Process for the production of high purity copper metal from primary or secondary sulphides
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United States of America Patent
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Dec 12, 2000
Grant Date -
N/A
app pub date -
Apr 14, 1998
filing date -
Apr 14, 1997
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Abstract
This process treats copper concentrates, either in the form of a primary sulfide, such as chalcopyrite, or a secondary sulfide, such as chalcocite and covellite, to obtain high purity copper metal having not less than 99.99% purity. In the case of a primary sulfide, the copper concentrate is subjected to leaching and is transformed into cement or a precipitated sulfide. In the case of the secondary sulfide, the copper concentrates are subjected to leaching with ferric fluoborate and fluoboric acid. Subsequent to leaching, the solution is subjected to copper electrowinning in a diaphragm cell to deposit copper on the cathode of the diaphragm cell.
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