Sodium Metabisulfite

Na₂S₂O₅ · CAS 7681-57-4

Mining ReagentHS 2832.2000Industrial Grade

Sodium Metabisulfite (SMBS) is a white crystalline powder widely used as a depressant and deoxidizer in mineral flotation and gold leaching processes. It effectively suppresses pyrite and other sulfide minerals while protecting cyanide from decomposition.

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Technical Specifications

Parameter	Specification
Sodium Metabisulfite (Na₂S₂O₅)	96.5% min
Sulfur Dioxide (SO₂) Content	65.0% min
Iron (Fe) Content	0.005% max
Water Insoluble Matter	0.05% max
Arsenic (As) Content	0.0001% max
Heavy Metals (as Pb)	0.001% max
pH (1% Solution)	4.0 - 4.8
Appearance	White Crystalline Powder

Applications

Sodium Metabisulfite plays a critical role in mineral processing operations:

Depressant for pyrite, pyrrhotite and other sulfide minerals in flotation circuits
Deoxidizer in gold cyanide leaching to prevent cyanide decomposition
Oxygen scavenger in mine water treatment systems
Preservative and antioxidant in chemical processing
Bleaching agent in textile and paper industries

Packaging & Delivery

25kg net weight per woven bag with PE liner
500kg / 1000kg jumbo bags available
25MT per 20ft FCL (palletized)
Custom packaging available upon request

Documentation

Certificate of Analysis (COA) per batch
Material Safety Data Sheet (MSDS)
Commercial Invoice & Packing List
Bill of Lading / Air Waybill
Certificate of Origin (if required)

Safety & Handling

Storage

Store in a cool, dry, well-ventilated area
Keep containers tightly closed when not in use
Avoid contact with acids, oxidizers and moisture
Shelf life: 12 months from production date

Precautions

Wear protective gloves, goggles and mask when handling
Avoid inhalation of dust and contact with skin/eyes
Releases SO₂ gas when in contact with acids
Refer to MSDS for complete safety information

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