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/Np couple in LiCl-KCl eutectic meltsShirai, Osamu; Iizuka, Masatoshi*; Iwai, Takashi; Arai, Yasuo
Journal of Applied Electrochemistry, 31(9), p.1055 - 1060, 2001/09
Times Cited Count：22 Percentile：47.09(Electrochemistry)no abstracts in English
/Pu couple in LiCl-KCl eutectic melts; Comparison of the electrode reaction at the surface of liquid Bi with that at a solid Mo electrodeShirai, Osamu; Iizuka, Masatoshi*; Iwai, Takashi; Arai, Yasuo
Analytical Sciences, 17(1), p.51 - 57, 2001/01
Times Cited Count：50 Percentile：81.52(Chemistry, Analytical)no abstracts in English
; ; *; *; Masaki, Toshio; Kobayashi, Hiroaki; *
PNC TN8410 98-041, 185 Pages, 1998/02
The 9
test of Joule-Heated Cylindrical Electrode Melter - Engineering Scale (JCEM-E9 Test) was carried out from June to July 1996, as a part of the development program on an advanced glass melter. The principal purpose of the test was to estimate the effect of noble metal on operation of the melter with simulated high-level liquid waste. Besides, we also evaluated the basic operational characteristics with corrosion of electrodes, qualities of produced glass etc. JCEM-E is an electric glass melter with an internal electrode and an external electrode in a subsidiary furnace. The internal electrode is a rod inserted in the center of external electrode that is a cylindrical tank. The glass is melted by conducting electric current through the molten glass between the internal and external electrodes. The subsidiary furnace is composed of multi-layer refractories inside a metallic casing and is equipped with the resistance heaters. Melting surface area is 0.35 m
that i8 approximately half of 0.66 m of TVF melter. In the test, 13 batches of glass was produced and total weight of produced glass was 3663kg. As a result, The maximum processing rate of JCEM-E with simulated HLLW including noble metals was 4.20
5.60kg/h, and decreased to less than 80 percent compared with JCEM-E8 Test with non-noble metals HLLW. It was considered that the decrease of the rate arose from concentration of current due to non-uniform distribution of noble metals in molten glass. Judging from the balance of feed and draining, and as a consequence of the observation inside the melter after the test, the draining of noble metals from the nozzle was good. As for the quality of glass produced in the test, properties of concern were comparable with those of standard glass of TVF.
Sasaki, Yuji
Kagaku To Kogyo, 45(8), p.1433 - 1434, 1992/08
no abstracts in English
*;
CRC Critical Rev.Anal.Chem., p.223 - 254, 1977/00
no abstracts in English
Bunseki Kagaku, 22(12), p.1642 - 1652, 1973/12
no abstracts in English
J.Electroanal.Chem., 45(1), p.45 - 58, 1973/01
Times Cited Count：16no abstracts in English
J.Electroanal.Chem., 45(1), p.31 - 44, 1973/01
Times Cited Count：28no abstracts in English
Co-
-irradiation on the Electrode Process of an Aluminium Metal in Water*; ; Ono, Shinichi
Nihon Kagakkai-Shi, 1973(1), p.39 - 44, 1973/01
no abstracts in English
Kitatsuji, Yoshihiro; Ouchi, Kazuki; Otobe, Haruyoshi
no journal, ,
Electrolytic reactions of Neptunium ions in a weakly acid solution were investigated by using gold electrode. It was reported previously that electrolytic reduction of Neptunium (V) ion based on mediator reaction with Np(III)/Np(IV) couple was observed in the acidic solution when bulk electrolysis was carried out at the potential around -0.2 V versus Ag/AgCl reference electrode. The reduction of Np(V), however, was not observed at the pH higher than 2. This is attributable to low reaction rate of electron exchange reaction between Np(V) and Np(III). Electrode reaction of Np(V) at more negative potential was investigated by cyclic voltammetry. The current peak due to reduction of Np(V) was observed at ca. -0.75 V, and oxidation current was appeared at +0.5 V. The reactions was determined to be reduction of Np(V) and oxidation of deposited species of reduction product of Np on the electrode. It was found that stripping current due to oxidation of deposit was saturated in spite of longer preelectrolysis time. This phenomenon is different from uranium.
Kitatsuji, Yoshihiro; Ouchi, Kazuki; Yomogida, Takumi; Otobe, Haruyoshi
no journal, ,
The electrode reactions of actinide ions such as U, Np and Pu with coupled chemical reactions have been studied to clarify the reaction mechanism of the ions in a low-acid solution. In the present study, catalytic effect of some kinds of metal hydroxide is investigated in order to elucidate the reaction mechanism of U reduction of autocatalysis. In the case of the solution coexisting Zr(IV) hydroxide, the larger reduction current of U(VI) was observed in initial stage of bulk electrolysis. This result indicates that U(VI) was reduced further to U(IV) with catalysis of Zr(IV) hydroxide. Zr(IV) is redox inactive. Thus, in the catalytic reduction of U, the metal hydroxide particle does not participate directly in electron transfer. The metal hydroxide catalyst seems to provide reaction field to reduction of U(V). The results of chemical state analysis of the U particles are also discussed.
