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Author：

Xu, H. (Xu, H..) | Lu, Q. (Lu, Q..) | Yu, L. (Yu, L..) | Cong, L. (Cong, L..) | Tian, H. (Tian, H..) | Liu, W. (Liu, W..) | Liu, Y. (Liu, Y..) | Wang, Y. (Wang, Y..) | Chen, J. (Chen, J..) | Yi, X. (Yi, X..) | Wu, Q. (Wu, Q..) | Yue, M. (Yue, M..)

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EI Scopus

Abstract：

In　this　work,　the　recycled　Nd-Fe-B　powders　and　regenerated　Nd-Fe-B　sintered　magnets　with　low　impurity　content　were　successfully　prepared　from　Nd-Fe-B　magnet　sludge　via　reduction　diffusion　(RD)　method　followed　by　a　chemo-selective　dissolution　washing　process.　The　chemo-selective　dissolution　effect　of　various　solution　(deionized　water,　dilute　acetic　acid　solution,　NH4Cl-methanol　solution)　was　evaluated　by　impurity　content　and　magnetic　properties　of　the　recycled　Nd-Fe-B　powder.　The　NH4Cl-methanol　solution　can　selectively　remove　impurities　with　minimal　damage　to　the　magnetic　phase.　Besides,　the　optimal　NH4Cl　concentration　and　liquid-to-solid　ratio　were　investigated.　As　a　consequence,　the　contents　of　Ca,　O,　and　H　after　optimal　washing　process　are　reduced　to　0.07　wt%,　0.31　wt%　and　0.22　wt%,　respectively.　Hence,　M3　T　is　increased　to　146.72　emu/g,　which　is　33%　higher　than　that　of　the　initial　sludge.　Then,　the　regenerated　Nd-Fe-B　sintered　magnets　with　properties　of　Br　=　11.66　kG,　Hcj　=　16.49　kOe,　and　(BH)m　=　31.78　MGOe　were　successfully　prepared　by　mixing　with　40　wt%　Nd4Fe14B　alloy　powders.　Compared　with　the　corresponding　regenerated　magnets　washed　with　deionized　water,　the　remanence　and　coercivity　are　increased　by　18%　and　59%,　respectively.　©　2022　Chinese　Society　of　Rare　Earths

Keyword：

Rare earths Magnetic properties Recycling Nd-Fe-B magnet Sludge Reduction diffusion Chemo-selective dissolution Washing process

Author Community：

  • [ 1 ] [Xu H.]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing, 100124, China
  • [ 2 ] [Xu H.]Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341119, China
  • [ 3 ] [Lu Q.]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing, 100124, China
  • [ 4 ] [Yu L.]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing, 100124, China
  • [ 5 ] [Cong L.]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing, 100124, China
  • [ 6 ] [Tian H.]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing, 100124, China
  • [ 7 ] [Liu W.]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing, 100124, China
  • [ 8 ] [Liu W.]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei, 231500, China
  • [ 9 ] [Liu Y.]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei, 231500, China
  • [ 10 ] [Liu Y.]Earth-Panda Advanced Magnetic Materials Co., Ltd., Hefei, 231500, China
  • [ 11 ] [Wang Y.]Beijing Zhong Ke San Huan Research, Beijing, 102200, China
  • [ 12 ] [Chen J.]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei, 231500, China
  • [ 13 ] [Chen J.]Earth-Panda Advanced Magnetic Materials Co., Ltd., Hefei, 231500, China
  • [ 14 ] [Yi X.]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei, 231500, China
  • [ 15 ] [Yi X.]Earth-Panda Advanced Magnetic Materials Co., Ltd., Hefei, 231500, China
  • [ 16 ] [Wu Q.]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing, 100124, China
  • [ 17 ] [Yue M.]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing, 100124, China
  • [ 18 ] [Yue M.]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei, 231500, China

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Source ：

Journal of Rare Earths

ISSN： 1002-0721

Year： 2023

Issue： 12

Volume： 41

Page： 1976-1983

4 . 9 0 0

JCR@2022

ESI Discipline： CHEMISTRY;

ESI HC Threshold：20

Cited Count：

WoS CC Cited Count： 0

SCOPUS Cited Count： 5

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 10

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