Heap bioleaching process for the extraction of zinc
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United States of America Patent
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May 18, 2004
Grant Date -
May 15, 2003
app pub date -
Nov 23, 2001
filing date -
Jul 13, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of extracting zinc from a sulphidic ore is provided which comprises bioleaching the ore in a heap with acidophilic microorganisms to produce a pregnant leach solution which is recovered from the bottom of the heap. An integrated process which comprises subjecting the pregnant leach solution to neutralization and solvent extraction to produce a concentrated zinc solution is also provided. Zinc may be recovered from the concentrated solution by means of electrowinning, either in the absence or presence of manganese. Alternatively zinc may be recovered in the form of a zinc compound.
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