Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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.
Toigawa, Tomohiro; Tsubata, Yasuhiro; Kai, Takeshi; Furuta, Takuya; Kumagai, Yuta; Matsumura, Tatsuro
no journal, ,
Understanding of radiation effects is required for the developing radioactive nuclides separation for fuel cycle strategy. We proposed a dose evaluation method for the separation process. The radiation energy transfer to the extraction solvent was calculated by focusing on the emulsion structure that appears in the solvent extraction and the geometric structure of the extractor. The calculation results indicated the importance of considering the structures seen in solvent extraction to evaluate the radiation tolerance of the separation process.
Kaneko, Masashi
no journal, ,
Aiming to develop partitioning and transmutation of high-level radioactive waste, solvent extraction separation of minor actinides (MAs = Am, Cm) and rare-earths (REs) has been performed. In solution, Am and Cm are tri-positive ions, such as REs, and are known to have different selectivity between MAs and REs depending on donor atoms in extractant. This study aimed to theoretically elucidate difference in Am/Eu selectivity with dithiophosphinic acid and phosphinic acid by analyzing complex formation reaction and coordination bond based on density functional theory calculations. Am and Eu complexes were modeled by referring to single-crystal structures and reaction mechanisms reported previously. Gibbs energy analysis in the complex formation reaction indicated that dithiophosphinic acid forms more stable complex with Am than Eu, whereas phosphinic acid forms more stable complex with Eu than Am, being consistent with experimental Am/Eu selectivity. Bond overlap analysis between metal ion and donor atoms in the complexes suggested that interaction between Am f-orbital and donor atoms is one of origin to determine Am/Eu selectivity.