Method for processing anode sludge
US7731777B2 · kind B2 · utility
0Cited by
7References
24Claims
0Family size
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Key dates
| Filing date | Aug 31, 2004 |
| Grant date | Jun 8, 2010 |
| Priority date | — |
| Expiry date | Jun 27, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a hydrometallurgical method for separating the precious metals and impurities of anode sludge obtained from copper electrolysis. According to the method, anode sludge copper is separated in atmospheric leaching; calcinated in two steps for separating selenium and for sulfatizing silver; the sulfatized silver is separated by leaching into a neutral aqueous solution, from which it can be separated by reduction or by extraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.