Open Access
Separation of rare earths and other valuable metals from deep-eutectic solvents: a new alternative for the recycling of used NdFeB magnets
S. Riano
1
,
Martina Petranikova
2
,
Bieke Onghena
1
,
Tom Vander Hoogerstraete
1
,
MM Foreman
2
,
C Ekberg
2
,
Koen Binnemans
1
Publication type: Journal Article
Publication date: 2017-06-23
scimago Q1
wos Q2
SJR: 0.777
CiteScore: 7.6
Impact factor: 4.6
ISSN: 20462069
General Chemistry
General Chemical Engineering
Abstract
Deep-eutectic solvents (DESs) are used as a promising alternative to aqueous solutions for the recovery of valuable metals from NdFeB magnets. A deep-eutectic solvent based on choline chloride and lactic acid (molar ratio 1 : 2) was used for the leaching of rare earths and other metals from NdFeB magnets. A process for the separation of Fe, B and Co from Nd and Dy in the deep-eutectic solvent was developed by using the ionic liquid tricaprylmethylammonium thiocyanate (Aliquat 336 SCN, [A336][SCN]) diluted in toluene (0.9 M). The extraction parameters were optimized and stripping of B was efficiently carried out by HCl, while EDTA was employed for the recovery of Fe and Co. The separation of Nd and Dy was assessed by using two different types of extractants, a mixture of trialkylphosphine oxides (Cyanex 923) and bis(2-ethylhexyl)phosphoric acid (D2EHPA). Based on the distribution ratios, separation factors and the ease of subsequent stripping, Cyanex 923 was chosen as the most effective extractant. The purified Dy present in the less polar phase was easily recovered by stripping with water, while the Nd present in the deep-eutectic solvent was recovered by precipitation stripping with a stoichiometric amount of oxalic acid. Nd2O3 and Dy2O3 were recovered with a purity of 99.87% and 99.94%, respectively. The feasibility to scale up this separation process was corroborated by a setup of mixer-settlers and highlighted by the possibility to fully recover and reuse the deep-eutectic solvent and the less polar phases employed in the extractions. The new proposed system based on a deep-eutectic solvent combined with traditional organic extraction phases presented higher selectivities and efficiencies than the analogous aqueous system. Extended X-ray absorption fine structure (EXAFS) was employed to elucidate the different mechanisms for extraction of Co and Fe from the deep-eutectic solvent and from an aqueous solution.
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157
Total citations:
157
Citations from 2025:
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(21.65%)
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Riano S. et al. Separation of rare earths and other valuable metals from deep-eutectic solvents: a new alternative for the recycling of used NdFeB magnets // RSC Advances. 2017. Vol. 7. No. 51. pp. 32100-32113.
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Riano S., Petranikova M., Onghena B., Vander Hoogerstraete T., Banerjee D., Foreman M., Ekberg C., Binnemans K. Separation of rare earths and other valuable metals from deep-eutectic solvents: a new alternative for the recycling of used NdFeB magnets // RSC Advances. 2017. Vol. 7. No. 51. pp. 32100-32113.
Cite this
RIS
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TY - JOUR
DO - 10.1039/C7RA06540J
UR - https://doi.org/10.1039/C7RA06540J
TI - Separation of rare earths and other valuable metals from deep-eutectic solvents: a new alternative for the recycling of used NdFeB magnets
T2 - RSC Advances
AU - Riano, S.
AU - Petranikova, Martina
AU - Onghena, Bieke
AU - Vander Hoogerstraete, Tom
AU - Banerjee, Dipanjan
AU - Foreman, MM
AU - Ekberg, C
AU - Binnemans, Koen
PY - 2017
DA - 2017/06/23
PB - Royal Society of Chemistry (RSC)
SP - 32100-32113
IS - 51
VL - 7
SN - 2046-2069
ER -
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@article{2017_Riano,
author = {S. Riano and Martina Petranikova and Bieke Onghena and Tom Vander Hoogerstraete and Dipanjan Banerjee and MM Foreman and C Ekberg and Koen Binnemans},
title = {Separation of rare earths and other valuable metals from deep-eutectic solvents: a new alternative for the recycling of used NdFeB magnets},
journal = {RSC Advances},
year = {2017},
volume = {7},
publisher = {Royal Society of Chemistry (RSC)},
month = {jun},
url = {https://doi.org/10.1039/C7RA06540J},
number = {51},
pages = {32100--32113},
doi = {10.1039/C7RA06540J}
}
Cite this
MLA
Copy
Riano, S., et al. “Separation of rare earths and other valuable metals from deep-eutectic solvents: a new alternative for the recycling of used NdFeB magnets.” RSC Advances, vol. 7, no. 51, Jun. 2017, pp. 32100-32113. https://doi.org/10.1039/C7RA06540J.
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