Extraction of precious metals from ores and other precious metal containing materials using halogen salts
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United States of America Patent
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Jul 12, 1994
Grant Date -
N/A
app pub date -
Jan 26, 1993
filing date -
Jan 26, 1993
priority date (Note) -
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Abstract
Platinum group metals, gold and silver are extracted from complex ores, automobile scrap, refractory ores and as naturally occurring by leaching the precious metal containing materials with a solution containing halogen salts such as potassium or sodium iodide and bromide in the presence of ammonium ions and oxygen. The precious metal containing materials and reactants are charged into a reaction zone held at high temperatures and pressures to form a slurry containing a precious metal ion solution. The precious metal ion solution is separated from the slurry and subjected to recovering techniques to recover the precious metals.
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