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Author:

Yin, Xiaowen (Yin, Xiaowen.) | Yue, Ming (Yue, Ming.) (Scholars:岳明) | Lu, Qingmei (Lu, Qingmei.) | Liu, Min (Liu, Min.) | Wang, Feng (Wang, Feng.) | Qiu, Yubing (Qiu, Yubing.) | Liu, Weiqiang (Liu, Weiqiang.) (Scholars:刘卫强) | Zuo, Tieyong (Zuo, Tieyong.) (Scholars:左铁镛) | Zha, Shanshun (Zha, Shanshun.) | Li, Xuliang (Li, Xuliang.) | Yi, Xiaofei (Yi, Xiaofei.)

Indexed by:

EI Scopus SCIE

Abstract:

Given the increasing concern regarding the global decline in rare earth reserves and the environmental burden from current wet-process recycling techniques, it is urgent to develop an efficient recycling technique for leftover sludge from the manufacturing process of neodymium-iron-boron (Nd-Fe-B) sintered magnets. In the present study, centerless grinding sludge from the Nd-Fe-B sintered magnet machining process was selected as the starting material. The sludge was subjected to a reduction-diffusion (RD) process in order to synthesize recycled neodymium magnet (Nd2Fe14B) powder; during this process, most of the valuable elements, including neodymium (Nd), praseodymium (Pr), gadolinium (Gd), dysprosium (Dy), holmium (Ho), and cobalt (Co), were recovered simultaneously. Calcium chloride (CaCl2) powder with a lower melting point was introduced into the RD process to reduce recycling cost and improve recycling efficiency. The mechanism of the reactions was investigated systematically by adjusting the reaction temperature and calcium/sludge weight ratio. It was found that single-phase Nd2Fe14B particles with good crystallinity were obtained when the calcium weight ratio (calcium/sludge) and reaction temperature were 40 wt% and 1050 degrees C, respectively. The recovered Nd2Fe14B particles were blended with 37.7 wt% Nd2Fe14B powder to fabricate Nd-Fe-B sintered magnets with a remanence of 12.1 kG (1 G = 1 x 10(-4) T), and a coercivity of 14.6 kOe (1 Oe = 79.6 A.m(-1)), resulting in an energy product of 34.5 MGOe. This recycling route promises a great advantage in recycling efficiency as well as in cost. (C) 2020 THE AUTHORS. Published by Elsevier LTD on behalf of Chinese Academy of Engineering and Higher Education Press Limited Company.

Keyword:

Nd-Fe-B grinding sludge Calcium reduction-diffusion Rare-earth-rich alloy doping Recycled sintered magnets

Author Community:

  • [ 1 ] [Yin, Xiaowen]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Yue, Ming]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Lu, Qingmei]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Liu, Min]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Wang, Feng]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 6 ] [Qiu, Yubing]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 7 ] [Liu, Weiqiang]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 8 ] [Zuo, Tieyong]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 9 ] [Yue, Ming]State Key Lab Rare Earth Permanent Magnet Mat, Hefei 231500, Peoples R China
  • [ 10 ] [Liu, Weiqiang]State Key Lab Rare Earth Permanent Magnet Mat, Hefei 231500, Peoples R China
  • [ 11 ] [Zha, Shanshun]State Key Lab Rare Earth Permanent Magnet Mat, Hefei 231500, Peoples R China
  • [ 12 ] [Li, Xuliang]State Key Lab Rare Earth Permanent Magnet Mat, Hefei 231500, Peoples R China
  • [ 13 ] [Yi, Xiaofei]State Key Lab Rare Earth Permanent Magnet Mat, Hefei 231500, Peoples R China
  • [ 14 ] [Yue, Ming]Beijing Univ Technol, Minist Educ, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China
  • [ 15 ] [Lu, Qingmei]Beijing Univ Technol, Minist Educ, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China
  • [ 16 ] [Liu, Min]Beijing Univ Technol, Minist Educ, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China
  • [ 17 ] [Liu, Weiqiang]Beijing Univ Technol, Minist Educ, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China
  • [ 18 ] [Zuo, Tieyong]Beijing Univ Technol, Minist Educ, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China
  • [ 19 ] [Zha, Shanshun]Earth Panda Adv Magnet Mat Co Ltd, Hefei 231500, Peoples R China
  • [ 20 ] [Li, Xuliang]Earth Panda Adv Magnet Mat Co Ltd, Hefei 231500, Peoples R China
  • [ 21 ] [Yi, Xiaofei]Earth Panda Adv Magnet Mat Co Ltd, Hefei 231500, Peoples R China

Reprint Author's Address:

  • 岳明

    [Yue, Ming]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China;;[Yue, Ming]State Key Lab Rare Earth Permanent Magnet Mat, Hefei 231500, Peoples R China;;[Yue, Ming]Beijing Univ Technol, Minist Educ, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China

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Source :

ENGINEERING

ISSN: 2095-8099

Year: 2020

Issue: 2

Volume: 6

Page: 165-172

1 2 . 8 0 0

JCR@2022

Cited Count:

WoS CC Cited Count: 22

SCOPUS Cited Count: 25

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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