EP 4337803 A1 20240320 - METHOD FOR RECYCLING MAGNETS OF NDFEB TYPE, ANISOTROPIC POWDER RESULTING FROM THE RECYCLING, AND METHOD FOR PRODUCING A PERMANENT MAGNET FROM SAID POWDER
Title (en)
METHOD FOR RECYCLING MAGNETS OF NDFEB TYPE, ANISOTROPIC POWDER RESULTING FROM THE RECYCLING, AND METHOD FOR PRODUCING A PERMANENT MAGNET FROM SAID POWDER
Title (de)
VERFAHREN ZUM RECYCELN VON NDFEB-MAGNETEN, AUS DEM RECYCELN RESULTIERENDES ANISOTROPES PULVER UND VERFAHREN ZUR HERSTELLUNG EINES PERMANENTMAGNETEN AUS DEM PULVER
Title (fr)
PROCEDE DE RECYCLAGE D'AIMANTS DE TYPE NDFEB, POUDRE ANISOTROPE ISSUE DU RECYCLAGE ET PROCEDE D'ELABORATION D'UN AIMANT PERMANENT A PARTIR DE LADITE POUDRE
Publication
Application
Priority
- FR 2104940 A 20210510
- FR 2022050873 W 20220506
Abstract (en)
[origin: WO2022238642A1] The invention relates to a method for recycling NdFeB magnets, comprising the following steps: a) recovering waste containing solid NdFeB magnets to be recycled; b) preheating the waste to a preheat temperature of between 300°C and 500°C under an inert atmosphere, in a first chamber raised to the preheat temperature in a first station equipped with heating means; c) decrepitating using hydrogen, this operation being applied to the hot waste from step b), in a second chamber positioned in a second station distinct from the first station and equipped with a source of hydrogen and with pumping means, the decrepitation being performed at a temperature of between 200°C and 500°C, said temperature in the second chamber being maintained in this temperature range as a result of the exothermal nature of the reaction of hydriding the NdFeB magnets, the step c) leading to the formation of a first powder with particles containing a main phase consisting of Nd2Fe14B and/or an inter-granule a secondary phase, and having a particle size less than or equal to 5 mm.
IPC 8 full level
C22B 59/00 (2006.01); B22F 10/20 (2021.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01); C22B 7/00 (2006.01); C22C 1/04 (2023.01); H01F 1/053 (2006.01); H01F 1/057 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP)
B22F 1/052 (2022.01); B22F 9/023 (2013.01); B22F 10/25 (2021.01); B22F 10/28 (2021.01); B33Y 80/00 (2014.12); C22B 7/002 (2013.01); C22B 59/00 (2013.01); C22C 33/0278 (2013.01); C22C 38/005 (2013.01); H01F 41/0253 (2013.01); H01F 41/0273 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01); C22C 2202/02 (2013.01); H01F 1/0573 (2013.01)
C-Set (source: EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
FR 3122665 A1 20221111; FR 3122665 B1 20240105; EP 4337803 A1 20240320; JP 2024520299 A 20240524; WO 2022238642 A1 20221117
DOCDB simple family (application)
FR 2104940 A 20210510; EP 22724828 A 20220506; FR 2022050873 W 20220506; JP 2023569792 A 20220506