Recovery of precious metal
US5028259A · kind A · utility
25Cited by
1References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1991 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Mar 6, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improved process for recovery for precious metals such as gold and silver from aqueous cyanide solutions by contact with certain guanidine reagents. The guanidine reagents not only extract the precious metal but may provide advantages in selectivity of gold over other metals, such as tetra- and pentahydrocarbon substituted non-resin guanidine reagents and tri- and tetra-hydrocarbon substituted resin guanidine reagents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.