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U.S. Department of Energy
Office of Scientific and Technical Information

Process for purifying silver refinery slimes

Patent ·
OSTI ID:5331954
In a process for the recovery of precious metals by the nitric acid leaching of silver refinery slimes containing gold, silver, palladium, platinum, selenium and tellurium wherein silver is dissolved and separated leaving a gold sand residue containing gold, undissolved silver and impurities comprising palladium, platinum, selenium and tellurium, the improvement is described comprising: contacting the gold sand with hydrochloric acid for a sufficient time to selectively leach silver, palladium, platinum, selenium and tellurium from the gold sand while leaving gold in the gold sand residue.
Assignee:
ASARCO Inc., New York, NY
Patent Number(s):
US 4722831
OSTI ID:
5331954
Country of Publication:
United States
Language:
English