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Sasaki, Yuji; Matsumiya, Masahiko*; Tsuchida, Yusuke*
Analytical Sciences, 36(11), p.1303 - 1309, 2020/11
Times Cited Count：6 Percentile：33.87(Chemistry, Analytical)The mutual separation of lanthanides is studied by multi-stage extraction using extractant, DGA (diglycolamide) compounds. Tetraoctyl-DGA (TODGA) has a high extractability to lanthanides and relatively high separation factor (SF) between Dy and Nd (SF: over 20). The complete separation with such SF value can be achieved by multi-stage extraction. Less information on multi-stage extraction compared to batch extraction is presented up to now, thus we conduct the basic study about that. Confirming the experimental data to be identical to the calculation, the sample solution including both metals is employed for the batchwise multi-stage extraction. Ninety-seven % of Dy with under detection limit of Nd can be recovered into the organic phase from Nd with ten times higher concentration than Dy using the condition, 0.1 M TODGA/n-dodecane and 0.3 M HNO
by multi-stage extraction of 9
9 for organic and aqueous phases.
Sasaki, Yuji; Matsumiya, Masahiko*
no journal, ,
DGA (diglycolamide) compounds can extract lanthanide (Ln) elements in nitric acid and shows the high D(Ln). The separation factors (SF) between light and heavy Ln are relatively high, thus the mutual separation of Ln can be easily done by DGA compounds. On the other hand, their SF is not so high, the separation and recovery between Nd and Dy are performed using batchwise multi-step extraction. In this work, calculation results are compared with the experiments, and its effect is confirmed.
Sasaki, Yuji; Morita, Keisuke; Matsumiya, Masahiko*
no journal, ,
The separation and isolation of Dy from Nd magnet is important task for the rare-metal recycles. These lanthanide metal ions have normally low separation factors because of same oxidation state and similar ionic radii. Therefore, multi-step extractions are indispensable in order to increase mutual separation factors. We performed the batchwise multi-step extraction for the mutual separation of Nd and Dy using diglycolamide extractant. The analytical results will be shown in the poster presentation.
Sasaki, Yuji; Matsumiya, Masahiko*; Nakase, Masahiko*
no journal, ,
We will show the background how to prepare DGA compounds that we develop initially and the results of their extraction abilities. In addition, as an example of utility of DGA compounds for the mutual separation of lanthanides and actinides, the results of the batchwise multi-step extraction for Nd and Dy separation will be shown.
Sasaki, Yuji; Matsumiya, Masahiko*
no journal, ,
In our laboratory, the mutual separation of lanthanides by batch-wise multi-stage extraction is conducted. Dy is introduced into Nd-magnet, for this recycle mutual separation of Dy and Nd in important. Here, the solvent extraction method is used for their separation. We confirm the consistency between calculation and experimental results and perform the separation experiments of Dy from Nd. The results will be shown in the presentation.
Matsutani, Takafumi*; Sasaki, Yuji; Katsuta, Shoichi*
no journal, ,
The mutual separation of lanthanide is difficult because the chemical behavior of lanthanides is very analogous. Thus, the task to develop the mutual separation method among lanthanide is important. Here, we examined to separate lanthanides using batch-wise multi-stage extraction with TDDGA. The batch-wise multi-stage extraction can be evaluated based on the plate-theory of chromatography, thus we investigated the basic results of batch-wise multi-stage extractions.
Sasaki, Yuji; Kaneko, Masashi; Ban, Yasutoshi; Matsumiya, Masahiko*; Nakase, Masahiko*; Takeshita, Kenji*
no journal, ,
In our group, the separation of An from Ln is performed using batch-wise multi stage extraction. The condition, DGA(diglycolamide)-DTPA(diethylenetriamine-pentaacetic acid) or DGA-DTBA(diethylenetriamine-triacetic diamide),showed approximate 10 of D(Am)/D(Ln). The multi stage extraction of 10 10 of organic and aqueous phase numbers gives successfully 97% of Am with 3% of Ln in the aqueous phase.
Nomizu, Daiki; Sasaki, Yuji; Kaneko, Masashi; Matsumiya, Masahiko*; Katsuta, Shoichi*
no journal, ,
In our group, the mutual separation of lanthanides by solvent extraction method is conducted. We focus on two phases in solvent extraction, the hydrophilic and lipophilic reagents are employed in both phases. Namely, using the condition of TODGA in organic phase and DOODA(C2, dioxaoctane-diamide) in aqueous phase or DOODA(C8) in organic phase and TEDGA in aqueous phase, the distribution ratios of Ln are compared. Using these results, the batch-wise multi stage extractions are performed in order to separate light and heavy Ln.
