System and method for the recycling of rare earth magnets

Patent metadata

Field	Value
Publication number	US-11250980-B2
Application number	US-202016830932-A
Country	US
Kind code	B2
Filing date	Mar 26, 2020
Priority date	Nov 6, 2015
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A system and a method for separating and recycling magnets made from rare earth elements from an article of manufacture used an alignment device to property position the rare earth magnet for processing. Once proper alignment is made, a separating device removes the magnet and a portion of the article. A heating device demagnetizes the magnets and vibration causes the magnets to separate from the portion of the article. Electromagnets remove the portion of the article and the rare earth magnets pass through for reclamation.

First claim

The invention claimed is:

1. A method for recycling rare earth magnets from articles of manufacture comprising:
aligning the articles of manufacture into a predetermined orientation using a magnetic imaging system and one or more alignment devices to flip, position or rotate the articles of manufacture;
separating rare earth magnets from the articles of manufacture;
heating and demagnetizing the rare earth magnets that are separated from the articles of manufacture; and
separating the demagnetized rare earth magnets from residual portions of the articles of manufacture.

2. The method according to claim 1 wherein the aligning step includes using a vision system and one or more alignment devices to flip, position or rotate the articles of manufacture.

3. The method according to claim 1 wherein the aligning step includes using an X-Ray system and one or more alignment devices to flip, position or rotate the articles of manufacture.

4. The method according to claim 1 wherein separating rare earth magnets from the articles of manufacture is performed with a punch, a waterjet, or a laser.

5. The method according to claim 1 wherein the heating step includes using an induction heating coil.

6. The method according to claim 5 wherein the heating step further includes using an electromagnetic acoustical transducer for inducing vibration in the induction field of the induction coil.

7. A method for recycling rare earth materials from articles of manufacture including rare earth magnets, the method comprising:
aligning the articles of manufacture in a mixed product stream to pre-position the rare earth magnets for removal;
removing the rare earth magnets from the articles of manufacture in the mixed product stream by punching the rare earth magnets free of the articles of manufacture using a punch and a die;
heating the rare earth magnets to above the Currie temperature of the rare earth magnets to demagnetize the rare earth magnets; and
separating the demagnetized rare earth magnets from the remainder of the mixed product stream for formation into new magnetic stock.

8. The method according to claim 7 wherein aligning the articles of manufacture includes aligning the longitudinal axis of each of the articles of manufacture with its direction of travel.

9. The method according to claim 7 wherein aligning the articles of manufacture includes orienting the longitudinal axis of each of the articles of manufacture transverse to its direction of travel.

10. The method according to claim 7 wherein heating the rare earth magnets is performed using an induction heating coil and an electromagnetic acoustical transducer for inducing vibration in the induction field of the induction heating coil.

11. The method according to claim 7 wherein separating the demagnetized rare earth magnets from the remainder of the mixed product stream includes collecting, using an electromagnetic, residual components of the articles of manufacture in the remainder of the mixed product stream.

Assignees

• Ut Battelle Llc

Inventors

• Mcintyre Timothy J

Classifications

• B03C1/0335

  using coils · CPC title

• H01F13/006 Primary

  Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material (for erasing of information on magnetic record carriers G11B5/00) · CPC title

• H05B6/103

  multiple metal pieces successively being moved close to the inductor · CPC title

• B03C1/26

  with free falling material (B03C1/035 takes precedence) · CPC title

• Y02W30/50

  Reuse, recycling or recovery technologies · CPC title