing steps of leather processing to remove hair and other unwanted components.
Tanning Agent: Facilitates sulfide tanning processes.

Pulp & Paper Industry

Kraft Pulping: Acts as a reducing agent and chemical in the kraft process to break down lignin and facilitate pulp production.
Deinking Process: Used to remove inks and other contaminants from recycled paper.

Chemical Industry

Sulfur Source: Provides sulfide ions for the synthesis of various sulfur-containing chemicals.
Flotation Agent: Used in mineral processing to separate ores via flotation techniques.
Redox Reactions: Employed as a reducing agent in organic and inorganic chemical syntheses.

Textile Industry

Bleaching and Dyeing: Used in vat dyeing and as a bleaching agent to remove excess dye.
Reducing Agent: Maintains reducing environments during dyeing processes.

Water Treatment

Oxygen Scavenger: Removes dissolved oxygen from boiler water to prevent corrosion.

Environmental Applications

Wastewater Treatment: Used to precipitate heavy metals and neutralize acidic wastes.

Secondary Uses

Pharmaceutical Industry

Intermediate: Used in small quantities for synthesis of some pharmaceutical compounds.

Mining Industry

Ore Processing: Employed in the flotation and extraction of sulfide ores.

Laboratory & Research

Reagent: Utilized as a reducing agent in various analytical and synthetic procedures.

KEY PRODUCT FEATURES

1. Basic Identification Attributes

Chemical Name (IUPAC): Sodium sulfide
Common/Trade Name: Sodium sulphide, Sodium sulfide nonahydrate (if hydrated)
CAS Number: 1313-82-2
HS Code: 2830.20.00
Synonyms: Sodium sulfide, Disodium sulfide, Sodium sulfide hydrate (depending on form)

2. Physical & Chemical Properties

Physical State: Yellow to red-yellow crystalline solid or powder
Color & Odor: Yellow; strong odor of H₂S (hydrogen sulfide)
Solubility: Highly soluble in water, releasing alkaline and sulfide ions
Density: 1.856 g/cm³ (anhydrous)
Melting Point: 1180 °C (decomposes)
pH (aqueous solution): Strongly alkaline (pH ~11-14)
Appearance: Crystalline or granular solid, hygroscopic

3. Safety & Hazard Attributes

GHS Classification:
- Acute Toxicity (Oral) Category 4
- Skin Corrosion/Irritation Category 1B
- Serious Eye Damage/Eye Irritation Category 1
- Acute Toxicity (Inhalation) Category 3
- Hazardous to the Aquatic Environment (Chronic) Category 2
Toxicity: LD₅₀ (oral, rat) ~ 207 mg/kg
Exposure Limits: OSHA PEL: 5 mg/m³ (as sulfide dust/mist)
Corrosivity: Strongly corrosive to skin and eyes
Odor Warning: Emits toxic and flammable hydrogen sulfide gas when exposed to moisture or acids

4. Storage & Handling Attributes

Storage Conditions: Store in a cool, dry, well-ventilated area away from moisture, acids, and oxidizers
Container Type: 25kg HDPE drums or lined bags, tightly sealed
Shelf Life: 12 months under proper storage
Handling Precautions: Use personal protective equipment; avoid contact with skin, eyes, and inhalation; store separately from acids and moisture sources

5. Regulatory & Compliance Attributes

REACH Registered
Complies with OSHA Hazard Communication Standard
UN Number: UN 1829 (Sodium Sulfide, solid, toxic)
Transport Classification: Class 6.1 Toxic substances

6. Environmental & Health Impact

Biodegradability: Not biodegradable
Ecotoxicity: Toxic to aquatic life; LC₅₀ (fish) approx. 10 mg/L
Bioaccumulation: Not expected
Aquatic Impact: Harmful if released into water bodies

SAFETY HANDLING PRECAUTIONS

Safety Handling Precautions

PPE Required: Chemical-resistant gloves, goggles, face shield, respiratory protection in dusty or fume conditions
Handling Guidelines: Use in well-ventilated areas; avoid moisture contact; use spill containment measures
Storage Measures: Keep containers tightly closed; isolate from incompatible substances

First Aid Measures

Inhalation: Move to fresh air immediately; seek urgent medical attention for breathing difficulties
Skin Contact: Rinse immediately with plenty of water for at least 15 minutes; remove contaminated clothing; seek medical help
Eye Contact: Rinse thoroughly with water for at least 15 minutes; get immediate medical attention
Ingestion: Do not induce vomiting; rinse mouth and seek immediate medical attention

Firefighting Measures

Fire Hazards: May release toxic hydrogen sulfide gas when exposed to acids or moisture
Extinguishing Media: Use water spray, dry chemical, or foam; avoid dry powders that react violently
Hazardous Combustion Products: Hydrogen sulfide (H₂S), sulfur oxides (SOx)