Process for reducing Zn consumption in zinc electrolyte purification
US4439288A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1983 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Jul 11, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention contemplates treating a zinc sulfate containing solution, especially a neutral leach filtrate with a reducing agent selected from ZnSO.sub.3, SO.sub.2 or mixtures thereof to substantially reduce the oxidant therein and to obtain a solution having a predetermined pH. Thus, in one embodiment of the present invention, a neutral leach filtrate containing an oxidant selected from permanganate and manganate ions and mixtures thereof is treated with a reducing agent selected from ZnSO.sub.3, SO.sub.2 or mixtures thereof in amounts sufficient to substantially reduce all the manganese ions present (permanganate and/or manganate) to the divalent state and to provide a zinc sulfate solution for electrodeposition of the zinc having a predetermined pH.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.