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AssigneeEstorol A.G.
InventorsPhilippe A. DeMeester, Jean-Pierre J. Heraly, Pierre F. Vandenput
Estimating the term…
The process for treating a photographic fixing bath, in order to remove therefrom the silver in metallic form by electrolysis in an electrolysis cell comprising at least one cathode on which the silver is deposited, two anodes and a control electrode placed in the vicinity of the cathode, comprises the step of adjusting the intensity of the electrolysis current by measuring the potential difference between a cathode serving as a working electrode and the control electrode. The apparatus for treating a photographic fixing bath in order to remove therefrom the silver comprises an electrolytic cell containing, as electrodes, at least one cathode and anodes as well as a control electrode made of pure carbon immersed in a stirred electrolytic bath, the voltage of this control electrode being maintained at a constant reference value and the potential on this control electrode serving to control the electrolysis current in operation.
A process for treating a photographic fixing bath in order to remove therefrom silver in a metallic form, comprising stirring a photographic fixing bath, electrolyzing said bath so as to cause metallic silver to be deposited onto at least one cathode placed between anodes, regulating the current intensity in said bath by a control electrode of pure carbon placed near the cathode, in which the electrolysis current intensity is regulated due to variations encountered such as due to the silver concentration and temperature, said regulating being effected by measuring a potential difference between a cathode used as working electrode and the control electrode and by appropriately adjusting said electrolysis current intensity, as needed, in response to said measured potential difference.
An apparatus for treating a photographic fixing bath in order to remove therefrom the silver in metallic form, containing a stirred electrolyte bath, at least one cathode used as a working electrode, several anodes and a control electrode of pure carbon immersed in said electrolyte bath, and a regulating device connected to said control electrode and said cathode, the regulating device being arranged to regulate the electrolyte current through the electrolyte bath in response to the potential difference between the control electrode and said cathode.
Dependencies are inferred from the claim text.