Advanced search
1 file | 1.60 MB

Selective electrochemical extraction of REEs from NdFeB magnet waste at room temperature

(2018) GREEN CHEMISTRY. 20(5). p.1065-1073
Author
Organization
Abstract
NdFeB magnet waste is one of the important secondary resources from which rare-earth elements (REEs) can be recovered. Herein we present an electrochemical route to selectively extract REEs from the magnet waste at room temperature. First, the magnet waste was partially leached with HCl. The partial leachate along with undissolved magnet waste was taken in the anolyte side of a two compartment reactor separated by an anion exchange membrane whereas the catholyte consisted of sodium chloride solution. The Fe(II) present in the leachate was oxidized and precipitated as Fe(OH)(3) while more than 95% of REEs were extracted into the solution. Subsequently, oxalic acid was used to selectively precipitate REEs as rare-earth oxalates. Hydrochloric acid liberated during the oxalic acid precipitation process could be directly reused in the partial leaching step. Sodium chloride was the only chemical consumed during the electrolysis. The effect of the NaCl concentration in the anolyte and catholyte on the extraction of metals was investigated. From magnet waste to rare-earth oxides, the developed recycling process is environmentally friendly and consumes only electricity, NaCl and oxalic acid.
Keywords
RARE-EARTH-ELEMENTS, RECOVERY, ACID, METALS, KINETICS, COBALT, SCRAP, IRON, TECHNOLOGIES, ELECTROLYSIS

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 1.60 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Venkatesan, Prakash, Tom Vander Hoogerstraete, Tom Hennebel, Koen Binnemans, Jilt Sietsma, and Yongxiang Yang. 2018. “Selective Electrochemical Extraction of REEs from NdFeB Magnet Waste at Room Temperature.” Green Chemistry 20 (5): 1065–1073.
APA
Venkatesan, P., Vander Hoogerstraete, T., Hennebel, T., Binnemans, K., Sietsma, J., & Yang, Y. (2018). Selective electrochemical extraction of REEs from NdFeB magnet waste at room temperature. GREEN CHEMISTRY, 20(5), 1065–1073.
Vancouver
1.
Venkatesan P, Vander Hoogerstraete T, Hennebel T, Binnemans K, Sietsma J, Yang Y. Selective electrochemical extraction of REEs from NdFeB magnet waste at room temperature. GREEN CHEMISTRY. 2018;20(5):1065–73.
MLA
Venkatesan, Prakash et al. “Selective Electrochemical Extraction of REEs from NdFeB Magnet Waste at Room Temperature.” GREEN CHEMISTRY 20.5 (2018): 1065–1073. Print.
@article{8560379,
  abstract     = {NdFeB magnet waste is one of the important secondary resources from which rare-earth elements (REEs) can be recovered. Herein we present an electrochemical route to selectively extract REEs from the magnet waste at room temperature. First, the magnet waste was partially leached with HCl. The partial leachate along with undissolved magnet waste was taken in the anolyte side of a two compartment reactor separated by an anion exchange membrane whereas the catholyte consisted of sodium chloride solution. The Fe(II) present in the leachate was oxidized and precipitated as Fe(OH)(3) while more than 95\% of REEs were extracted into the solution. Subsequently, oxalic acid was used to selectively precipitate REEs as rare-earth oxalates. Hydrochloric acid liberated during the oxalic acid precipitation process could be directly reused in the partial leaching step. Sodium chloride was the only chemical consumed during the electrolysis. The effect of the NaCl concentration in the anolyte and catholyte on the extraction of metals was investigated. From magnet waste to rare-earth oxides, the developed recycling process is environmentally friendly and consumes only electricity, NaCl and oxalic acid.},
  author       = {Venkatesan, Prakash and Vander Hoogerstraete, Tom and Hennebel, Tom and Binnemans, Koen and Sietsma, Jilt and Yang, Yongxiang},
  issn         = {1463-9262},
  journal      = {GREEN CHEMISTRY},
  language     = {eng},
  number       = {5},
  pages        = {1065--1073},
  title        = {Selective electrochemical extraction of REEs from NdFeB magnet waste at room temperature},
  url          = {http://dx.doi.org/10.1039/c7gc03296j},
  volume       = {20},
  year         = {2018},
}

Altmetric
View in Altmetric
Web of Science
Times cited: