Separation of precious metals by an ion exchange process
US5256187A · kind A · utility
14Cited by
15References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1992 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Nov 12, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to the extraction and separation of low concentrations of precious group metals from acid chloride solutions, which are obtained by leaching catalytic converters, by utilizing a 8-hydroxyquinoline containing resin and a thiourea stripping process. The said process eliminates the phase separation problems and reagent losses which are normally associated with prior art methods. In addition to being used as a catalytic converter recycler, the present invention can be also employed by waste water treatment plants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.