Extracting rare-earth elements from a gangue heavy fraction
US10688501B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | Oct 31, 2017 |
| Grant date | Jun 23, 2020 |
| Priority date | — |
| Expiry date | Oct 31, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B59/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Described herein are technologies for concentrating rare-earth elements from a heavy fraction of grit in gangue produced in kaolin mining. In some examples, grit is separated as a non-clay fraction of gangue produced in a kaolin mining operation. The grit is separated into a heavy mineral grit sub-fraction and a light mineral grit sub-fraction. Rare-earth elements, particularly heavy rare-earth elements, are thereafter extracted from the heavy mineral grit sub-fraction using various extraction technologies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.