Hydrometallurgical process for the recovery of silver from copper electrolysis anode sludge
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United States of America Patent
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Oct 17, 1989
Grant Date -
N/A
app pub date -
Nov 2, 1987
filing date -
Oct 31, 1986
priority date (Note) -
Expired
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Abstract
Silver is recovered from an anode sludge by initially chlorinating the sludge in a slurry with nascent chlorine. The nascent chlorine is produced in situ by addition of sodium hypochlorite to the slurry in hydrochloric acid. Then the slurry is filtered and the silver containing solid phase extracted with ammonia to produce a solution from which lead is precipitated. The filtrate is then reacted with copper to precipitate silver.
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