Hydrometallurgical process for the recovery of silver from coppe

Details Hydrometallurgical process for the recovery of silver from coppe Hydrometallurgical process for the recovery of silver from coppe

1987-11-02

1989-10-17

Stoll, Robert L.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75103, 75109, 75112, 75114, 75117, 75119, 75120, 75121, C22B 1104

Patent

active

048744298

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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patent: 3658510 (1972-04-01), Hoffmann et al.
patent: 4094668 (1978-06-01), Yannopoulos et al.
patent: 4342592 (1982-08-01), Lamb
patent: 4372782 (1983-02-01), Salter et al.
patent: 4439235 (1984-03-01), Simpson
patent: 4666514 (1987-05-01), Bertha

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