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Oral presentation

Study on electrochemical measurement method in molten alkaline molybdate

Nagai, Takayuki; Uehara, Akihiro*; Fukushima, Mineo; Myochin, Munetaka; Sato, Nobuaki*; Yamana, Hajimu*

no journal, , 

The study of a pyrochemical process by using a molten alkaline molybdate has been carried out as a candidate reprocessing process for spent nuclear oxide fuels. This alkaline molybdate has a useful characteristic, which is an ability to dissolve uranium oxides in a short time. To establish the electrochemical measurement technique in the molten alkaline molybdate, we carried out the cyclic voltammetry in molten lithium molybdate-sodium molybdate eutectic, which is used for the general measuring method of molten chlorides.

Oral presentation

Pyrochemical behavior of phosphate for spent electrolyte recycling

Kofuji, Hirohide; Sasaki, Kazuya*; Amamoto, Ippei; Sawada, Nobuyuki*; Yasumoto, Masaru*; Myochin, Munetaka; Terai, Takayuki*

no journal, , 

Adaptation of the phosphate conversion technique has been evaluated to recycle the spent electrolyte generated from metal electrorefining process which is a kind of pyrochemical reprocessing technologies. The accumulated impurities such as fission products are precipitated as phosphate by adding lithium phosphate and separated from the molten salt in the process. To discuss the conversion reaction, some thermodynamic properties are required however few data have been published relating to the phosphate, they were attempted to be derived from the results of thermal analysis. The pyrochemical behavior and estimation of heat capacity of lanthanum phosphate and lithium phosphate will be introduced in this report.

Oral presentation

Drawing phase diagrams of LiCl-KCl-AnCl$$_{3}$$ system by thermometric analyses

Nakayoshi, Akira; Kitawaki, Shinichi; Fukushima, Mineo; Murakami, Tsuyoshi*; Kurata, Masaki*

no journal, , 

no abstracts in English

Oral presentation

Structural study on Au(111) electrode surface in [BMP]TFSA using in-situ surface X-ray scattering

Tamura, Kazuhisa; Miyaguchi, Shinichiro*; Sakaue, Kiyoshi*; Nishihata, Yasuo

no journal, , 

Potential dependence of Au(111) electrode surface structure in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([BMP]TFSA) was investigated using in-situ surface X-ray scattering. In the electrochemical window of Au(111) electrode in [BMP]TFSA, three potential regions, that is, reconstruction region (E $$<$$ -1.5 V vs. Ag$$^{+}$$/Ag), (1 $$times$$ 1) region (-1.5 $$<$$ E $$<$$ 0.05 V), and (1 $$times$$ 1)-II region (0.05 $$<$$ E $$<$$ 0.9 V), were found. In reconstruction region, (1 $$times$$ 1) structure turns to reconstructed structure gradually and the reconstructed structure reversibly returns to (1 $$times$$ 1) structure in (1 $$times$$ 1) region. At the potential between (1 $$times$$ 1) and (1 $$times$$ 1)-II regions, dips were observed in diffracted intensity originated from (1 $$times$$ 1) structure. At this potential, a phase transition, which causes temporary disordering of Au(111) surface, may occur in double layer.

Oral presentation

Electrorefining test using UZr alloy in LiCl-KCl-(U,Pu,Am)Cl$$_{3}$$3 molten salt

Kurata, Masaki*; Murakami, Tsuyoshi*; Kitawaki, Shinichi; Nakayoshi, Akira; Fukushima, Mineo

no journal, , 

In the electrorefining step of pyro-reprocessing, uranium recovery using solid cathodes and actinides recovery using liquid Cd cathodes are sequentially cycled in the practical operation and simultaneously various elements including zirconium constituent of metal fuel are dissolved from the anodes. In the present study, sequential electrolysis tests were carried out using UZr alloy anodes in LiCl-KCl-(U,Pu,Am)Cl$$_{3}$$3 molten salt bath. Variation of operation parameters, such as electrode potential etc., and the zirconium behavior were investigated.

Oral presentation

On the local structural change in molten LaCl$$_3$$ mixtures by the difference of the solvent salt

Okamoto, Yoshihiro; Shiwaku, Hideaki; Ikeda, Atsushi; Suzuki, Shinichi; Akutsu, Kazuhiro; Kobayashi, Toru; Yaita, Tsuyoshi; Madden, P. A.*

no journal, , 

The solvent dependency of the local structure in molten LaCl$$_3$$ was examined by using the X-ray absorption fine structure (XAFS) and molecular dynamics (MD) techniques. An octahedral coordination structure (LaCl$$_6$$)$$^{3-}$$ is not formed and stabilized by the mixing with LiCl and MgCl$$_2$$, but with KCl. It suggests that a cation having smaller size and higher electric charge obstructs the stabilization of the coordination structure.

Oral presentation

Structural analysis of molten TbF$$_3$$-LiF

Numakura, Masahiko*; Bessada, C.*; Ory, S.*; Rakhamatullin, A.*; Akatsuka, Hiroshi*; Nezu, Atsushi*; Yaita, Tsuyoshi; Okamoto, Yoshihiro; Shiwaku, Hideaki; Matsuura, Haruaki*

no journal, , 

To investigate the local structure of molten TbF$$_3$$ - LiF (x[TbF$$_3$$ = 0.2), X-ray absorption fine structure technique (XAFS) was applied using by BL11XU in SPring-8. By several analyses, e.g. X-ray diffraction and differential scanning calorimetry, it had been confirmed that TbF$$_{3}$$ and boron nitride reacted at less than 1073 K even under helium gas flow environment, thus, we focused on the spectrum obtained below 1073 K. According to the curve fitting, the interionic distance obtained from the data of heating between 933 K and 1013 K was shorter than solid state. It would be surely molten state of TbF$$_3$$ - LiF (x[TbF$$_3$$] = 0.2), since the value of distance obtained, i.e. 2.26${AA}$ corresponds to the sum of ionic radii of Tb$$^{3+}$$ and F$$^-$$.

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