Dissolution kinetics and solubility limit of CaF2 in molten KClaNaCl salt

The interaction between NaClaKCl salt of an equimolar composition and CaF2 was investigated in the 1023a1123 K temperature range. The solubility limit was determined as 2.1, 2.5, and 3.4 mol.% for 1023, 1073, and 1123 K, respectively. The linear dependence of the specific weight loss with time and t...

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Bibliographic Details
Published in:Journal of materials science 2013-04, Vol.48 (8), p.3173-3176
Main Authors: Salhov, Shai, Aizenshtein, Michael, Froumin, Natalie, Barzilai, Shmuel, Frage, Nahum
Format: Article
Language:English
Subjects:
Calcium fluoride
Constraining
Density
Dissolution
Entropy
Liquids
Solubility
Thermodynamic properties
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Summary:The interaction between NaClaKCl salt of an equimolar composition and CaF2 was investigated in the 1023a1123 K temperature range. The solubility limit was determined as 2.1, 2.5, and 3.4 mol.% for 1023, 1073, and 1123 K, respectively. The linear dependence of the specific weight loss with time and the activation energy of the dissolution (124.6 A- 8.7 kJ/mol) indicate that CaF2 dissociation of the ions is the limiting stage of the process. Thermodynamic properties (partial enthalpy and entropy) of CaF2 in a dilute ternary aNaClaKClaCaF2 liquid solution were estimated using the values of the solubility limit and by applying a regular solution approach.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-012-7095-6