Electrolytic desilvering method
US5554270A · kind A · utility
1Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1993 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | Nov 12, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to an electrolytic desilvering method for photographic effluents. This method is carried out in an electrolytic cell comprising at least one anodic compartment and at least one cathodic compartment. The photographic effluent is treated in the cathodic compartment of the cell in order to reduce the silver ions in solution. The electrolyte is then recycled in the anodic compartment before being discharged to the sewer. This recycling in the anodic compartment allows to discharge to the sewer an effluent having a silver content less than 20 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.