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Characteristic of Oxidation Reaction of Lanthanide Chlorides in Oxygen-Eutectic Salt Bubble Column  

Cho, Yung-Zun (Nuclear Fuel Cycle R&D Group, Korea Atomic Energy Research Institute)
Yang, Hee-Chul (Nuclear Fuel Cycle R&D Group, Korea Atomic Energy Research Institute)
Lee, Han-Soo (Nuclear Fuel Cycle R&D Group, Korea Atomic Energy Research Institute)
Kim, In-Tae (Nuclear Fuel Cycle R&D Group, Korea Atomic Energy Research Institute)
Publication Information
Korean Chemical Engineering Research / v.47, no.4, 2009 , pp. 465-469 More about this Journal
Abstract
Characteristics of oxidation reaction of four lanthanide chlorides(Ce, Nd, Pr and $EuCl_3$) in a oxygen-eutectic(LiCl-KCl) salt bubble column was investigated. From the results obtained from the thermochemical calculations by HSC chemistry software, the most stable lanthanide compounds in the oxygen-used rare earth chlorides system were oxychlorides(EuOCl, NdOCl, PrOCl) and oxides($CeO_2$, $PrO_2$), which coincide well with results of the Gibbs free energy of the reaction. In this study, similar to the thermochemical results, regardless of the sparging time and molten salt temperature, oxychlorides for Eu, Nd and Pr and oxides for Ce and Pr were formed as a precipitant by a reaction with oxygen. The structure of the rare earth precipitates was divided into two shapes : small cubic(oxide) and large tetragonal (oxychloride) structures. The conversion efficiencies of the lanthanide elements to their molten salt-insoluble precipitates(or compound) were increased with the sparging time and temperature, and Ce showed the best reactivity. In the conditions of $650^{\circ}C$ of the molten salt temperature and 420 min of the sparging time, the conversion efficiencies were over 99% for all the investigated lanthanide chlorides.
Keywords
Bubble Column; Oxygen-Eutectic Salt; Eutectic Salt Waste; Pyroprocessing; Lanthanide; Oxidation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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