Zinc recovery by chlorination leach
US3973949A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1975 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Feb 13, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B19/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A pollution-free process for the recovery of high purity zinc from zinc containing material including sulfide ores which provides for maximum conservation and re-use of reagents, the process consisting of chlorinating the materials either with ferric chloride or chlorine gas followed by selective removal of metals other than zinc by standard procedures, such as, lead chloride crystallization, cementation, etc. to produce a solution containing essentially only zinc chloride and ferrous chloride. To enhance the purity of the zinc end product zinc chloride is separated from the ferrous chloride solution with a zinc selective extraction agent from which the zinc chloride is stripped with sodium chloride solution in a sodium chloride stripping circuit followed by precipitation of zinc as the carbonate. The sodium chloride formed in precipitating zinc carbonate with sodium carbonate goes to an electrolytic cell to produce chlorine and sodium hydroxide by electrolysis which latter is carbonated to sodium carbonate for circulation to the zinc carbonate precipitation. The sodium chloride stripping circuit includes the electrolytic cell where excess chlorine is removed from the stripping sol…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.