Hydrometallurgical copper recovery process
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United States of America Patent
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Issued Date -
Oct 14, 2004
app pub date -
Apr 14, 2003
filing date -
Apr 14, 2003
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Abstract
The invention provides processes for recovering copper metal from sulphide minerals via basic copper sulphate which is produced by pressure oxidation in chloride spiked sulphate solutions. Chloride contaminants in the basic copper sulphate obtained from the pressure oxidation reaction are removed in a reaction with an alkali, such as CaO. Thereafter, the basic copper sulphate is leached with a weak acid, and the resultant pregnant copper solution contains chloride ions at low concentrations, which allow copper electrolysis to operate efficiently.
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