C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/230
C22B 11/08 (2006.01)
Patent
CA 1332110
ABSTRACT A process for leaching gold and silver from ores and ore concentrates is disclosed using a cyanide leaching solution and hydrogen peroxide and maintaining an oxygen concentration of 2 to 20 Mg of O2/liter. In the invention, leaching takes place in the presence of decomposition catalysts and preferably the formed cyano-complexes are separated during leaching from the leach solution. Decomposition catalysts are manganese compounds, present as 0.01 to 1 mg computed as Mn/liter of barren solution, or 1 to 50 mg computed as Mn per kg of ore slurry, or they are inorganic or organic polymers or carbon. Activated charcoal is preferred and simultaneously adsorbing cyano-complexes of precious metals. The process offers lowered consumption of H2O2 and possibly cyanide and maximum gold yield in a shortened leaching time.
610737
Gos Steven
Knorre Helmut
Lorosch Jurgen
Stoll Mathias
Ziegler Annette
Aktiengesellschaft Degussa
Marks & Clerk
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