Agfa Gevaert Nv

Agfa-gevaert

Paul Smet

Werner J Van De Wynckel

Frank P Michiels

Benedictus J Jansen

Benny Jansen

Patrick Albert Mertens

Guy Damen

Fernand I Ketels

Michiels Frank

An apparatus for desilvering silver-containing solutions comprises an electrolytic cell (10) having an anode (20), a cathode (30) and a reference electrode (45) positioned adjacent the cathode (30), and electrical power supply control means (41) for controlling the supply of electrical power to the anode (20) and the cathode (30). The power supply control means (41) includes means (60) for adjusting the cathode potential and control means (70) linked to said adjustment means (60) to reduce the cathode potential, at least periodically, as the desilvering process continues. The process leads to better silver adhesion on the cathode occurs, while maintaining good desilvering levels in the solution, and cathode poisoning is minimised.

Process and apparatus for desilvering a silver-containing solution

A silver-containing solution is de-silvered in an electrolytic cell having an anode and a cathode. The diffusion limitation current density of the electrolytic cell is estimated by measuring a current flow there-through and silver is deposited on the cathode at a de-silvering current density which is lower than the diffusion limitation current density.

Process for de-silvering of a silver-containing solution

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Wilrijk, Belgium

Paul Smet