Dichromate leach of copper anode slimes
US4076605A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1976 |
| Grant date | Feb 28, 1978 |
| Priority date | — |
| Expiry date | Aug 26, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention relates to a process for the recovery of metal values from copper refinery anode slimes composed largely of copper, selenium, insolubles, and precious metals, including silver, comprising leaching the slimes with a solution containing from 20 to 200 g/l H.sub.2 SO.sub.4 and from 2 to 25 g/l hexavalent chromium at a temperature not exceeding about 80.degree. C., whereby copper dissolution is maximized and selenium and silver dissolution are minimized, separating the leach solution from the undissolved slimes residue, precipitating selenium from the separated leach solution by treatment with metallic copper, and electrowinning copper from the resulting purified solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.