Removal and recovery of silver from waste stream
US4744825A · kind A · utility
11Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1986 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Dec 4, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In accordance with the invention, an improved process is provided for the efficient removal and recovery of silver from an impure solution containing silver ions which comprises contacting the silver-containing solution with an activated alumina adsorbent to selectively adsorb the silver ions from the solution and the lower the subsequent effluent discharge to less than 1 ppm silver, treating the activated alumina with a regeneration fluid to recover the silver ions from the adsorbent, and reducing the recovered silver ions to metallic silver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.