Electrolytic oxidation of blix solution
AssigneeFuji Photo Film Co., Ltd.
InventorsYoshio Idota, Haruhiko Iwano, Kazuo Shirasu, Sachio Matsushita
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Abstract
A process for electrolyzing a bleach-fixed solution, or blix solution, used in processing color photographic materials, which contains originally an iron (III) chelate compound and a silver halide solvent in an electrolytic bath and separating the cathode compartment and the anode compartment of the electrolytic cell with a porous membrane and controlling the anode potential so that the silver halide solvent does not decompose. Embodiments include use of a carbon fiber as the anode and also controlling the cathode potential and the current densities of the cathode and the anode.
Claims14
A process for electrolyzing a used blix solution obtained in processing color photographic materials, said blix solution originally containing an iron (III) chelated bleaching agent and a silver halide solvent, comprising,
- providing an electrolytic cell having a cathode compartment and an anode compartment having a liquid flow path therebetween and separated by a porous membrane;
- feeding into said cathode compartment at a flow rate of 3 liters/hour or more said blix solution;
- applying to the cathode of said electrolytic cell a potential of from about -0.20 to about -0.7 volts and to the anode a potential of about -0.10 to 0.50 volts while passing said blix solution from the cathode compartment to the anode compartment and controlling the cathode potential, anode potential and the current densities of said anode and cathode so as not to decompose the silver halide solvent.
Dependencies are inferred from the claim text.