Study on physicochemical properties of U3+ in LiCl-KCl eutectic media at 773 K

被引：13

作者：

Kim, Tack-Jin ^{[1
]}

Jung, Yongju ^{[2
]}

Shim, Joon-Bo ^{[1
]}

Kim, Si-Hyung ^{[1
]}

Paek, Seungwoo ^{[1
]}

Kim, Kwang-Rak ^{[1
]}

Ahn, Do-Hee ^{[1
]}

Lee, Hansoo ^{[1
]}

机构：

[1] Korea Atom Energy Res Inst, Taejon 305353, South Korea

[2] Korea Univ Technol & Educ, Dept Appl Chem Engn, Cheonan 330780, South Korea

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2011年 / 287卷 / 01期

关键词：

U3+; Uranium ions; LiCl-KCl; Pyroprocessing; Molten salt; Molar absorptivity; Formal potential; MOLTEN NACL-2CSCL; REDOX EQUILIBRIUM; URANIUM; CHLORIDE; IONS;

D O I：

10.1007/s10967-010-0689-z

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In order to enhance the efficiency of pyrochemical technology, especially electrorefining process, physicochemical data of trivalent uranium in LiCl-KCl eutectic at 773 K were measured, including molar absorptivity, formal potential and diffusion coefficient of U3+ ions. The molar absorptivities of U3+ were determined to be 765 +/- 48 and 686 +/- 39 M-1 cm(-1) at 465 and 550 nm, respectively. The formal potential of U3+/U4+ redox couple and diffusion coefficient of U3+ ions were measured to be -0.308 V vs. Ag/Ag+ and 8.7 x 10(-6) M-1 cm(-1), respectively. To elucidate the chemical behavior of U3+ ions under the existence of oxide ions, U3+ ions were reacted with oxides ions in situ produced at the LiCl-KCl media. Surprisingly, it was revealed from XRD patterns that UO2 was formed from the reaction between U3+ ions and O2- ions with the molar ratio of 1:1.

引用

页码：347 / 350

页数：4

共 14 条

[1]

Bard AllenJ., 2001, Fundamentals and applications, V2nd

[2] On the formation of U-Al alloys in the molten LiCl-KCl eutectic [J].

Cassayre, L. ;

Caravaca, C. ;

Jardin, R. ;

Malmbeck, R. ;

Masset, P. ;

Mendes, E. ;

Serp, J. ;

Soucek, P. ;

Glatz, J. -P. .

JOURNAL OF NUCLEAR MATERIALS, 2008, 378 (01) :79-85

[3] Potentiometric study of Sm-O compounds formation in the molten LiCl-KCl eutectic at 450°C.: Determination of a E-pO2- stability diagram [J].

De Cordoba, G. ;

Caravaca, C. .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2006, 67 (08) :1862-1868

[4] Electronic absorption spectra of lanthanides in a molten chloride - 1. Molar absorptivity measurement of neodymium(III) in molten eutectic mixture of LiCl-KCl [J].

Fujii, T ;

Moriyama, H ;

Yamana, H .

JOURNAL OF ALLOYS AND COMPOUNDS, 2003, 351 (1-2) :L6-L9

[5] Electrode processes of uranium ions and electrodeposition of uranium in molten LiCl-KCl [J].

Gao Fanxing ;

Wang Changshui ;

Liu Lisheng ;

Guo Jianhua ;

Chang Shangwen ;

Chang Li ;

Li Ruixue ;

Ouyang Yinggen .

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 2009, 280 (01) :207-218

[6] OXIDATION STATES AND COMPLEX IONS OF URANIUM IN FUSED CHLORIDES AND NITRATES [J].

GRUEN, DM ;

MCBETH, RL .

JOURNAL OF INORGANIC & NUCLEAR CHEMISTRY, 1959, 9 (3-4) :290-301

[7]

Jeong SM, 2006, J RADIOANAL NUCL CH, V268, P349, DOI 10.1556/JRNC.268.2006.2.24

[8] In situ analysis for spontaneous reduction of Eu3+ in LiCl pyroprocessing media at 923 K [J].

Kim, Tack-Jin ;

Jeong, Yong-Kwang ;

Kang, Jun-Gill ;

Jung, Yongju ;

Ahn, Do-Hee ;

Lee, Han-Soo .

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 2010, 286 (01) :283-286

[9] Redox equilibrium of U4+/U3+ in molten NaCl-2CsCl by UV-Vis spectrophotometry and cyclic voltammetry [J].

Nagai, T ;

Uehara, A ;

Fujii, T ;

Shirai, O ;

Sato, N ;

Yamana, H .

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, 2005, 42 (12) :1025-1031

[10] Study on redox equilibrium of UO22+/UO2+ in molten NaCl-2CsCl by UV-Vis spectrphotometry [J].

Nagai, T ;

Fuji, T ;

Shirai, O ;

Yamana, H .

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, 2004, 41 (06) :690-695

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