Recovery of zinc from sulphidic concentrates
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United States of America Patent
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Jul 29, 1997
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N/A
app pub date -
Nov 7, 1995
filing date -
Nov 8, 1994
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Abstract
There is provided a novel class of additives, specifically coals, which are useful in zinc extraction processes involving one or more pressure leach stages carried out at temperatures above the melting point of sulphur. Such processes may include those incorporating a single stage pressure leach, a process involving two stage countercurrent or cocurrent pressure leaches or a multistage leach process for recovering zinc, lead and silver from zinc bearing sulphidic materials which also contain lead and silver.
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