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Processing/reducing chemical

Sodium Metabisulfite (SMBS)

A reducing agent and SO2 source used in gold processing (notably cyanide destruction) and as a general-purpose reductant and preservative.

Product codeSMBS
Purity / spec97% min SO2 content
AppearanceWhite to pale yellow crystalline powder, characteristic SO2 odour
Packaging25 kg bags or 1,000 kg bulk bags
What it is

Chemical properties

SMBS releases sulphur dioxide in solution, making it useful both as a reducing agent and as an oxygen scavenger in aqueous processes.

Application

How it’s used

Widely used in the INCO SO2/air process for cyanide destruction in gold tailings, and as a reducing agent in various metallurgical and water-treatment duties.

Used with / for
  • Gold processing (cyanide destruction)
  • General metallurgical reduction duties
Storage & handling

Store dry and sealed; degrades on exposure to moisture and air, releasing SO2.

Safety

Releases irritant SO2 gas on contact with acid or moisture; SDS provided. Full Safety Data Sheet (SDS) supplied with every consignment.

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