Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1992-06-16
1994-01-04
Lewis, Michael
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 31, C01G 500, C01G 700, C22B 1108
Patent
active
052757919
ABSTRACT:
A process is described for leaching gold and/or silver from ores or ore concentrates using an aqueous alkaline cyanide solution with addition of hydrogen peroxide. The addition of the aqueous H.sub.2 O.sub.2 solution is regulated and controlled through the concentration of the oxygen dissolved in the leaching solution, the leaching solution containing from 2 to 20 mg O.sub.2 and preferably from 7 to 13 mg O.sub.2 per liter. 0.5 to 5% by weight H.sub.2 O.sub.2 solutions are preferably added. The process is applicable both to leaching by agitation and to heap leaching, the addition of H.sub.2 O.sub.2 being regulated and controlled through measurement of the O.sub.2 concentration in the leaching solution and can also involve measurement in a measuring stream. Despite low consumptions of H.sub.2 O.sub.2 and NaCN, the gold yield is even increased in some cases and the leaching time shortened.
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Fischer Joachim
Griffiths Andrew
Knorre Helmut
Loroesch Juergen
Bos Steven
Degussa - Aktiengesellschaft
Lewis Michael
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