Recovery of precious metals
US4895597A · kind A · utility
31Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1989 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Jan 23, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Recovery of precious metals such as gold and silver from aqueous cyanide solutions thereof, by contact with a reagent containing a guanidine functionality. The guanidine reagent extracts the precious metal from the aqueous solution which is subsequently stripped from the guanidine reagent and recovered by conventional methods. Certain novel guanidine compounds suitable for extracting gold and silver are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.