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Sodium Thiosulfate Anhydrous Na₂S₂O₃ 99% Purity Water Dechlorinator and Non-Cyanide Gold Leaching Agent
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Sodium Thiosulfate Anhydrous Na₂S₂O₃ 99% Purity Water Dechlorinator and Non-Cyanide Gold Leaching Agent
| MOQ: | 10Tons |
| Price: | Please contact customer service |
| Standard Packaging: | Bagged |
| Delivery Period: | About six weeks |
| Payment Method: | T/T |
| Supply Capacity: | 100,000 tons per year |
Detail Information
Place of Origin
China
Brand Name
SiChun HongJian
Model Number
Sodium thiosulfate
Document
Chemical Formula:
Na2S2O3
Appearance:
Colorless Or White Crystalline Powder (anhydrous); Colorless Monoclinic Crystal (pentahydrate)
Purpose:
Medical Treatment, Wastewater Treatment, Analytical Chemistry, Metal And Mineral Treatment, Etc
Melting Point:
48 ℃
Boiling Point:
100 ℃
Highlight:
99% Purity Sodium Thiosulfate Anhydrous
,Water Dechlorinator Na₂S₂O₃
,Non-Cyanide Gold Leaching Agent
Product Description
Sodium Thiosulfate Anhydrous | Gold Leaching Agent & Water Dechlorinator
Sodium thiosulfate pentahydrate (Na₂S₂O₃*5H₂O), traditionally known in many industries as "Da sūdǎ" or "hypo," is a versatile inorganic compound with critical roles in both technical and medical fields. Our premium-grade product, certified at 99% purity, is specifically refined to serve as an essential Photographic Fixer in traditional and specialized imaging processes and as a reliable Cyanide Antidote in emergency medical and industrial safety applications.
Product Specifications
| Alias | Haibo, Sodium Thiosulfate, Sodium Hyposulfite |
|---|---|
| English Name | Sodium Thiosulfate |
| Chemical Formula | Na₂S₂O₃ |
| Molecular Weight | 158.108 |
| CAS Number | 7772-98-7 |
Product Overview
Sodium Thiosulfate Anhydrous (Na₂S₂O₃) represents the concentrated, water-free form of this versatile reducing agent and complexing compound. Devoid of crystalline water, it offers higher active content per unit mass and enhanced stability under dry conditions, making it ideal for moisture-sensitive industrial processes. Our technical-grade product is engineered for two major applications: as an innovative, environmentally preferable Gold Leaching Agent in mining and precious metal recovery, and as an efficient Water Dechlorinator in municipal water treatment, aquaculture, and industrial discharge systems.
This white, crystalline powder exhibits strong reducing power and the ability to form stable complexes with various metal ions—properties that are harnessed in metallurgy, photography, chemical manufacturing, and environmental remediation. Produced through controlled crystallization and dehydration processes, our anhydrous sodium thiosulfate maintains consistent purity, rapid solubility, and low impurity profiles suitable for demanding technical applications.
Gold Leaching Agent Applications
In the mining and precious metals sector, Sodium Thiosulfate Anhydrous has gained prominence as a viable Gold Leaching Agent, offering a non-cyanide alternative for extracting gold from ores, concentrates, and recycled materials. The thiosulfate leaching process is particularly advantageous for ores containing copper, carbonaceous matter, or other constituents that interfere with conventional cyanidation.
The mechanism involves the formation of a stable gold-thiosulfate complex [Au(S₂O₃)₂]³⁻ in alkaline, oxidizing conditions, typically with copper(II) as a catalyst and ammonia as a pH regulator. Compared to cyanide, thiosulfate presents lower toxicity, faster kinetics for certain ore types, and reduced environmental permitting challenges.
Key Advantages for Mining Operations
- Higher sodium thiosulfate content (>98%) reduces transportation and storage costs
- Minimizes unintended hydration during storage in humid climates
- Optimized for consistent solubility and reactivity in heap leach or tank leach circuits
- Controlled particle size ensures uniform distribution in leaching solutions
- Used in gold stripping from loaded carbon or resins
- Effective for recovering silver from photographic and electronic waste
Water Dechlorination Applications
For water treatment applications, Sodium Thiosulfate Anhydrous serves as a highly effective Water Dechlorinator, neutralizing chlorine (Cl₂), hypochlorite (OCl⁻), and chloramines (NH₂Cl, NHCl₂) to harmless chloride ions. This reaction is crucial in scenarios where residual disinfectants must be removed to protect aquatic ecosystems, sensitive industrial processes, or biological treatment systems.
Primary Water Treatment Uses
- Municipal and industrial wastewater treatment plants prior to discharge
- Drinking water distribution networks for microbiological testing
- Aquaculture and aquarium systems for safe water conditions
- Emergency spill response to neutralize chlorine leaks
- Textile and paper bleaching to quench residual oxidants
The dechlorination reaction is rapid and stoichiometric: Na₂S₂O₃ + 4Cl₂ + 5H₂O → 2NaHSO₄ + 8HCl. The anhydrous form offers advantages in handling and dosing accuracy due to its consistent composition and lack of water-of-hydration variability.
Additional Industrial Applications
Beyond gold leaching and dechlorination, sodium thiosulfate anhydrous is utilized in chemical synthesis as a reducing agent and sulfur source, in petroleum refining to scavenge hydrogen sulfide, in leather processing as an antichlor, and in analytical chemistry as a standardizing reagent.
Product Specifications & Packaging
- Assay: ≥98.0%
- Moisture: ≤0.5%
- Water-insoluble matter: ≤0.1%
- Sulfate/sulfide limits within industry norms
- Packaging: Moisture-resistant 25 kg bags or bulk containers
- Storage: Cool, dry conditions to prevent caking or oxidation
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