Recovery of gold
US4551213A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1984 |
| Grant date | Nov 5, 1985 |
| Priority date | — |
| Expiry date | May 7, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B11/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Gold values are recovered from mixtures thereof contained with sulfur, especially mixtures obtained from the hydrometallurgical processing of copper. The process comprises the following steps: PA0 (a) forming an aqueous suspension of the mixture containing the gold and sulfur values; PA0 (b) adjusting the chloride concentration of the suspension so that the suspension contains at least about 12 weight percent of chloride; PA0 (c) maintaining the oxidation reduction potential of the mixture in the range of about 650-750 millivolts; PA0 (d) adding cupric chloride or ferric chloride, if not already present in the mixture, in sufficient amounts to cause the gold contained in the mixture to dissolve into the solution; and PA0 (e) recovering the gold from the solution in an electrolytic cell, or by reaction with carbon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.