Process for the recovery of silver values from silver-containing material which also contains iron and arsenic
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United States of America Patent
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May 25, 1982
Grant Date -
N/A
app pub date -
Aug 19, 1980
filing date -
May 30, 1980
priority date (Note) -
Expired
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Abstract
A process for the recovery of silver values from silver-containing material which also contains iron and arsenic includes leaching the material under oxidizing conditions at elevated temperature and pressure in aqueous nitric acid solution to dissolve a substantial amount of silver together with substantial amounts of arsenic, iron and other metals if present. The resultant leach solution is separated from undissolved leach residue and treated with a solution containing chloride ions to selectively precipitate substantially all dissolved silver as silver chloride without significant co-precipitation of other dissolved metals. The silver chloride precipitate is then separated from the remaining solution.
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