logo

For the Inventor, By the Inventor

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 9728310 B1

PDFFull Text
Date of Patent:
Aug. 08, 2017

Filed:

Apr. 19, 2016

Short-process method for preparing sintered ndfeb magnets with high magnetic properties recycling from ndfeb sludge

Applicants:

Beijing University of Technology, Beijing, CN;

Anhui Earth-panda Advance Magnetic Material Co., Ltd., Lujiang County, CN;

Inventors:

Ming Yue, Beijing, CN;

Weiqiang Liu, Beijing, CN;

Xiantao Li, Beijing, CN;

Meng Li, Beijing, CN;

Min Liu, Beijing, CN;

Dongtao Zhang, Beijing, CN;

Xiaowen Yin, Beijing, CN;

Xiulian Huang, Lujiang County, CN;

Jingwu Chen, Lujiang County, CN;

Xiaofei Yi, Lujiang County, CN;

Assignees:

BEIJING UNIVERSITY OF TECHNOLOGY, Beijing, CN;

ANHUI EARTH-PANDA ADVANCE MAGNETIC MATERIAL CO., LTD., Anhui Province, CN;

Attorney:

J.C. Patents

Primary Examiner:

Jonathan Johnson

Assistant Examiner:

Christopher Kessler

Int. Cl.
CPC ...
H01F 1/053 (2006.01); C22C 38/60 (2006.01); C22C 38/16 (2006.01); C22C 38/14 (2006.01); C22C 38/12 (2006.01); C22C 38/10 (2006.01); C22C 38/06 (2006.01); C22C 38/00 (2006.01); C22C 33/02 (2006.01); B22F 1/00 (2006.01); B22F 3/087 (2006.01); B22F 3/10 (2006.01); B22F 3/16 (2006.01); B22F 5/00 (2006.01); B22F 9/04 (2006.01); B22F 9/30 (2006.01); C21B 15/00 (2006.01); H01F 41/02 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0536 (2013.01); B22F 1/0003 (2013.01); B22F 3/087 (2013.01); B22F 3/10 (2013.01); B22F 3/16 (2013.01); B22F 5/00 (2013.01); B22F 9/04 (2013.01); B22F 9/30 (2013.01); C21B 15/00 (2013.01); C22C 33/0235 (2013.01); C22C 33/0264 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/06 (2013.01); C22C 38/10 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/60 (2013.01); H01F 41/0266 (2013.01); B22F 2301/355 (2013.01); B22F 2303/01 (2013.01); B22F 2303/15 (2013.01); B22F 2303/45 (2013.01); B22F 2304/10 (2013.01); B22F 2998/10 (2013.01);
Abstract

The present invention discloses a short process preparation technology of sintered NdFeB magnets from the NdFeB sludge, which relates to a field of recycle technology of NdFeB sludge. The present invention comprises the following steps: water bath distillation of organics in sludge, ultrasonic cleaning, calcium reduction and diffusion, ultrasonic rinsing in a magnetic field and drying, powders mixing and sintering. NdFeB sludge as raw materials was directly prepared from recycled sintered magnets with high magnetic properties. Most of the organics in the sludge could be removed by a vacuum distillation process with stepwise heating. The ultrasonic rinsing process in a magnetic field could effectively remove the remaining organics. The recycled sintered magnets exhibited good maximum energy product [(BH)] of 35.26 MGOe. The present invention has important features, such as the short processing time, efficient environmental protection, high recycling rate and effective utilization rate of rare earth metals.

Find Patent Forward Citations

Loading…