Method for recovering reusable elements from rare earth-iron alloy
US5961938A · kind A · utility
5Cited by
0References
8Claims
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Inventor
Key dates
| Filing date | Feb 11, 1997 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Feb 11, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for recovering rare earth elements and cobalt from a rare earth-iron alloy containing cobalt is disclosed, including the steps of: PA1 a preparing a slurry of the rare earth-iron alloy containing cobalt, PA1 adding a diluted nitric acid solution to the slurry with air being introduced into the slurry, while maintaining pH of a resulting mixture at 5 or higher to dissolve metals including rare earth metals and cobalt at 50.degree. C. or lower, and PA1 separating an undissolved residue containing iron from a rare earth-containing nitrate solution by filtration.
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