Product Category: Mining Chemicals / Water Treatment Chemicals / Reducing Agents
Chemical Name: Sodium Metabisulphite
Alternative Names: SMBS / Sodium Metabisulfite / Sodium Pyrosulphite
CAS Number: 7681-57-4
Chemical Formula: Na₂S₂O₅
Molecular Weight: 190.11 g/mol
Appearance: White crystalline powder
Product Overview
Sodium Metabisulphite is a strong reducing agent used extensively across mining, water treatment, chemical processing, food preservation and industrial applications.
For Mining Chemicals SA, one of its most important uses is in mining process chemistry and cyanide destruction.
Typical Technical Specification
| Property | Typical Reference |
| SKU | MCS-S12 |
| Sodium Metabisulphite | Approx. ≥98.7% high-quality grade |
| SO₂ Assay | Approx. ≥66.5% |
| Appearance | White crystalline powder |
| Insolubles | Typical ≤0.005% |
| Chloride | Typical ≤0.05% |
| Formula | Na₂S₂O₅ |
| CAS Number | 7681-57-4 |
| pH – 10% Solution | Approx. 4.0–4.6 |
INEOS specifies a high-quality commercial SMBS grade at ≥98.7%, with ≥66.5% SO₂ assay.
Mining Applications
- Cyanide destruction
- Gold-mining processes
- Cobalt processing
- Nickel processing
- Silver-processing applications
- Dechlorination
- Oxygen scavenging
INEOS specifically identifies SMBS for cyanide destruction and leaching applications in mining, including gold, cobalt, nickel and silver operations.
Additional Applications
- Municipal wastewater dechlorination
- Pulp and paper
- Textile treatment
- Food preservation where appropriate certified grade is supplied
- Detergents and cleaning products
- Antioxidant applications
Key Benefits
- Strong reducing agent
- Effective dechlorination chemical
- Established mining reagent
- Water soluble
- Versatile oxygen scavenger
Storage & Safety
Store dry and well ventilated.
Contact with acids can release sulphur dioxide gas.
Protect from moisture and incompatible oxidising chemicals.
