Process for recovering silver from residues containing silver an

Details Process for recovering silver from residues containing silver an Process for recovering silver from residues containing silver an

1976-06-11

1978-11-28

Ozaki, G.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

75108, 75114, 75117, 75118R, 75120, 423 39, 423 92, 423101, 423140, 423561R, 423 48, C22B 1106

Patent

active

041276396

ABSTRACT:
Aqueous lead solutions obtained by hot chloride leaching of residues containing lead and silver ore are subjected to selective precipitation of the silver as silver sulphide, with e.g. hydrogen sulphide. The silver can then be recovered in a known manner. Lead can be precipitated from the remaining solution as a basic salt also in a known manner. If the initial residue contains copper, it is also precipitated as sulphide. The copper sulphide can be separated from the precipitate by selectively dissolving the copper with sulphuric acid under an elevated oxygen pressure. Elemental sulphur is formed and the silver sulphide can be separated from the elemental sulphur in a known manner.

REFERENCES:
patent: 295887 (1884-03-01), Russell
patent: 561544 (1896-06-01), Dewey
patent: 900452 (1908-10-01), Wadhams et al.
patent: 3969107 (1976-07-01), Lippert et al.
Handbook of Chemistry and Physics, 1973-1974, pp. B-102, 135 and 232.

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