Recovery of platinum group metals (PGM) from acidic solutions by reduction precipitation with sodium borohydride
US5304233A · kind A · utility
10Cited by
3References
26Claims
0Family size
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Key dates
| Filing date | Jan 30, 1991 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Jan 30, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method is disclosed for the direct recovery of platinum group metals (PGM) from thiourea solutions or highly acidic aqueous solutions in general, such as leach solutions resulting from the acid leaching of precious metal bearing material. The method comprises reduction precipitation of the PGM from solution by alkali metal borohydride (preferably sodium or potassium borohydride) addition thereto at ambient temperature and pressure. The resulting precipitate is readily filtrable to give a product comprising high purity platinum group metal powder. The barren solution can be recycled to the upstream process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.