Patent · US Expired

Process and apparatus for desilvering a silver-containing solution

US5770034A · kind A · utility

14Cited by

6References

19Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Benedictus Jansen · Geel, BE
Fernand Ketels · Kontich, BE
Paul Smet · Wilrijk, BE
Werner Van De Wynckel · Mortsel, BE
Michiels Frank · Arendonk, BE

Key dates

Filing date	Jul 8, 1996
Grant date	Jun 23, 1998
Priority date	—
Expiry date	Jul 8, 2016

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC25C1/20
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.