Sodium Thiosulfate Crystals, Gold Leaching for Mining & Plating.

Product Overview

Our Sodium Thiosulfate (Na₂S₂O₃), commonly known as "Hypo" or photographic fixer, is a high-purity crystalline compound widely used in photographic processing, water treatment, and chemical industries. With excellent reducing properties and solubility, it serves as a versatile chemical across multiple applications.

Technical Specifications

✅ Chemical Formula: Na₂S₂O₃
✅ Purity: ≥99% (Anhydrous)
✅ Appearance: White crystalline powder
✅ Solubility: Highly water soluble
✅ pH Value: 6.5-8.0 (5% solution)
✅ Packaging: 25kg/bag or customized options

Sodium Thiosulfate crystals are gaining increasing attention and application in the field of gold extraction as an environmentally friendly leaching agent, particularly suitable for mining sites where traditional cyanidation is not feasible (e.g., near residential areas or in highly sensitive environments). Its gold leaching mechanism involves, with the synergistic catalysis of ammonia and copper ions, forming stable complexes with gold [Au(S₂O₃)₂]³⁻, effectively dissolving fine-grained gold from the ore. Compared to highly toxic cyanide, Sodium Thiosulfate offers significant advantages: low toxicity, rapid degradation, environmental friendliness, and relatively safe handling. The leaching process typically occurs under alkaline conditions, which helps reduce equipment corrosion and offers better tolerance towards certain impurities in the ore (like copper and antimony). Beyond mining applications, high-purity Sodium Thiosulfate is also crucial in the electroplating industry, specifically in cyanide-free silver plating for electronic components. Acting as the primary complexing agent, it forms stable complex salts with silver ions, ensuring plating bath stability and yielding deposits with fine, uniform grain structure and excellent conductivity. It is widely used for surface finishing precision components like semiconductor lead frames and electrical contacts. This product offers high-purity crystals with excellent solubility and high reactivity, making it an ideal choice for the green mining and advanced electroplating industries.

Safety & Handling

⚠ Storage: Keep in dry, cool, and well-ventilated area
⚠ Handling: Wear appropriate PPE (gloves, goggles)
⚠ Incompatibilities: Strong oxidizers, acids

Why Choose Us?

✅ High-purity products, in compliance with international standards
✅ 30+ Years Chemical Manufacturing Experience
✅ Strict QC with Batch Traceability
✅ Global logistics, supporting sea and air transportation
✅ Technical support, providing customized solutions
✅ Factory direct supply, with strong price competitiveness