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1. (WO1991009159) METHOD FOR RECOVERING SILVER FROM A PHOTOGRAPHIC FIXING SOLUTION
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/009159 International Application No.: PCT/EP1990/002110
Publication Date: 27.06.1991 International Filing Date: 04.12.1990
Chapter 2 Demand Filed: 12.06.1991
IPC:
C25C 1/20 (2006.01)
C CHEMISTRY; METALLURGY
25
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
C
PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
1
Electrolytic production, recovery or refining of metals by electrolysis of solutions
20
of noble metals
Applicants:
EASTMAN KODAK COMPANY [US/US]; 343 State Street Rochester, NY 14650, US (AT, AU, BE, CA, CH, DE, DK, ES, FR, GR, IT, JP, LU, NL, SE)
KODAK LIMITED [GB/GB]; Kodak House Station Road Hemel Hempstead Herts HP1 1JY, GB (GB)
FYSON, John, Richard [GB/GB]; GB (UsOnly)
Inventors:
FYSON, John, Richard; GB
Agent:
F.J. CLEVELAND & COMPANY; 40/43 Chancery Lane London WC2A 1JQ, GB
Priority Data:
8927964.011.12.1989GB
Title (EN) METHOD FOR RECOVERING SILVER FROM A PHOTOGRAPHIC FIXING SOLUTION
(FR) PROCEDE DE RECUPERATION D'ARGENT D'UNE SOLUTION DE FIXAGE PHOTOGRAPHIQUE
Abstract:
(EN) Silver is able to be recovered from a photographic fixing solution by circulating the solution through a unit separate from, but connected to, a main unit. In the separate unit the solution is subjected to electrolysis by anodic and cathodic electrodes. The density of the current is limited to 100 A/m2 and the voltage is controlled up to a maximum of 1.4 V. The supply of current and voltage is self-regulating within these limits so that no deposits of sulphide from the solution being treated occurs.
(FR) On peut récupérer de l'argent d'une solution de fixage photographique en faisant circuler la solution dans une unité séparée d'une unité principale, mais reliée à celle-ci. Dans l'unité séparée, on soumet la solution à une électrolyse à l'aide d'électrodes anodiques et cathodiques. On limite la densité du courant à 100 A/m2 et on règle la tension jusqu'à une limite maximale de 1,4 volts. L'alimentation en courant et en tension est autorégulée à l'intérieur de ces limites de sorte qu'aucun dépôt de sulfure de la solution n'ait lieu.
Designated States: AU, CA, JP, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0504190US5300199JPH05502476CA2070998DE000069026956AU1991068807