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

Sasaki, Yoshiyuki; Morita, Kenichi; Matsumiya, Masahiko; Ono, Ryoma; Shiroishi, Hidenobu

doi:10.1007/s11837-021-04586-1

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…The tridentate coordination of DGA and the coordination number 9 of Ln ions indicate that a complexation of three-folding Ln with DGA may be present. This result corresponds with that of a previous study [27], although this study shows the results of actinides with no stability constants. The β values for heavy Ln are higher than those for light Ln, which is based on their charge densities.…”

Section: Using the Results Insupporting

confidence: 92%

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Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system

Nomizu

Sasaki

Kaneko

et al. 2022

J Radioanal Nucl Chem

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We studied the stepwise formation constants (β) of water-soluble diglycolamide (DGA) and dioxaoctanediamide (DOODA) for the mutual separation of Ln in a solvent extraction system. TODGA (N,N,N',N'-tetraoctyl-diglycolamide) and DOODA(C8) (N,N,N',N'tetraoctyl-dioxaoctanediamide) exhibit opposite behaviors in extracting both light and heavy Ln through Ln-patterns. Metal complexes of two-and three-folding with watersoluble DOODA and DGA, respectively, were found, and each β value was calculated using distribution ratios. Taking β, their distribution ratio, D, and separation factor, SF, values into consideration, the suitable separation conditions (aqueous phase: 30 mM DOODA(C2) in 1 M HNO3; organic phase: 0.1 M TODGA in n-dodecane

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Section: Using the Results Insupporting

confidence: 92%

“…Recently, this method was widely reported by our group [26,27]. Although the batchwise multistage extraction method lacks the flow of aqueous and organic phases, it is advantageous since the experiment can be performed by one person with a small amount of sample solution and without the need of a special device such as a mixer settler.…”

Section: Introductionmentioning

confidence: 99%

Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system

Nomizu

Sasaki

Kaneko

et al. 2022

J Radioanal Nucl Chem

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“…This condition is following to the reference literature. 28 The Ln 3+ concentrations in all aqueous and organic phases after the multistage extractions were measured.…”

Section: Breakthrough Curvesmentioning

confidence: 99%

Separation of Light and Middle Lanthanides Using Multistage Extraction with Diglycolamide Extractant

2021

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We investigated the chemical behavior of lanthanides (Ln) by multistage extraction. Using 10 aqueous phases with Ln and 3 organic phases, we drew the breakthrough curves for light and middle Ln. Our study reveals that the limit of metal extraction depends on their D values and the metal concentration employed in experiments. From the multistage extractions of 15 stage aqueous phases and 15 stage organic phases, three curves (extraction curves, back-extraction curves, and separation curves) were obtained. Setting appropriate conditions, adequate separation of light Ln from middle ones can be achieved. As an example, under the condition of the separation curve experiment (aqueous phase: 0.5 M HNO3, organic phase: 0.1 M TDDGA (N,N,N′,N′-tetradecyl-diglycolamide) in n-dodecane), the recovery of more than 99% of Sm in the organic phase with less than 1% of Nd can be obtained, even in the case of two metals adjacent to each other in the Ln series.

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Application of diglycolamide extractant in rare-earth extraction

Wang,

Gong,

Qiu

et al. 2024

Aust. J. Chem.

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Diglycolamide (DGA) extractant is a kind of rare-earth extractant with promising applications that has the advantages of high extraction capacity, ease of synthesis, good thermal stability and good radiation stability. It is a green extractant that contains only four elements, C, H, O and N, and produces no residue after incineration. The properties of DGAs containing branched N,N′-alkyl substituents have been much studied in recent years, and it has been shown that branched side chains lead to better separation. The introduction of structurally rigid elements in DGA provides new possibilities for separation of rare earth elements (REEs). Owing to the tiny differences in the chemical properties of adjacent REES, the simple use of DGA extractant cannot meet all separation requirements, and a masking agent is added to the aqueous phase to improve the separation by coextraction to meet the requirements of different processes. This review presents the structural analysis of the complexes and crystals of diglycolamide extractants with rare-earth ions through different characterization means, and the effects of different structural extractants, solvents, nitric acid and phase modifiers on extraction behavior are reviewed. This review pays special attention to the effect of the side chain structure of diglycolamide on extraction behavior, which provides a theoretical basis and guiding direction for the field of separation of the REEs by diglycolamide extractants.

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

Cited by 3 publications

References 24 publications

Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system

Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system

Separation of Light and Middle Lanthanides Using Multistage Extraction with Diglycolamide Extractant

Application of diglycolamide extractant in rare-earth extraction

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