Thermodynamic Properties of CaCl2-CaF2-CaO System: Phase Diagram Investigation
Open Access
- 1 January 2021
- journal article
- Published by Scientific Research Publishing, Inc. in Materials Sciences and Applications
- Vol. 12 (04), 139-151
- https://doi.org/10.4236/msa.2021.124009
Abstract
The CaCl2-CaF2-CaO phase diagram was investigated in the CaO low region (2-CaF2 and CaCl2-CaO binary diagrams, constituting the ternary system, were first studied by Differential Scanning Calorimetry (DSC) measurements and X-Ray Diffraction (XRD) characterization; a good agreement was obtained between the phase diagram models calculated with FactSage® software (FTsalt database) and present experimental data. As the CaF2-CaO liquidus could not be measured by DSC due to the high melting temperature, this diagram was calculated using FTsalt database combined with FToxid database of FactSage® software. The ternary phase diagram was obtained by calculations and exhibits an eutectic at the composition CaCl2-CaF2-CaO (78.2-15.7-6.1 mol.%) melting at 637°C, and five peritectic points. Measurements of relevant vertical cross-sections for three CaCl2-CaF2 compositions (50-50, 40-60 and 30-70 mol.%) up to 18 mol.% CaO are in agreement with the ternary phase diagram model. For each section, the liquidus temperature is constant up to around 11 mol.% CaO and then sharply increases. Moreover, an increase of CaF2 content in CaCl2-CaF2 melt leads to a decrease of the CaO solubility in isothermal condition.Keywords
This publication has 24 references indexed in Scilit:
- Practical remarks concerning phase diagrams determination on the basis of differential scanning calorimetry measurementsJournal of Thermal Analysis and Calorimetry, 2013
- A Critical Evaluation and Thermodynamic Optimization of the CaO-CaF2 SystemMetallurgical and Materials Transactions B, 2012
- Thermodynamic evaluation and optimization of the Li, Na, K, Mg, Ca//F, Cl reciprocal system using the modified quasi-chemical modelMetallurgical and Materials Transactions, 2001
- Contributions of phase diagrams to the understanding of organized polymer-solvent systemsThermochimica Acta, 1996
- Differential Scanning CalorimetryPublished by Springer Science and Business Media LLC ,1996
- Role of CaCl2 in the reduction of PuO2Journal of Nuclear Materials, 1985
- Contribution to the phase diagram CaF2-CaO-Al2O3Archiv für das Eisenhüttenwesen, 1980
- The phase equilibrium diagram of the system CaO-Al2O3-CaF2Journal of Materials Science, 1972
- Hydrides versus fluorides: Structural comparisonsJournal of Solid State Chemistry, 1970
- Über die Ermittelung der Zusammensetzung chemischer Verbindungen ohne Hilfe der AnalyseZeitschrift für anorganische und allgemeine Chemie, 1903