Method for precious metal recovery
US4078918A · kind A · utility
14Cited by
5References
21Claims
0Family size
Inventor
Key dates
| Filing date | Nov 26, 1976 |
| Grant date | Mar 14, 1978 |
| Priority date | — |
| Expiry date | Nov 26, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A recovery process for reclaiming precious metals from industrial process residues, such as silver chloride resulting from salt analysis of meats in a packing plant, or alternatively, from industrial waste photographic papers or the like. The process comprises pretreating the material with an oxidizing agent capable of substantially completely oxidizing organic contaminants, reacting the material with ammonium hydroxide to form a soluble amine complex, and reacting the amine complex with ascorbic acid or a salt form of ascorbic acid to provide precious metal in elemental form. The preferred process is for reclaiming silver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.