Metallurgical apparatus – Having means for leaching and subsequently precipitating a...
Patent
1986-08-27
1988-07-05
Stoll, Robert L.
Metallurgical apparatus
Having means for leaching and subsequently precipitating a...
266168, 266170, 75101R, 75105, 75108, 75109, 75118R, 423 27, 423 29, 423 30, 423 31, C22B 1104
Patent
active
047549530
ABSTRACT:
In gold and/or silver cyanide leaching-adsorption processes employing solid adsorbents such as activated charcoal, the overall efficiency in the recovery of gold and/or silver from ores or the like is greatly increased by contacting the cyanide slurry containing the gold and/or silver, with oxygen gas instead of normal air. A generally pure oxygen gas can be bubbled into a vessel containing the slurry, and a cover (e.g. a floating cover) may be provided on the vessel to reduce the oxygen transfer out of the solution and to facilitate pressurization of the system with an oxygen atmosphere. The procedures of the invention are applicable to carbon-in-pulp (CIP), and carbon-in-leach (CIL) processes and related processes using resins. Deaeration of the ore slurry can be practiced prior to the introduction of the oxygen.
REFERENCES:
patent: 4251352 (1981-02-01), Shoemaker
patent: 4331472 (1982-05-01), King, Jr.
patent: 4416774 (1983-11-01), Taylor
patent: 4457495 (1984-07-01), Eder et al.
Brison Robert J.
Elmore Carl L.
Mitchell Phillip
Kamyr Inc.
Stoll Robert L.
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