2022-Sustainable Industrial Processing Summit
SIPS2022 Volume 4 Kipouros Intl. Symp. Molten Salt, Ionic & Glass-forming Liquids & Powdered Materials
| Editors: | F. Kongoli, R. Fehrmann, V. Papangelakis, I.Paspaliaris, G. Saevarsdottir. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2022 |
| Pages: | 100 pages |
| ISBN: | 978-1-989820-40-7(CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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ELECTRICAL CONDUCTIVITY of MOLTEN (LiCl-KCl)eut. - SrCl2 MIXTURES
Alexander Salyulev1; Alexei Potapov1;1INSTITUTE OF HIGH TEMPERATURE ELECTROCHEMISTRY, Ekaterinburg, Russian Federation;
Type of Paper: Regular
Id Paper: 42
Topic: 13
Abstract:
KEYWORDS: Molten salts; Conductivity; LiCl-KCl; SrCl2.
In the course of the pyrochemical reprocessing of spent nitride nuclear fuel (SNF), multicomponent molten mixtures based on the LiCl-KCl eutectic are formed. It is impossible to measure electrical conductivity of all multicomponent mixtures, that is why a common model, which allows calculating the electrical conductivity of complex mixtures according to the electrical conductivity of binary mixtures, should be developed. The present work is a part of works aimed at the development of a model for calculation of the electrical conductivity of complex melts based on LiCl-KCl eutectic, containing components of spent nuclear fuel. In continuation of our previous studies [1, 2] in the present work the electrical conductivity of 13 compositions of (3LiCl-2KCl) - SrCl2 mixtures was measured at the temperatures of 616-1198 K in the concentration range of 0-100 mol. % with the increment of ~ 10 mol. % of SrCl2 using capillary quartz cells with platinum electrodes. The AC-bridge method at the input frequency of 75 kHz was used. The liquidus line of the system was plotted based on the conductivity data.
The values of electrical conductivity of all melts increase as the temperature increases and they decrease as the concentration of SrCl2 increases. The specific electrical conductivity (κ, S/cm) of several molten mixtures is exemplified below:
κ = -4.6316 + 1.0862*10-2T - 3.6361*10-6T2 , (625-1150 K) 10 mol.% SrCl2;
κ = -4.4607 + 9.0791*10-3T - 2.6880*10-6T2 , (773-1151 K) 40 mol.% SrCl2;
κ = -5.3748 + 9.7550*10-3T - 2.8376*10-6T2 , (983-1158 K) 70 mol.% SrCl2.
The molar conductivity was calculated using previously proposed equations for density of MCl-MeCl2 (M - alkali metals; Me - divalent metals) systems [3]. The molar conductivity of molten mixtures decreases gradually from (LiCl-KCl)eut. to pure SrCl2 with a blurred mild minimum around 70 mol.% of SrCl2 (1150 K).
The results were interpreted in terms of coexistence and mutual influence of the complexes formed by the Li+ and Sr2+ cations.
Keywords:
Chloride; Conductivity; Moltensalt;References:
[1] A. Salyulev, A. Potapov, V. Shishkin, V. Khokhlov, Electrochim. Acta 182 (2015) 821-826.
[2] A. Salyulev, A. Potapov, V. Khokhlov, V. Shishkin, Electrochim. Acta 257 (2017) 510-515.
[3] A.M. Potapov, N.G. Korosteleva, Rasplavy (Melts) 2 (2006) 21-29 (in Russian).