A route for recycling Nd from Nd-Fe-B magnets using Cu melts

Moore, Martina; Gebert, A.; Stoica, M.; Uhlemann, Margitta; Löser, W.

doi:10.1016/j.jallcom.2015.05.238

Cited by 29 publications

(7 citation statements)

References 30 publications

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“…1,2 Dy should thus be isolated from Nd and recycled. Hydrometallurgical methods for the recovery of Nd and Dy from scrapped products have been widely studied, 3 -7 using techniques such as solvent extraction, 3 complexation with amine and acid, 4 molten method, 5 electrolysis, 6 and adsorption. 7 However, there are few reports on separation methods that can achieve high recoveries of Dy but with low amounts of Nd to date.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Study on Multistage Extraction Using TDdDGA for Separation of Lanthanides Present in Nd Magnets

Sasaki

Morita

Matsumiya

et al. 2021

JOM

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The separation of Dy from Nd has been studied from the viewpoint of recycling Dy from Nd magnets. N,N,N′,N′-tetradodecyl-DGA (TDdDGA) has a relatively high separation factor between Dy and Nd (above 10) in HNO3 medium. After basic research on batchwise multistage extractions using eight extraction stages with 0.1 M TDdDGA in n-dodecane as organic phase, ten stages with an aqueous phase (0.7 M HNO3 with metals), and six stages with another aqueous phase (0.7 M HNO3 without metals), approximately 99% of Dy was recovered into the organic phase with 1% coextraction of Nd.

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Section: Introductionmentioning

confidence: 99%

Fundamental Study on Multistage Extraction Using TDdDGA for Separation of Lanthanides Present in Nd Magnets

Sasaki

Morita

Matsumiya

et al. 2021

JOM

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“…One of the recycling processes for recovering HREEs from EOL magnets or scraps, the pyrometallurgy method, is a potential alternative to collect REEs from Nd-Dy-Fe-B magnet [7][8][9]. Among these processes, liquid metal extraction (LME) is based on a selective reaction with target metals by using solvent metals, such as Mg, Ag, Bi, and Cu [10][11][12][13]. It has the advantage of being an environmentally friendly chemical-free process without the emission of wastes and no requirement of additional reduction processes due to the direct recovery of REEs in metal form.…”

Section: Introductionmentioning

confidence: 99%

“…The Mg is a strong candidate for being an extraction agent in the LME process. It can be selectively reacted with REEs (Nd, Dy) without Fe and B intermetallic compounds due to higher chemical affinity with REEs (Nd, Dy)) compared to with Fe [13]. Previous studies have shown that Nd is easily extracted from the Nd-Dy-Fe-B magnet and the reaction mechanism is successfully demonstrated [10,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium

Nam

Park

Rasheed

et al. 2021

Metals

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During the liquid metal extraction reaction between a Nd-Dy-Fe-B magnet and liquid Mg, Nd rapidly diffuses out of the magnet, whereas Dy is not extracted due to the reaction with the matrix and the formation of Dy2Fe17 phase. In addition, theDy2O3 phase exists at the grain boundaries. Until now, only the effect of the Dy2O3 phase on the extraction of Dy has been reported. In this study, the effect of the Dy2Fe17 phase on the extraction of Dy from the Nd-Dy-Fe-B magnet was investigated in liquid Mg. The formation of the Dy2Fe17 phase during the reaction between Mg and matrix (RE2Fe14B) was first examined using a thermodynamical approach and confirmed by microstructural analysis. It was observed that Dy extraction was dominated by Dy2Fe17 phase decomposition from 3 h to 24 h, followed by Dy2O3 phase dominant reaction with Mg. Comparing the activities of the Dy2Fe17 phase and the Dy2O3 phase, the reaction of Dy2Fe17 is dominant, as compared to the Dy2O3 phase. Finally, at 48 h, the high Dy extraction percentage of 93% was achieved. As a result, in was concluded that the Dy2Fe17 phase acts as an obstacle in the extraction of Dy. In the future, if research to control the Dy2Fe17 phase proceeds, it will be of great importance to advance the recycling of Dy.

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“…Hydrometallurgical methods to recover valuable Dy from scrapped products have been studied considerably. [1][2][3][4] Solvent extraction is one of the representative methods for use in industry. New extractants concerning lanthanides are developed in the atomic energy field, because of their high concentration in high level radioactive nitric acid waste.…”

Section: Introductionmentioning

confidence: 99%

Basic Research on Batchwise Multi-stage Extractions Using TODGA for Dy/Nd Separation

2020

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The mutual separation of lanthanides has been studied by multi-stage extraction using an extractant, DGA (diglycolamide) compounds. N,N,N′,N′-tetraoctyl-DGA (TODGA) has a high extractability to lanthanides and a relatively high separation factor (SF) between Dy and Nd (SF of over 20) from HNO3 media. Complete separation with such SF values can be achieved by multi-stage extraction. Less information on multi-stage extraction compared to batch extraction has been presented up to now. We thus conducted a basic study. By confirming the experimental data to be identical to calculations, the sample solution including both metals was employed for batchwise multi-stage extraction. Ninety-seven percent of Dy with under detection limit of Nd could be recovered into the organic phase from Nd with a ten-times higher concentration than Dy using the condition, 0.1 M TODGA/n-dodecane and 0.3 M HNO3 by the multi extraction of 9 × 9 stages for organic and aqueous phases.

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A route for recycling Nd from Nd-Fe-B magnets using Cu melts

Cited by 29 publications

References 30 publications

Fundamental Study on Multistage Extraction Using TDdDGA for Separation of Lanthanides Present in Nd Magnets

Fundamental Study on Multistage Extraction Using TDdDGA for Separation of Lanthanides Present in Nd Magnets

Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium

Basic Research on Batchwise Multi-stage Extractions Using TODGA for Dy/Nd Separation

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