Industrial Grade Sodium Sulfide Na₂S with 60% Purity in Yellow Flakes for Highly Soluble Applications

Sodium Sulfide

Sodium Sulfide is a significant inorganic compound and a powerful reducing agent, recognized for its strong reducibility, alkalinity, and ability to form polysulfides. It serves crucial roles in traditional industrial processes and emerging technological fields. Its production primarily involves the carbothermic reduction of sodium sulfate with coal or other carbon sources.

❋ Aliases: Sodium Sulfuret
❋ English Name: Sodium Sulfide
❋ Chemical Formula: Na₂S (often encountered as hydrates, especially Na₂S·9H₂O)
❋ Molecular Weight: 78.04 (anhydrous), 240.18 (nonahydrate)
❋ CAS Number: 1313-82-2 (anhydrous), 1313-84-4 (nonahydrate)

Key Properties: Strong reducing agent, alkaline, forms polysulfides, deliquescent, reacts with acids to release toxic H₂S gas.

Advanced Application Scenarios

1. "Dehairing and Reducing Agent" in Leather Tanning and Textile Industry

• Leather Processing: Used as a depilatory agent for hides and skins, effectively removing hair. Also helps in swelling the hide.

• Textile Dyeing: Serves as a reducing agent in the application of sulfur dyes, converting the insoluble dye into a soluble leuco form for fabric absorption.

2. "Precipitant and Resource Recovery Agent" in Metallurgy and Waste Treatment

• Ore Flotation: Acts as a flotation agent for certain ores.

• Heavy Metal Precipitation: Effectively precipitates heavy metal ions (e.g., Cu²⁺, Pb²⁺) from industrial wastewater as insoluble sulfides, facilitating their removal and potential recovery.

• Spent Catalyst Processing: Used in the hydrometallurgical recovery of valuable metals (e.g., molybdenum, vanadium) from spent catalysts.

3. "Sulfur Source and Intermediate" in Chemical Synthesis

• Fine Chemicals: Employed as a sulfurating agent or reducing agent in the synthesis of various organic chemicals, dyes, and intermediates.

• Sodium Thiosulfate Production: A key raw material in the manufacturing of sodium thiosulfate ("hypo").

4. "Pulp Digestion Aid" in Papermaking

• Kraft Process: A key component of the white liquor used in the Kraft pulping process, where it contributes to breaking down lignin and facilitating its separation from cellulose fibers.

Technological Breakthroughs and Sustainable Development

Production Process Improvement

• Development of more energy-efficient reduction processes and improved reactor designs to optimize yield and reduce energy consumption.

• Implementation of measures to capture and utilize off-gases, reducing environmental impact.

Safety and Handling Enhancements

• Promotion of safer forms, such as fused solid flakes or granules, which are less dusty and easier to handle compared to low-grade solid forms.

• Development and strict adherence to safe handling protocols, including proper ventilation and personal protective equipment (PPE), due to the risks associated with H₂S generation and corrosivity.

Environmental Compliance and Waste Minimization

• Implementation of closed-loop systems in certain applications (e.g., pulp mills) to recover and regenerate chemicals.

• Treatment of effluent streams to remove residual sulfide and other contaminants before discharge, complying with stringent environmental regulations.

Quality Control and Standardization

• Implementation of advanced analytical techniques for precise quality control, ensuring consistent composition and meeting specifications for different industrial grades.

Technical Advantages

Quality Specifications (Varies by Grade)

• Na₂S Content: Typically 60-62% for common flake form (contains water of crystallization).

• Iron (Fe): ≤ 30 ppm (for high-purity grades).

• Water-Insoluble Matter: Low levels specified for pure grades.

Physical Characteristics

• Appearance: Yellow or red-brown flakes, granules, or solid lumps (due to presence of polysulfides). Pure anhydrous Na₂S is white but readily oxidizes.

• Solubility: Highly soluble in water. The solution is strongly alkaline.

• Hygroscopicity: Deliquescent.

Application Support

• Provides technical data sheets (TDS) and Material Safety Data Sheets (MSDS) detailing handling, storage, and safety information.

• Offers guidance on proper dissolution methods and safe handling practices for specific applications.