Method and system for recovering magnetic grains from sintered magnets or plastic magnets
AssigneesCentre National De La Recherche Scientifique, Universite De Rouen Normandie, Institut National Des Sciences Appliquees De Rouen Normandie
InventorsJean-Marie Le Breton, Nicolas Maat, Cyril Aymonier
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Abstract
Disclosed is a method and a device for retrieving, from an object A, elements G present in a matrix M, the method including at least the following steps: bringing said abject A into contact with a dense fluid Fd with a molar mass greater than 2 g mol−1 under temperature T1 and pressure P1 conditions suitable for transforming the intergranular phase and for releasing the elements G, modifying the temperature T2 and/or pressure P2 values to stop the reaction transforming the intergranular phase, and recovering the elements G separated front the matrix M.
Claims16
Method for recovering magnetic grains from an object A, the object A comprising said magnetic grains and an intergranular phase between the magnetic grains, wherein the object A is a sintered magnet, said method comprising at least the following steps:
- Contacting the object A with a dense fluid Fd of molar mass greater than 2 g mol−1 under conditions of temperature T1 and pressure P1 that are intended to transform the intergranular phase and to release the magnetic grains, (302), wherein the temperature and pressure conditions are less than the temperatures inducing the melting of the object A or any of the magnetic grains to be released, in order to perform a transformation of the intergranular phase,
- Modifying the temperature up to a T2 temperature value and/or the pressure up to a P2 pressure value to stop the transformation of the intergranular phase, (303),
- Retrieving the magnetic grains separated from the intergranular phase, said magnetic grains retaining their magnetic properties sufficient to be used for the production of new magnetic materials (304).
Dependencies are inferred from the claim text.