Recovery of gold from solution
AssigneeOutotec (Finland) Oy
InventorMika Haapalainen
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Abstract
A method is disclosed for recovering gold from a gold-containing organic solution containing soluble gold. The method comprises contacting the gold-containing organic solution with an aqueous stripping solution in order to extract gold from the gold-containing organic solution into the aqueous stripping solution. The aqueous stripping solution containing gold is separated from the organic solution. The separated aqueous stripping solution containing gold is contacted with a reducing agent containing sodium metabisulphite, in order to reduce gold from the aqueous stripping solution.
Claims11
A method for recovering gold from a gold-containing organic solution containing soluble gold, wherein the method comprises
- contacting a pregnant leach solution containing gold with a gold extraction reagent containing organic diester and organic alcohol to obtain the gold-containing organic solution;
- contacting the gold-containing organic solution with an aqueous stripping solution to extract gold from the gold-containing organic solution into the aqueous stripping solution;
- separating the aqueous stripping solution containing gold from the organic solution;
- contacting the separated aqueous stripping solution containing gold with a reducing agent containing sodium metabisulphite to reduce gold from the aqueous stripping solution;
- wherein the aqueous stripping solution contains sodium chloride, and wherein the aqueous stripping solution is weakly acidic so that the gold remains soluble in the aqueous stripping solution.
Dependencies are inferred from the claim text.