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US 2019/0169710 A1Published application
Method For Extracting Rare Earth Elements Contained In Permanent Magnets
AssigneeBrgm
InventorsAlain Seron, Nour-Eddine Menad, Dominique Breeze, Marc Gamet
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Abstract
The invention relates to a method for extracting rare earth elements contained in permanent magnets, which includes the steps of thermal treatment of the permanent magnet, crushing at the end of the thermal treatment in order to obtain particles with a size smaller than 2 mm, treatment by agitation of the particles in a solution containing an organic acid, and separation of the liquid phase from the solid phase
Claims20
A process for extracting rare-earth elements contained in a permanent magnet of NdFeB type comprising the steps of:
- a) heat treating the permanent magnet at a temperature greater than or equal to its Curie temperature,
- b) grinding of the magnet resulting from the heat treatment step, the particles resulting from the grinding being classified in order to select the particles having, for 80% to 90% thereof, a size of less than 2 mm,
- c) treating, with stirring, the particles selected at the end of the grinding step with a solution containing an organic acid,
- d) separating a liquid phase from an optional solid phase at the end of the treatment with the solution containing the acid,
- e) separating the iron.
2 more elements
Dependencies are inferred from the claim text.