2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 3. Fehrmann Intl. Symp. / Molten Salt and Ionic Liquid
| Editors: | F. Kongoli, M. Haumann, P. Wasserscheid, T. Welton, M. Gaune-Escard, A. Angell, A. Riisager |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 154 pages |
| ISBN: | 978-1-987820-86-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Electrical Conductivity of Molten Mixtures of LiCl-KCl Eutectic with Lanthanide Trichlorides
Alexander Salyulev1; Alexei Potapov1; Vladimir Shishkin1;1INSTITUTE OF HIGH TEMPERATURE ELECTROCHEMISTRY, Ekaterinburg, Russian Federation;
Type of Paper: Regular
Id Paper: 102
Topic: 13
Abstract:
The aim of this work is to provide the experimental basis for the development and verification of the model of electrical conductivity of complex molten mixtures based on LiCl-KCl. This communication is a continuation of our work [1]. Such mixtures are formed at the anodic dissolution of spent nuclear fuel into the molten LiCl-KCl eutectic. To achieve this goal, we measured the electrical conductivity of molten mixtures of LiCl-KCl eutectic with CeCl<sub>3</sub>, NdCl<sub>3</sub> and CeCl<sub>3</sub> + NdCl<sub>3</sub> (1:1). The measurements were carried out over the entire concentration and in wide temperature (up to 800-950°C) ranges. The lower temperature of the measurements was 5-10 degrees below the liquidus temperature of all compositions in order to fix the onset of the crystallization temperature.
The electrical conductivity of all melts increases with temperature and decreases as the concentration of trichlorides increases. The specific electrical conductivity (S/cm) of a number of molten mixtures of LiCl-KCl eutectic with CeCl<sub>3</sub> and NdCl<sub>3</sub> is exemplified below:
k = -3.8121 + 8.5652*10-3T - 2.8313*10-6T2, (752-1076 K) 10mol.% CeCl<sub>3</sub> + 10mol.% NdCl<sub>3</sub>; k = -3.7858 + 6.8563*10-3*T - 1.7911*10-6*T2, (890-1122 K) 50.8 mol.% CeCl<sub>3</sub> ; k = -2.8669 + 4.5885*10-3*T - 8.2555*10-7*T2, (981-1102 K) 80 mol.% NdCl<sub>3</sub>.
For the mixtures under study, the density was estimated and the molar conductivity was calculated. In all molten (LiCl-KCl)eut. - LnCl<sub>3</sub> mixtures studied, the significant negative deviations (up to -40% in maximum) of molar conductivity from additive values were observed over the whole concentration range, indicating a strong complexation in the systems.