Oxidation of Lanthanum Chloride in a LiCl-KCl Eutectic Molten Salt Using the Oxygen Gas Sparging Method

Yong-Jun Cho; Hee-Chul Yang; Hee-Chul Eun; Eung-Ho Kim; Joon-Hyung Kim

Journal of Industrial and Engineering Chemistry, Vol.11, No.5, 707-711, September, 2005

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Oxidation of Lanthanum Chloride in a LiCl-KCl Eutectic Molten Salt Using the Oxygen Gas Sparging Method

Yong-Jun Cho^†, Hee-Chul Yang , Hee-Chul Eun¹, Eung-Ho Kim, and Joon-Hyung Kim

Nuclear Fuel Cycle R&D Group, Korea Atomic Energy Research Institute, Daejeon 305-600, Korea
¹Quantum Energy Chemical Engineering, University of Science and Technology, Daejeon 305-333, Korea

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The oxidation of lanthanum chloride (LaCl3) in a LiCl-KCl eutectic molten salt has been carried out using the oxygen gas sparging method. Regardless of the oxygen sparging time (maximum 420 min) and the temperature (723~1023 K), oxychloride (LaOCl) was formed as a result of oxygen gas sparging. We proved this finding through an XRD analysis of the precipitates in the molten salt. The kinetics of the oxidation reaction were estimated; first-order kinetics gave the best matches. From the reaction rates obtained, the pre-exponential parameter, A (1.529/min), and the activation energy, Ea (44.28 kJ/mol), were determined from an Arrhenius plot. The first-order reaction model evaluated in this study gave reasonable predictions for the conversion ratios of LaCl3 to LaOCl in a LiCl-KCl eutectic molten salt with respect to the sparging time and reaction temperature.

Keywords:LiCl-KCl eutectic molten salt;oxidation;reaction kinetics;conversion ratio prediction

[References]

Kang YH, Hwang SC, Shim JB, Kim EH, Yoo JH, J. Korean Ind. Eng. Chem., 14(5), 645 (2003)
Ackerman JP, Johnson TR, Chow LSH, Carls EL, Hannum WH, Laidler JJ, Prog. Nucl. Energy, 31, 141 (1997)
Mcpheeters CC, Pierce RD, Mulcahey TP, Prog. Nucl. Energy, 331, 175 (1997)
McNeese JA, Garcia E, Dole VR, Griego WJ, Accelerator-driven transmutation technologies and applications, 786 (1995)
Smith DM, Neu MP, Garcia E, Dole VR, Plutonium Futures-The Science, 532, 238 (2000)
Smith DM, Neu MP, Garcia E, Dole VR, J. Alloy. Compd., 319, 258 (2001)
Volkovich VA, Griffiths TR, Thied RC, J. Nucl. Mater., 323, 49 (2003)
Picard GS, Mottot YE, Tremillon BL, in Proc. 5th International Symposium on Molten Salts, M. L. Saboungi, K. Johnson, D. S. Newman, and D. Inman Eds., pp. 189-193, Pennington, NJ (1986)
Katayama Y, Hagiwara R, Ito Y, J. Electrochem. Soc., 142(7), 2174 (1995)
Hightower JR, McNeese LE, Ind. Eng. Chem. Process Des. Dev., 12, 232 (1973)
Kryukova AI, Masterova LY, Skiba OV, Sov. Radiochem., 32, 368 (1990)
Lee WG, Cho D, Cho IH, J. Ind. Eng. Chem., 10(6), 917 (2004)
Lee SB, Hong IK, J. Ind. Eng. Chem., 9(5), 590 (2003)

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[1] Kang YH, Hwang SC, Shim JB, Kim EH, Yoo JH, J. Korean Ind. Eng. Chem., 14(5), 645 (2003)

[2] Ackerman JP, Johnson TR, Chow LSH, Carls EL, Hannum WH, Laidler JJ, Prog. Nucl. Energy, 31, 141 (1997)

[3] Mcpheeters CC, Pierce RD, Mulcahey TP, Prog. Nucl. Energy, 331, 175 (1997)

[4] McNeese JA, Garcia E, Dole VR, Griego WJ, Accelerator-driven transmutation technologies and applications, 786 (1995)

[5] Smith DM, Neu MP, Garcia E, Dole VR, Plutonium Futures-The Science, 532, 238 (2000)

[6] Smith DM, Neu MP, Garcia E, Dole VR, J. Alloy. Compd., 319, 258 (2001)

[7] Volkovich VA, Griffiths TR, Thied RC, J. Nucl. Mater., 323, 49 (2003)

[8] Picard GS, Mottot YE, Tremillon BL, in Proc. 5th International Symposium on Molten Salts, M. L. Saboungi, K. Johnson, D. S. Newman, and D. Inman Eds., pp. 189-193, Pennington, NJ (1986)

[9] Katayama Y, Hagiwara R, Ito Y, J. Electrochem. Soc., 142(7), 2174 (1995)

[10] Hightower JR, McNeese LE, Ind. Eng. Chem. Process Des. Dev., 12, 232 (1973)

[11] Kryukova AI, Masterova LY, Skiba OV, Sov. Radiochem., 32, 368 (1990)

[12] Lee WG, Cho D, Cho IH, J. Ind. Eng. Chem., 10(6), 917 (2004)

[13] Lee SB, Hong IK, J. Ind. Eng. Chem., 9(5), 590 (2003)