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Journal Articles

Chlorination of UO$$_{2}$$ and (U,Zr)O$$_{2}$$ solid solution using MoCl$$_{5}$$

Sato, Takumi; Shibata, Hiroki; Hayashi, Hirokazu; Takano, Masahide; Kurata, Masaki

Journal of Nuclear Science and Technology, 52(10), p.1253 - 1258, 2015/10

 Times Cited Count:3 Percentile:32.14(Nuclear Science & Technology)

In order to explore the applicability of the chlorination by MoCl$$_{5}$$ as a potential pretreatment technique for waste treatment of fuel debris by pyrochemical methods, chlorination experiments of UO$$_{2}$$ and (U$$_{0.5}$$Zr$$_{0.5}$$)O$$_{2}$$ simulated fuel debris were carried out in two steps: the first one is a chlorination reaction by homogeneous heating, the second one is a volatilization of molybdenum by-product by heating under temperature gradient condition. Most of UO$$_{2}$$ and (U$$_{0.5}$$Zr$$_{0.5}$$)O$$_{2}$$ powder were converted to UCl$$_{4}$$ or UCl$$_{4}$$ and ZrCl$$_{4}$$ mixture at 573 K, respectively. In the case of (U$$_{0.5}$$Zr$$_{0.5}$$)O$$_{2}$$sintered particle, most of sample was converted to the chlorides because the products evaporated and be separated from sample surface at 773 K, while only the surface of the sample disk was converted to the chlorides at 573 and 673 K. Most of molybdenum by-product and ZrCl$$_{4}$$ were separated from UCl$$_{4}$$ by volatilization at 573 K.

Journal Articles

Decomposition behavior of PCDD/F isomers in incinerator gases under electron-beam irradiation

Hirota, Koichi; Kojima, Takuji

Bulletin of the Chemical Society of Japan, 78(9), p.1685 - 1690, 2005/09

 Times Cited Count:7 Percentile:32.98(Chemistry, Multidisciplinary)

Decomposition behavior under electron-beam irradiation was examined for polychlorinated dibenzo-p-dioxin (PCDD) and polychlorinated dibenzofuran (PCDF) isomers in incinerator gases. Significant decomposition was obtained for all PCDD isomers over the investigated absorbed doses, which was resulted from oxidation reactions with OH radicals yielded by electron-beam irradiation. In the case of PCDFs, specific isomers having symmetrical structures such as 1, 2, 8, 9-, 2, 3, 7, 8-, and 3, 4, 6, 7-TeCDFs were yielded through the dechlorination of PeCDF isomers. Thermal electrons probably played a role in the dechlorination of PeCDF isomers.

Journal Articles

Chlorination of UO$$_{2}$$, PuO$$_{2}$$ and rare earth oxides using ZrCl$$_{4}$$ in LiCl-KCl eutectic melt

Sakamura, Yoshiharu*; Inoue, Tadashi*; Iwai, Takashi; Moriyama, Hirotake*

Journal of Nuclear Materials, 340(1), p.39 - 51, 2005/04

 Times Cited Count:26 Percentile:84.93(Materials Science, Multidisciplinary)

A new chlorination method using ZrCl$$_{4}$$ in a molten salt has been investigated for the pyrometallurgical reprocessing of spent oxide fuels. UO$$_{2}$$, PuO$$_{2}$$ and rare earth oxides(La$$_{2}$$O$$_{3}$$, CeO$$_{2}$$, Nd$$_{2}$$O$$_{3}$$ and Y$$_{2}$$O$$_{3}$$) were allowed to react with ZrCl$$_{4}$$ in a LiCl-KCl eutectic salt at 500$$^{circ}$$C to give a metal chloride solution and a precipitate of ZrO$$_{2}$$. By keeping the system quite still, the solution settled so that the ZrO$$_{2}$$ precipitate could be separated.

Journal Articles

Decomposition experiment of dioxins by IR laser irradiation

Yamauchi, Toshihiko; Ito, Shinichi*; Minehara, Eisuke

Technical Digest on 4th Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim 2001), p.I_148 - I_149, 2001/00

The decomposition of dioxin analogues by infrared (IR) laser irradiation includes thermal destruction and multiple-photon dissociation. It is important for the decomposition to choose the laser wavelength which is highly absorbed. The thermal decomposition takes place by the irradiation of the low IR laser power. Considering the model of thermal decomposition, it is discussed that the adjacent water vapor assists the decomposition (dechlorination) of dioxin analogues in addition to the thermal decomposition by the direct laser absorption.

Journal Articles

Cyclodextrin addition effect on radiation-induced decomposition of chlorophenols in deoxygenated water

X.Huang*; Arai, Hidehiko; Matsuhashi, Shimpei; Miyata, Teijiro

Chemistry Letters, 0(2), p.159 - 160, 1996/00

no abstracts in English

Journal Articles

Exhaustive degradation of humic acid in water by simultaneous application of radiation and ozone

; ;

Water Res., 20(7), p.885 - 891, 1986/00

 Times Cited Count:30 Percentile:82.31(Engineering, Environmental)

no abstracts in English

Journal Articles

Major aqueous chlorination products of oxidized fulvic acid

; ;

Chem.Lett., 8, p.1435 - 1436, 1984/00

 Times Cited Count:10

no abstracts in English

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