Recovery of platinum group metals and rhenium from materials using halogen reagents
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United States of America Patent
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Aug 6, 1996
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N/A
app pub date -
Jan 27, 1995
filing date -
Jan 27, 1995
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Expired
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Abstract
Platinum group metals and rhenium are extracted from their elemental state, complex ores, and other materials such as catalysts by leaching them with a solution containing ammonium halogen salts--iodide and bromide in the presence oxygen and/or sulfuric acid. The invented process is particularly effective for spent catalysts containing precious metals and rhenium in an autoclave at a temperature of 50.degree. C.-300.degree. C.
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