Leaching process for zinc sulphide containing materials
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United States of America Patent
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Jun 23, 1981
Grant Date -
N/A
app pub date -
Jan 18, 1980
filing date -
Jan 24, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for treating zinc sulphide materials wherein the sub-divided material is firstly leached, at less than 119.degree. C., with a sulphate leach solution, low in sulphuric acid and having a high iron content together with zinc and impurities in a manner causing iron to precipitate and subsequently leaching the residue and re-dissolving the iron precipitate with spent electrolyte containing regenerated sulphuric acid resulting from the treatment of the leach liquor obtained from the first leach step and wherein the leach solution from the subsequent leach step constitutes the starting leach solution for the first leach step.
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