Process for recovery of gold from refractory gold ores using sulfurous acid as the leaching agent
US5147618A · kind A · utility
30Cited by
11References
52Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 1991 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | May 21, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for recovering gold from refractory gold-bearing ores uses sulfurous acid as the leaching agent to form a gold-sulfite complex. The ore is ground, slurried blended with a chelating agent and then subjected to a simultaneous dissolved SO.sub.2 leaching and anion exchange resin adsorption step in the presence of dissolved oxygen. The gold transfers to the resin which is later separated from the resin by chemical stripping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.