Preparation of rare earth nitrates
US4231997A · kind A · utility
6Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1979 |
| Grant date | Nov 4, 1980 |
| Priority date | — |
| Expiry date | Apr 5, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F17/276
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for preparing a rare earth nitrate solution in which rare earth hydroxides containing quadrivalent cerium are dissolved in nitric acid with the addition of hydrogen peroxide. The change in oxidation-reduction E.M.F. may be used to control the addition of peroxide to prevent formation of quadrivalent cerium ions in the nitrate solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.