Processes for the recovery of copper from aqueous solutions containing nitrate ions
US6702872B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1999 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Jul 8, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the recovery of copper from a copper-containing aqueous acid leach solution containing nitrate ions, in which the leach solution is contacted with a solution of an oxime extractant in a water-immiscible organic solvent, which comprises utilizing at least one of the following process variants:I) using an oxime extractant in the organic solution consisting of oximes selected from the group consisting of at least one ketoxime, and a mixture of at least one ketoxime and at least one aldoxime wherein the ketoxime:aldoxime molar ratio is in the range of from 1:0 to about 1:1.2II) wherein the organic solution does not contain any modifiers or kinetic additives for the oxime extractant;III) reducing the acidity of the acid leach solution to a pH in the range of from about 2.25 to about 3.1, preferably from 2.25 to 2.7, prior to contact with the organic solution; andIV) reducing the electromotive force in the leach solution to less than about 550 mV prior to contact with the organic solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.