Reductants for reducing metals in acid media
US4374805A · kind A · utility
5Cited by
8References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1980 |
| Grant date | Feb 22, 1983 |
| Priority date | — |
| Expiry date | May 7, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Metals such as iron, uranium, vanadium, molybdenum and rare earths are reduced to lower oxidation states in various acid media using silicon metal or an iron-silicon alloy. In particular, ferric iron and hexavalent uranium in wet-process phosphoric acid are reduced to the ferrous and tetravalent states, respectively, using silicon metal or an iron-silicon alloy to provide a feed acid which is suitable for extraction with an extractant which is selective for tetravalent uranium such as a mixture of mono- and di-(alkylphenyl) esters of orthophosphoric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.