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Tanaka, Hirohisa*; Matsumura, Daiju; 10 of others*
International Journal of Hydrogen Energy, 141, p.1088 - 1097, 2025/06
Asahi, Yoshimitsu; Fukuda, Shigeki; Shiramizu, Daiki; Miyata, Koshi; Tone, Masaya; Katsuoka, Nanako; Maeda, Yuta; Aoyama, Yusuke; Niitsuma, Koichi; Kobayashi, Hidekazu; et al.
JAEA-Technology 2024-024, 271 Pages, 2025/03
JAEA-Technology-2024-024.pdf:33.98MB
JAEA-Technology-2024-024-hyperlink.zip:31.96MB
A glass melter for the vitrification process of highly active liquid waste in the Tokai Reprocessing Plant, TVF's 3rd melter, was built, and the glass of 18 vitrified waste canisters in weight was melted and poured through a cold test operation. The molten glass surface was covered by a cold cap from feeding fiberglass cartridges saturated with non-radioactive simulant liquid waste as raw material, whose components are equivalent to actual waste. Differences in inherent characteristics of the thermal behavior between the 2nd and the 3rd melter due to the difference in design were considered to establish the procedure to control the new melter. The melter's condition was stabilized at a higher glass temperature and the cooling of 1 kW less in each of the two main electrodes, compared to the 2nd one. Under 39 kW joule heating of the main electrodes with 26 Nm3/h coolant flow rate, it showed the capability to finish heating the bottom furnace in 5 hours before pouring, 2 hours shorter than the 2nd melter. Measurements of the temperature distributions in molten glass and casing surface yielded data that is efficient for developing a simulation model. After Platinum Group Elements (PGE) concentration saturates in the molten glass, feeding raw material and discharging glass were suspended to examine a holding state, indicating PGE settling could retard. During the holding test, observation of the melting process of the cold cap declared that the surface was covered by a thin layer with almost non-fluidity. It will be a reason for choosing the no-slip condition of a fluid calculation, even in the hot-top condition. The investigation of PGE discharging behavior by analyzing the elemental composition of poured glass showed the accumulated PGE amount in the 3rd melter is small compared to the 2nd melter. Inspection of the melter inside after draining out concluded that there were neither significant residual glass nor refractory fragments.
Asahi, Yoshimitsu; Shimamura, Keisuke*; Kobayashi, Hidekazu; Kodaka, Akira
JAEA-Technology 2021-026, 50 Pages, 2022/03
JAEA-Technology-2021-026.pdf:6.29MB
In Tokai Reprocessing Plant, the highly active liquid waste derived from a spent fuel reprocessing is vitrified with a Liquid-Fed Ceramic Melter (LFCM) embedded in Tokai Vitrification Facility (TVF). For an LFCM, the viscosity of melted glass is increased by the deposition of oxidation products of platinum group elements (PGE) and the PGE-containing glass tends to settle to the melter's bottom basin even after draining glass out. Removal of the PGE-containing glass is needed to avoid the Joule heating current from being affected by the glass, it requires time-consuming work to remove. For the early accomplishment of vitrifying the waste, Japan Atomic Energy Agency is planning to replace the current melter with the new one in which the amount of PGE sediments would be reduced. In the past design activities for the next melter, several kinds of shapes in regard to the furnace bottom and the strainer were drawn. Among these designs, the one in which the discharge ratio of PGE-containing glass would be as much as or greater than the current melter and which be able to perform similar operational sequences done in the current melter is selected here. Firstly, an operational sequence to produce one canister of vitrified waste is simulated for three melter designs with a furnace bottom shape, using 3D thermal-hydraulic calculations. The computed temperature distribution and its changes are compared among the candidate structures. After discussions about the technical and structural feasibilities of each design, a cone shape with a 45
slope was selected as the bottom shape of the next melter. Secondly, five strainer designs that fit the bottom shape above mentioned are drawn. For each design, the fluid drag and the discharge ratio of relatively high viscosity fluid resting near the bottom are estimated, using steady or unsteady CFD simulation. By draining silicone oil from acrylic furnace models, it was confirmed experimentally that there are no vortices
Sasaki, Yuji; Nakase, Masahiko*
Petorotekku, 43(11), p.782 - 787, 2020/11
As analog compounds of DGA (diglycolamide), MIDOA(methylimino-diacetamide) and TDGA(thia-diglycolammide) are used for the extractants of platinum group metals. These extractants can be extracted noble metals and oxyanions, which followed by HSAB theory. The high concentration of these metals can be also extracted by these compounds. The research of metal-complex structures gives the information on the ability and role for complex-formation, which will be useful for the development of novel extractants.
-decay branching ratio of 
PtCubiss, J. G.*; Harding, R. D.*; Andreyev, A. N.; Althubiti, N.*; Andel, B.*; Antalic, S.*; Barzakh, A. E.*; Cocolios, T. E.*; Day Goodacre, T.*; Farooq-Smith, G. J.*; et al.
Physical Review C, 101(1), p.014314_1 - 014314_4, 2020/01
Times Cited Count：5 Percentile：41.40(Physics, Nuclear)The -decay branching ratio of 0.52(5)% from the ground state of Pt to the ground state of the daughter nucleus 
Os has been determined more precisely than before. The Pt was produced as the 
-decay granddaughter of Hg which was produced and separated with the CERN-ISOLDE facility. The reduced -decay width calculated with the present result has provided a new picture of the systematics for the -decay width of neutron-deficient Pt isotopes.
Suzuki, Tomoya*; Ogata, Takeshi*; Tanaka, Mikiya*; Kobayashi, Toru; Shiwaku, Hideaki; Yaita, Tsuyoshi; Narita, Hirokazu*
Analytical Sciences, 35(12), p.1353 - 1360, 2019/12
Times Cited Count：5 Percentile：16.62(Chemistry, Analytical)no abstracts in English
Aihara, Haruka; Arai, Yoichi; Shibata, Atsuhiro; Nomura, Kazunori; Takeuchi, Masayuki
Procedia Chemistry, 21, p.279 - 284, 2016/12
Times Cited Count：6 Percentile：95.01(Chemistry, Inorganic & Nuclear)Chimi, Yasuhiro; Iwase, Akihiro; Iwata, Tadao*
Nuclear Instruments and Methods in Physics Research B, 209, p.159 - 164, 2003/08
Times Cited Count：3 Percentile：27.20(Instruments & Instrumentation)Accumulation of defects during energetic ion irradiation below 
10K in platinum thin films is studied by electrical resistivity measurements. Experimental results are analyzed by using a model which describes the production and selective radiation annealing of defects. For high-energy (100MeV) heavy ion irradiations, radiation annealing process due to electronic excitation is found mainly at the initial stage of irradiation. From the defect accumulation curve and defect recovery spectra, the effective temperature corresponding to the lattice agitation induced by electronic excitation is estimated.
on Pt(III)W.Wurth*; J.Stoehr*; P.Feulner*; X.Pan*; K.R.Bauchspiess*; Baba, Yuji; D.Menzel*
Physical Review Letters, 65(19), p.2426 - 2429, 1990/11
Times Cited Count：227 Percentile：97.64(Physics, Multidisciplinary)no abstracts in English
; Shimizu, Saburo; Nakajima, Hayato; Ikezoe, Yasumasa;
Int.J.Hydrogen Energy, 12(8), p.555 - 559, 1987/08
Times Cited Count：5 Percentile：61.71(Chemistry, Physical)no abstracts in English
Katsuta, Hiroji; ;
Journal of Nuclear Materials, 115(2-3), p.206 - 210, 1983/00
Times Cited Count：25 Percentile：89.39(Materials Science, Multidisciplinary)no abstracts in English
; ; ; ;
Journal of Chemical Physics, 63(9), p.4078 - 4079, 1975/09
Times Cited Count：18no abstracts in English
Ueda, Yuki
no journal, ,
The separation and recovery of PGM is carried out by a hydrometallurgy process mainly based on a solvent extraction method. In recent years, development of alternative solvents for such volatile organic solvents has been advanced. Ionic liquids (IL) has attracted substantial interest in many fields as a green alternative solvent due to their non-volatile, non-flammable, and thermally stable properties. Task-specific ionic liquids (TSIL) that functionalized by incorporating ligating group can give the extraction ability for metal ions. Many extraction systems using IL and TSIL aimed at separating PGM have been reported so far, however there is no extraction system that achieves individual separation of Pd and Pt by one type of TSIL. In this study, imidazolium bis(trifluoromethanesulfonyl) imide type TSIL incorporating a urea group was synthesized and its extraction ability for Pd and Pt was evaluated from a viewpoint the individual separation of Pd and Pt.
Ueda, Yuki
no journal, ,
Palladium (Pd) and platinum (Pt) are actively used in the wide fields such as automobile and chemical industries due to its remarkable functionality. Therefore, the efficient recycling from the secondary resources is important to ensure stable supply of Pd and Pt resources. In particular, ionic liquid functionalized by organic synthesis is called Task-specific IL(TSIL), and TSIL would be possible to have an extraction ability and a high IL affinity. In this study, urea-substituted TSIL was designed and synthesized for the purpose of mutual separation of Pd(II) and Pt(IV) and its extraction performance was evaluated. In practice, urea-substituted TSIL selectively extracted Pd(II) at pH 4 and Pt(IV) at pH 1 from Pd(II) and Pt(IV) coexisting aqueous solution. In this presentation, slope analysis, EXAFS, UV-Vis, and FT-IR studies on the extraction mechanism of Pd(II) and Pt(IV) are also reported.
Tsuchida, Yusuke; Matsumiya, Masahiko*; Sasaki, Yuji; Akama, Takeshi*; Arita, Yuji*
no journal, ,
We study the solvent extraction of soft acid metals, e.g., platinum metals, gold and silver from nitric and hydrochloric acids by commercially available organic compounds with low solubility in water. We would like to know some of the physical parameters obtained from DFT calculations can support the experimental results. The present work show that the extractants having S-donor give high extractability for gold.
