Alkaline solution method for recovering rare earth elements
US11118245B2 · kind B2 · utility
1Cited by
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52Claims
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Key dates
| Filing date | Dec 15, 2017 |
| Grant date | Sep 14, 2021 |
| Priority date | — |
| Expiry date | Oct 8, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Novel methods of recovering neodymium and related rare earth elements from permanent magnets of various compositions are described. The methods employ processing steps including converting the magnet material to a higher surface area form such as a powder, treating the mixture with alkaline solutions to form product concentrated in neodymium and rare earth metals. Inexpensive materials such as ammonia, ammonium carbonate, carbon dioxide, water are recycled in a process that uses moderate temperatures, pressures and non-corrosive and environmentally-friendly chemicals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.