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Author:

Xu, Haibo (Xu, Haibo.) | Lu, Qingmei (Lu, Qingmei.) | Yu, Lichao (Yu, Lichao.) | Cong, Liying (Cong, Liying.) | Tian, Haowen (Tian, Haowen.) | Liu, Weiqiang (Liu, Weiqiang.) | Liu, Youhao (Liu, Youhao.) | Wang, Yunqiao (Wang, Yunqiao.) | Chen, Jingwu (Chen, Jingwu.) | Yi, Xiaofei (Yi, Xiaofei.) | Wu, Qiong (Wu, Qiong.) | Yue, Ming (Yue, Ming.)

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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:

Recycling Chlorine compounds Deionized water Rare earths Sintering Powders Washing Magnetic properties Methanol Iron alloys Dissolution Neodymium alloys

Author Community:

  • [ 1 ] [Xu, Haibo]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
  • [ 2 ] [Xu, Haibo]Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou; 341119, China
  • [ 3 ] [Lu, Qingmei]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
  • [ 4 ] [Yu, Lichao]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
  • [ 5 ] [Cong, Liying]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
  • [ 6 ] [Tian, Haowen]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
  • [ 7 ] [Liu, Weiqiang]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
  • [ 8 ] [Liu, Weiqiang]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei; 231500, China
  • [ 9 ] [Liu, Youhao]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei; 231500, China
  • [ 10 ] [Liu, Youhao]Earth-Panda Advanced Magnetic Materials Co., Ltd., Hefei; 231500, China
  • [ 11 ] [Wang, Yunqiao]Beijing Zhong Ke San Huan Research, Beijing; 102200, China
  • [ 12 ] [Chen, Jingwu]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei; 231500, China
  • [ 13 ] [Chen, Jingwu]Earth-Panda Advanced Magnetic Materials Co., Ltd., Hefei; 231500, China
  • [ 14 ] [Yi, Xiaofei]State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei; 231500, China
  • [ 15 ] [Yi, Xiaofei]Earth-Panda Advanced Magnetic Materials Co., Ltd., Hefei; 231500, China
  • [ 16 ] [Wu, Qiong]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
  • [ 17 ] [Yue, Ming]College of Materials Science & Engineering, Key Lab of Advanced Functional Materials, Beijing University of Technology, Beijing; 100124, China
  • [ 18 ] [Yue, Ming]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

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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