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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9044834 B1

PDFFull Text
Date of Patent:
Jun. 02, 2015

Filed:

Jun. 17, 2014

Magnet recycling to create nd—fe—b magnets with improved or restored magnetic performance

Applicants:

Miha Zakotnik, Newark, DE;

Peter Afiuny, Perryville, MD (US);

Scott Dunn, Perryville, MD (US);

Catalina Oana Tudor, Newark, DE (US);

Inventors:

Miha Zakotnik, Newark, DE;

Peter Afiuny, Perryville, MD (US);

Scott Dunn, Perryville, MD (US);

Catalina Oana Tudor, Newark, DE (US);

Assignee:

Urban Mining Technology Company, Perryville, MD (US);

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Jie Yang

Assistant Examiner:

Xiaowei Su

Int. Cl.
CPC ...
H01F 1/053 (2006.01); H01F 1/057 (2006.01); B23P 19/04 (2006.01); H01F 1/08 (2006.01); H01F 41/02 (2006.01); H01F 41/00 (2006.01); B01J 10/00 (2006.01); B22F 1/00 (2006.01); B22F 9/04 (2006.01);
U.S. Cl.
CPC ...
B23P 19/04 (2013.01); H01F 1/0577 (2013.01); H01F 1/086 (2013.01); H01F 41/0266 (2013.01); H01F 1/0573 (2013.01); H01F 41/0253 (2013.01); H01F 41/00 (2013.01); B01J 10/005 (2013.01); B22F 1/0088 (2013.01); B22F 9/04 (2013.01); H01F 1/057 (2013.01);
Abstract

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for recycling magnetic material to restore or improve the magnetic performance. One of the methods includes 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) a mechanical treatment or b) a chemical treatment, 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, wherein the rare earth material R comprises at least one of: Nd or Pr, and the elemental additive A comprises at least one of: Nd, Pr, Dy, Co, Cu, and Fe.

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