Method of selectively removing selenium ions from an aqueous solution
US4806264A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Sep 1, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/902
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of selectively removing selenium ions from an aequeous solution containing selenium ions comprises contacting the solution with an amount of ferrous ion effective to reduce the selenium ions to elemental selenium. The contacting is preferably conducted at a pH of about 9 and the ferrous ions are preferably provided in situ in the form of ferrous hydroxide. The method may further comprise removing ferric oxides to which the ferrous ions are oxidized, these ferric oxides containing the elemental selenium produced by the reduction of the selenium ions, and separating the ferric oxides from the elemental selenium by adding a strong acid thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.