Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1986-07-17
1988-03-01
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204106, 204130, 204257, 204263, 75101BE, 423 24, C25C 112
Patent
active
047284021
ABSTRACT:
An electrolytic silver refining process in which crude silver is anodically dissolved and refined silver is cathodically deposited and at the same time accompanying metals are selectively extracted from the spent electrolyte and separately cathodically deposited after having been transferred into an aqueous phase and the regenerated electrolyte stripped of accompanying metals is recycled to the refining process and in which further the spent electrolyte is anodically enriched in silver and accompanying metals are cathodically deposited from the aqueous phase in a joint electrolysis step. The invention resides in that the joint electrolysis step is carried out in a diaphragm cell in which a diffusion zone is provided between one each cathode and one each anode and separated from the anode zone by an anionic separating membrane and from the cathode zone by a cationic separating membrane and that the diaphragm cell is charged via the diffusion zone with accompanying metal extract, of preferably controlled acid content, and that the apparatus for carrying out said process is preferably provided with an acid trap through which the accompanying metal extract flowsk in particular a diffusion dialyzer, which is arranged before the inlet of the accompanying metal extract into the diaphragm cell.
REFERENCES:
patent: 2723229 (1955-11-01), Bodamer
patent: 3224873 (1965-12-01), Swanson
patent: 3975244 (1976-08-01), Hunter
patent: 4212714 (1980-07-01), Coker et al.
patent: 4443305 (1984-04-01), Haynes
Andrews R. L.
Ogussa Osterreichische Gold- und Silber-Scheideanstalt Scheid un
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