Method of producing a higher-purity metal
US6896788B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2001 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Feb 8, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25C1/16
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of producing a higher purity metal comprising the step of electrolyzing a coarse metal material by a primary electrolysis to obtain a primary electrodeposited metal, the step of electrolyzing the material with the primary electrodeposited metal obtained in the primary electrolysis step used as an anode to obtain a higher purity electrolyte for secondary electrolysis, and the step of further performing secondary electrolysis by employing higher purity electrolytic solution than said electrolytic solution with said primary electrodeposited metal as an anode, whereby providing an electro-refining method that effectively uses electrodes and an electrolyte produced in a plurality of electro-refining steps, reuses the flow of an electrolyte in the system, reduces organic matter-caused oxygen content, and can effectively produce a high purity metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.