Continuous method for removing copper from lead
US4390363A · kind A · utility
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4References
10Claims
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Assignee
Inventor
Key dates
| Filing date | Jun 11, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Jun 11, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B13/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A continuous method and apparatus for removing copper from lead comprises introducing molten lead and sulphur to the upper end of a vertical stirred reaction vessel, maintaining a dispersion of sulphur in the lead without substantial back-mixing and thereafter recovering the dispersion and allowing the formed copper sulphide to float to the surface. The process is suitable for continuous operation on a small scale, e.g. 3 tons per hour, is environmentally acceptable and requires a lead inventory only about one third of that required by conventional batch processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.