Pressure leaching of nickel and cobalt sulphides with chlorine under controlled redox potential conditions
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United States of America Patent
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Jan 21, 1997
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app pub date -
Nov 16, 1995
filing date -
Dec 1, 1994
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Abstract
A method of pressure leaching nickel and cobalt from sulphidic precipitates is provided, wherein such precipitates are leached with chlorine at a controlled redox potential of between 400 and 550 mV (Ag/AgCl), catalysed by copper, and at a temperature of between 120.degree. and 160.degree. C., to dissolve at least 80% of cobalt and to oxidize less than 10% of sulphur to sulphate.
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