Process for recovering precious metals from sulfide ores
US5074910A · kind A · utility
8Cited by
41References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1990 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | Feb 28, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B11/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention is a process to recover precious metals from sulfide ores. It involves chlorinating a mixture of an ore concentrate and salt to form a liquid melt. The salt preferably contains potassium chloride. This chlorination is carried out at a temperature between 300.degree. and 600.degree. C. while stirring. The process converts precious metals in the elemental and sulfide forms into precious metal chlorides which are recovered by subsequent processing steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.