Method for leaching copper concentrate
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United States of America Patent
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Aug 16, 2005
Grant Date -
Apr 1, 2004
app pub date -
Dec 11, 2001
filing date -
Dec 20, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a method where sulfidic iron-bearing copper concentrate is leached on the countercurrent principle, in a chloride environment. The leaching takes place with the aid of bivalent copper and an oxygen-bearing gas as a multi-stage continuous process, under normal pressure, at a temperature, which as highest corresponds to the boiling point of the solution. Part of the insoluble solid matter is returned, counter to the main flow of solid matter, to one of the previous leaching stages or reactors where, as a result of the extended leaching time, the leach waste iron is recovered mostly as hematite.
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