Prevention of copper dissolution during cyanidation of gold ores

Details Prevention of copper dissolution during cyanidation of gold ores Prevention of copper dissolution during cyanidation of gold ores

1989-10-27

1991-10-29

Lewis, Michael L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 32, B01D 1102, C22B 1108

Patent

active

050614592

ABSTRACT:
A process for treating copper containing precious metal ores prior to cyanidation and recovery of the precious metal eg gold. The process involves addition to the ore before or after milling of a water soluble or water dispersible surface active agent in the form of a fatty alkyl amine preferably an ethoxylated fatty alkyl amine. The agent reduces the high cyanide consumption, which is caused by copper dissolution, by passivating the mineral surface.

REFERENCES:
patent: 1461807 (1923-07-01), Silver
patent: 1519396 (1924-12-01), Darrow
patent: 1549856 (1925-08-01), Darrow
patent: 1864222 (1932-05-01), Swainson et al.
patent: 2839387 (1958-06-01), Burton
patent: 4441993 (1984-04-01), Howald
patent: 4908125 (1990-03-01), Mackenzie et al.

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