Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1992-06-19
1993-06-29
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75726, 75740, 423 27, C22B 100
Patent
active
052230244
ABSTRACT:
A process for the extraction of copper from a copper ore or concentrate comprises first subjecting the ore or concentrate to agitation leaching at an elevated temperature and pressure in the presence of oxygen and water to obtain a resulting acidic leach liquor which contains dissolved copper. The acidity of the resulting acidic leach liquor is then reduced by affecting percolation leaching of a bed of low grade copper ore or waste rock with the resulting acidic leach liquor, whereby the pH of the leach liquor is raised, for example to a value of about 1.5 to 2. In a preferred embodiment the bed of low grade ore or waste rock is in the form of a heap and the percolation leaching comprises heap leaching.
REFERENCES:
patent: 3896208 (1975-07-01), Dubeck
patent: 4017309 (1977-04-01), Johnson
patent: 4120935 (1978-10-01), Fountain et al.
patent: 4266972 (1981-05-01), Redondo-Abad et al.
patent: 4971662 (1990-11-01), Sawyer
Chapter 25.1 "Commercial Processes For Copper" from the Handbook of Solvent Extraction, J. F. C. Fisher et al., 1985.
Chapter 33 "Oxidative Leaching of a Copper-Nickel Concentrate at Elevated Temperature" from Leaching of Copper-Nickel Concentrate, B. Yawney et al.
Cominco Engineering Services Ltd.
Rosenberg Peter D.
Russell Uren John
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