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Precipitation of Rare Earth Chlorides in a LiC-KCl Eutectic Molten Salt  

Cho, Yung-Zun (Advaced Fuel Cycle Development, Korea Atomic Energy Research Institute)
Yang, Hee-Chul (Advaced Fuel Cycle Development, Korea Atomic Energy Research Institute)
Eun, Hee-Chul (Advaced Fuel Cycle Development, Korea Atomic Energy Research Institute)
Kim, Eung-Ho (Advaced Fuel Cycle Development, Korea Atomic Energy Research Institute)
Kim, In-Tae (Advaced Fuel Cycle Development, Korea Atomic Energy Research Institute)
Publication Information
Applied Chemistry for Engineering / v.18, no.4, 2007 , pp. 361-365 More about this Journal
Abstract
The precipitation reaction of some rare earth chlorides ($Ce/Nd/GdCl_3$) in a LiCl-KCl molten salt has been carried out by reaction with oxygen. Identification of rare earth precipitates by reaction with oxygen and effects of oxygen sparging time (max. 420 min) and molten salt temperature ($450{\sim}750^{\circ}C$) on conversion were investigated. In this study, regardless of the oxygen sparging time and the molten salt temperature, oxychlorides (REOCl) for $NdCl_3$ and $GdCl_3$, and an oxide ($REO_2$) for $CeCl_3$ are formed as a precipitate, which are identical with the estimation results of Gibbs free energy of reaction (${\Delta}G_r$). The conversion of rare-earth chlorides into insoluble precipitates was described by using a conversion ratio. The conversion ratio increased exponentially with the oxygen sparging time and finally showed asymptotic value, over 0.999 at $750^{\circ}C$ of the molten salt temperature and over 300 min of sparging time conditions. The conversion ratios were increased with the molten salt temperature. In case of $CeCl_3$, when the sparging time exceed 60 min, the values of the conversion ratio were nearly constant over 0.999 in all experimental temperature conditions.
Keywords
LiCl-KCl molten salt; oxygen sparging; rare earth element; precipitation;
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