4.5 Article

Study on recycling technology for waste MQ bonded Nd-Fe-B magnets

期刊

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 475, 期 -, 页码 465-469

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2018.12.005

关键词

Simple method; Recycled MQ Nd-Fe-B magnetic powder; Waste MQ Nd-Fe-B bonded magnets

资金

  1. Beijing Municipal Natural Science Foundation, China [2172012]
  2. International S&T Cooperation Program of China, China [2015DFG52020]
  3. National High Technology Research and Development Program of China, China [2012AA063201]

向作者/读者索取更多资源

A simple method is introduced to obtain recycled Nd-Fe-B powders from waste bonded Nd-Fe-B bulk magnets. The main difficulty of the recovery of waste MQ bonded Nd-Fe-B magnets is how to remove the epoxy resins between the magnetic particles and the oxide impurities on the surfaces of the waste magnetic powders. Mixed solvents of acetone, Dimethyl Formamide and N-butyl alcohol were used to dissolve the epoxy resins. Oxide impurities were removed using 0.5% acetic acid/acetone solutions. After these treatments, the carbon and oxygen contents were reduced from 21,200 ppm to 9700 ppm, and from 11,007 ppm to 8177 ppm, respectively. Under optimum processing conditions, the recycled magnetic powders possess improved magnetic properties with M-s of 151.5 emu/g, M-r of 98.0 emu/g, H-cj of 7.1 kOe, and (BH)(max) of 13.7 MGOe. These values, compared to the waste magnetic powders, represent increases of 21.2%, 18%, 0 and 34.3%, respectively.

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