Method for chromatographically recovering scandium and yttrium
US5045209A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1990 |
| Grant date | Sep 3, 1991 |
| Priority date | — |
| Expiry date | Sep 24, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Scandium and yttrium present in sand is recovered from the residue pulled from sand chlorinators. The residue is digested with an acid to produce a liquid containing scandium, yttrium, sodium, calcium and at least one radioactive metal of the group consisting of radium, thorium and uranium. The metal-containing liquid is then fed through a cation exchanger. The cation exchanger is eluted with an acid to produce eluate functions containing at least partially separated metals. A first eluate fraction contains at least half of the calcium and the sodium, a second eluate fraction contains at least half of the radioactive metals, a third eluate fraction contains at least half of the scandium and a fourth eluate fraction contains at least half of the yttrium which were contained in the metal-containing feed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.