Silver removal apparatus and method
US4331473A · kind A · utility
16Cited by
8References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 21, 1981 |
| Grant date | May 25, 1982 |
| Priority date | — |
| Expiry date | May 21, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31692
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Silver is recovered from solutions such as photographic fixer solutions by contacting the solution with a metallic exchange medium. The metallic exchange medium comprises a plurality of buoyant elements, each comprising a substrate coated with iron. The substrate can be expanded polystyrene beads and the iron can be sponge iron of small particle size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.