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Original Articles

The Desilvering of Bleach-Fix Solutions by Electrolysis

Pages 13-18 | Received 13 Nov 1971, Published online: 23 Jul 2016
 

Abstract

Electrode potential measurements indicated that silver deposition is the main reaction occurring at the cathode during the electrolysis of used bleach-fix solutions. The very low plating efficiency of the recovery of silver by electrolysis appears to be caused mainly by the dissolution of the silver on the cathode by the bleach-fix solution. Some improvement in plating efficiency was obtained by placing the electrodes in seperate cells.

Abrégé

Les mesures de potentiel d’électrode ont montré que Ie dépôt d’argent est la principale réaction qui se produit à la cathode lors de I’électrolyse des solutions usagées de blanchimentfixage. Le mauvais rendement de la récupération de I’argent par électrolyse semble provenir principalement de I’attaque par la solution de blanchirnent-fixage de I’argent déposé sur la cathode. Le rendement du dépôt peut étre amélioré quelque peu en plaçant les électrodes dans des cellules séparées.

Zusammenfassung

Messungen des Elektrodenpotentials zeigen, dass die Silberabscheidung an del’ Kathode die Hauptreaktion während del’ Elektrolyse gebrauchter Bleichfixierlösungen ist. Die ehr geringe Abscheidungsau beute bei del’ Wiedergewinnung von Silber durch Elektrolyse scheint hauptsächlich daraufzu beruhen, dass sich das Silber in del’ Bleichfixierlösung an del’ Kathode löst. Eine verbesserte Ausbeute wurde erhallen, wenn man die Elektroden in getrennten Zellen unterbrachte.

Sommario;

Misure di potenziale all’elettrodo indicano che la deposizione dell’argento é la reazione più importante che avviene al catodo durante I’elettroli i di soluzioni per sbianca e fissaggio esaurite.

La bassa efficienza di deposizione nel recupero dell’argento mediante elettrolisi sembra essere causata soprattutto dalla dissoluzione dell’argento suI catodo da parte della soluzione di sbianca fissaggio.

Alcuni migJioramenti sull’efficienza di deposizione sono stati otten uti quando gli elettrodi sono posti in celie separate.

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