Title:
MAGNET RECYCLING TO CREATE ND-FE-B MAGNETS WITH IMPROVED OR RESTORED MAGNETIC PERFORMANCE
Document Type and Number:
Japanese Patent JP2022062051
Kind Code:
A
Abstract:
To provide production methods of recycled Nd-Fe-B sintered magnets using magnetic material from a waste magnet assembly.SOLUTION: The production methods include the steps of: demagnetizing magnetic material from a waste magnet assembly by cyclic heating and cooling of the magnetic material, fragmenting adhesives attached to the magnetic material, cracking coating layers of the magnetic material, and subjecting the magnetic material to at least one of a mechanical treatment and a chemical treatment, so as to remove the coating layers and prepare the magnetic material without impurities; fragmenting the demagnetized magnetic material to form a powder; and mixing the powder with a rare earth material R and an elemental additive A to produce a homogeneous powder, where the rare earth material R includes at least one of Nd and Pr, and the elemental additive A includes at least one of Nd, Pr, Dy, Co, Cu and Fe.SELECTED DRAWING: Figure 5
Inventors:
MIHA ZAKOTNIK
PETER AFIUNY
SCOTT DUNN
CATALINA OANA TUDOR
PETER AFIUNY
SCOTT DUNN
CATALINA OANA TUDOR
Application Number:
JP2022003692A
Publication Date:
April 19, 2022
Filing Date:
January 13, 2022
Export Citation:
Assignee:
URBAN MINING TECH COMPANY LLC
International Classes:
H01F41/02; B22F1/00; B22F1/14; B22F3/00; B22F3/24; B22F9/04; C22C28/00; C22C38/00; H01F1/057; H01F13/00
Domestic Patent References:
| JP2005057191A | 2005-03-03 | |||
| JP2000030919A | 2000-01-28 | |||
| JP2008163466A | 2008-07-17 | |||
| JP2013110387A | 2013-06-06 |
Foreign References:
| WO2009122709A1 | 2009-10-08 |
Attorney, Agent or Firm:
Toru Ishikawa
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