Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1993-03-22
1994-05-31
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75726, 75740, C22B 100
Patent
active
053165675
ABSTRACT:
A process for the extraction of copper from a sulphide copper ore or concentrate comprises the steps of subjecting the ore or concentrate to agitation leaching at an elevated temperature and pressure to obtain a resulting acidic leach liquor containing dissolved copper and reducing the acidity of the resulting acidic leach liquor by effecting percolation leaching of a bed of low-grade copper ore or granular rock with the acidic leach liquor. The agitation leaching is carried out in two stages, i.e. a first leaching step at an elevated temperature and pressure in the presence of oxygen and an acidic chloride solution as lixiviant and a second leaching step at atmospheric pressure with an acidic sulphate solution. In a preferred embodiment, the bed of low-grade copper ore or granular rock is in the form of a heap and the percolation leaching comprises heap leaching. Copper is extracted from the leach liquor by solvent extraction. Solvent extraction is effected either before or after the heap neutralization leach depending on the nature of the copper ore or concentrate being treated.
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Cominco Engineering Services Ltd.
de Kock Elbie R.
Rosenberg Peter D.
Uren John R.
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