Method for thiosulfate leaching of precious metal-containing materials
US7559974B2 · kind B2 · utility
16Cited by
78References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2007 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | Oct 29, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.