Sodium Metabisulfite (Cyanide Detoxification Agent)
CAS Number: 7681-57-4
Sodium Metabisulfite (SMBS) is the primary reagent used in the SO2/air cyanide detoxification process (INCO process) for treatment of gold mine tailings and process effluents containing free and weak-acid-dissociable cyanide. In the presence of copper catalyst and air, SMBS oxidizes cyanide to cyanate and thiocyanate, reducing cyanide concentrations to meet regulatory discharge standards. It is also used as a reducing agent in flotation circuits for cyanide destruction prior to tailings disposal.
Technical Specifications
| appearance | White crystalline powder |
| moisture (%) | ≤0.5 |
| SO2 content (%) | ≥64 |
| Na2S2O5 content (%) | ≥96.5 |
Applications
- Cyanide detoxification of gold mine tailings (INCO SO2/air process)
- Process water cyanide treatment prior to reuse or discharge
- WAD cyanide reduction in CIP/CIL tailings streams
- Cyanide removal from flotation tailings before disposal
- Emergency cyanide neutralization in spill response
Key Features
- Primary reagent for INCO SO2/air cyanide detoxification process
- High active SO2 content maximizes cyanide destruction efficiency
- High purity grade ensures reliable performance in compliance-critical treatment
- Available in bulk packaging suitable for large-scale mine water treatment
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CAS Number
7681-57-4
Category
Mining / Flotation ChemicalsAvailability
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