Aluminum containing precipitating agent for precious metals...

Details Aluminum containing precipitating agent for precious metals... Aluminum containing precipitating agent for precious metals...

C - Chemistry, Metallurgy

22

B

53/168, 53/235

C22B 11/08 (2006.01) C22B 5/04 (2006.01)

Patent

CA 1090584

ABSTRACT A precipitating agent for precipitating precious metals such as gold from aqueous cyanide solution of the precious metal ions includes aluminum powder and a reducing agent such as sodium hydrosulfite, sodium borohydride or hydrazine. The precipitating agent may also include an alkali metal carbonate, such as potassium carbonate, as an activaator. The precipitating agent efficiently reduces the precious metal ions to elemental metal for recovery and also consumes a portion of the cyanide content, which is often high in such solutions. The method of use includes adjusting the precious metals cyanide solution to a high pH, adding the precipitating agent with agitation, prefer- ably in incremental portions of the amount required. The solution is allowed to stand to permit the precipitated metal to settle, and the metal is separated from the solution.

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