High-purity Sodium Metabisulfite (SMB) used for gold precipitation during the aqua regia refining process. This 5 lb resealable bag contains refining-grade Na₂S₂O₅, widely used by gold refiners, jewelers, and metal recovery professionals to recover dissolved gold from solution.
Sodium Metabisulfite is commonly added after filtration of the aqua regia solution to precipitate gold back into solid form during the refining process. This chemical is a standard reagent used in precious metal recovery and refining operations.
Chemical Name: Sodium Metabisulfite
Chemical Formula: Na₂S₂O₅
CAS Number: 7681-57-4
Purity: Refining / Reagent Grade
Net Weight: 5 lb
Appearance: White crystalline powder
Packaging: Resealable bag for convenient storage
Gold precipitation from aqua regia solutions
Precious metal recovery and refining
Scrap gold and jewelry refining
Electronic waste metal recovery
Laboratory and chemical processing
Sodium Metabisulfite is used to precipitate dissolved gold from filtered aqua regia solutions during the refining process.
The amount used will vary depending on the quantity of dissolved metal and solution concentration.
Use in a well-ventilated area
Wear appropriate protective equipment including gloves and eye protection
Store in a cool, dry place
Keep out of reach of children
Not intended for food or medical use
Ships within the United States only
Orders are carefully packaged for safe transport
Most orders ship same or next business day
Trusted by refiners, jewelers, and precious metal recovery specialists.
If you have questions about refining supplies or product compatibility, feel free to contact us.
Trusted by refiners, jewelers, and e-waste processors nationwide.
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