Pressure leaching of nickel and cobalt sulphides with chlorine under controlled redox potential conditions
US5595642A · kind A · utility
6Cited by
6References
14Claims
0Family size
Inventors
Key dates
| Filing date | Nov 16, 1995 |
| Grant date | Jan 21, 1997 |
| Priority date | — |
| Expiry date | Nov 16, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of pressure leaching nickel and cobalt from sulphidic precipitates is provided, wherein such precipitates are leached with chlorine at a controlled redox potential of between 400 and 550 mV (Ag/AgCl), catalysed by copper, and at a temperature of between 120.degree. and 160.degree. C., to dissolve at least 80% of cobalt and to oxidize less than 10% of sulphur to sulphate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.