Recovery of spent pickle liquor and iron metal
US4149946A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1978 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Mar 21, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Spent sulfuric acid pickle liquor containing ferrous ion is regenerated and iron metal is recovered therefrom by electrolysis in a cell having an anode in an anode chamber and a cathode in a cathode chamber separated by a cation-selective membrane. The spent pickle liquor is placed in the cathode chamber, aqueous ammonium sulfate solution is placed in the anode chamber, and electrical current is passed through the cell. Iron plates out on the cathode. Ammonium ion passes through the membrane into the cathode chamber to form aqueous ammonium sulfate solution therein, and the ammonium sulfate anolyte is converted to sulfuric acid solution useful for pickling. Ammonium sulfate solution from the cathode chamber is recycled to the anode chamber and the process is repeated with fresh spent pickle liquor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.