Hydrometallurgical process for recovering silver from copper-ele

Details Hydrometallurgical process for recovering silver from copper-ele Hydrometallurgical process for recovering silver from copper-ele

1986-01-14

1987-05-19

Doll, John

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

423 22, 423 38, 423 39, 423 40, 423 46, 423 87, 423150, 423491, 423508, 75 97A, 75101R, 75114, 75115, 75117, 75119, 75120, 75121, 204111, C22B 1104

Patent

active

046665145

ABSTRACT:
A hydrometallurgical process for recovering pure silver from sludge formed at the anode in copper electrolysis and other sources comprises suspending the sludge, after removing Pb, Ni, and Cu, in hydrochloric acid, subsequently adding an alkali metal hypochlorite, preferably NaOCl, to the resulting suspension to convert the silver present to AgCl, filtering to separate the AgCl containing solid residue from the filtrate containing the other metallic elements, and finally working up the AgCl containing residue to obtain high purity silver. Preferably the high purity silver is obtained from the AgCl containing residue by leaching with an alkaline ammoniacal solution to dissolve the silver as the soluble silver diamine chloride, and subsequently reducing the silver diamine chloride to silver metal. The reducing agent for the silver diamine chloride is preferably either a Cu.sup.+ containing compound such as CuCl or a metal powder such as copper or bronze powder.

REFERENCES:
patent: 2060539 (1936-11-01), Spies
patent: 3594157 (1971-07-01), Hendrickson et al.
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

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