Introduction

Sodium Sulfide is an inorganic compound widely used in various industrial sectors due to its powerful reducing and desulfurizing properties. It typically appears as a yellow, solid flake or crystalline material with a strong odor of hydrogen sulfide. As a versatile chemical, Sodium Sulfide plays a crucial role in leather tanning, water treatment, and the mining industry. Its efficiency and cost-effectiveness make it a high-demand chemical in global markets.

What is Sodium Sulfide?

Sodium Sulfide (chemical formula: Na₂S) is a yellow-to-red crystalline solid that dissolves readily in water, forming a highly alkaline solution. It releases hydrogen sulfide gas (H₂S) upon exposure to moisture, giving it a distinctive pungent odor. Available in anhydrous and hydrated forms, sodium sulfide is prized for its reactivity as a reducing agent and its role in industrial purification processes.

Chemical and Physical Properties of Sodium Sulfide

Sodium Sulfide (Na₂S) has a molar mass of 78.04 g/mol. In its pure form, it is colorless, but industrial grades often appear yellow due to polysulfide impurities. It is highly soluble in water and forms a strongly alkaline solution. When exposed to air, it can oxidize and release toxic hydrogen sulfide gas, requiring careful handling. Its melting point is around 1,176°C, and it reacts readily with acids and oxidizing agents.

Applications and Uses of Sodium Sulfide

Sodium sulfide’s unique properties make it indispensable in a variety of industries. Below are its major applications:

1. Pulp and Paper Industry

• The Kraft process employs Na₂S to dissolve the natural binder in wood, lignin, which separates the cellulose fibers. It provides a product that is very suitable for high-quality paper products, ranging from packaging materials to printing papers for commercial use.

2. Water Treatment

• It effectively precipitates heavy metals as insoluble sulfides in wastewater treatment and is thus used for the removal of heavy metals. It acts as an oxygen scavenger, thus preventing corrosion in water systems. For this reason, it has become indispensable at municipal and industrial water treatment centers.

3. Textile Industry

• It serves in textiles as a degumming and desulfurizing agent. It removes sulfur impurities and neutralizes chlorine-based bleaching agents to ensure superior fabric quality with minimum environmental impact. This contributes to more sustainable and efficient textile production processes.

4. Leather Industry

• The tanning process of leather production uses Na₂S, which acts in the depolymerization of proteins, thus removing hair from animal hides to produce soft and high-quality leather for clothing, furniture, and accessories.

5. Chemical Manufacturing

• Na₂S is essential in producing sulfur dyes and rubber chemicals. It enhances rubber elasticity and provides durable, colorfast dyes for textiles and industrial products, ensuring longevity and performance.

Grades and Forms of Sodium Sulfide

Commercial Sodium Sulfide is available in various grades and concentrations, depending on the intended application:

• Sodium Sulfide 60% (flake form) – commonly used in leather processing and mining.
• Sodium Sulfide 70% – higher purity, often used in more critical industrial processes.
• Liquid Sodium Sulfide – used in closed systems for easier dosing and handling.

Each grade offers different levels of reactivity and purity, making it essential to choose the correct type for specific applications.

Production Process

Sodium Sulphide is typically produced by reacting sodium carbonate (soda ash) with sulfur or hydrogen sulfide under controlled conditions. Another method involves the direct reduction of sodium sulfate using carbon at high temperatures. The final product is purified, cooled, and flaked or dissolved based on its end use.

Packaging and Storage

• Sodium Sulfide is commonly packed in:
  • 25 kg and 50 kg plastic-lined woven bags
  • 1000 kg jumbo bags
  • For liquid form: IBC tanks or drums

  It must be stored in a dry, well-ventilated area, away from moisture and acids. Containers should be sealed tightly to prevent degradation and gas emission.

Safety Considerations

• PPE: Wear chemical-resistant gloves, goggles, and respiratory protection.
• Ventilation: Ensure workspace airflow to prevent H₂S gas accumulation.
• Spill Response: Use absorbents (e.g., sand) and dispose of waste per EPA guidelines.
• First Aid: Flush skin/eyes with water for 15 minutes; seek medical help if exposed

Why Choose Sodium Sulfide?

Sodium sulfide’s unique combination of reducing power, cost efficiency, and versatility makes it indispensable across industries. From purifying wastewater to manufacturing durable textiles, Na₂S delivers consistent performance when handled responsibly.

Partner with trusted suppliers like ZÜMRÜT International Kimya Co. for high-purity sodium sulphide tailored to your industrial needs.

TECHNICAL DATASHEET

SPECIFICATIONS	RESULTS
Appearance	Yellow Flakes
Na2S, %	60 ± 2
Na2SO3, %	< 2
Na2CO3, %	< 0.5
Fe, ppm	< 10
Insoluble Content, %	< 12
Density, g/ cmᵌ	1600
Melting Point, ℃	92

 

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