Coupled experimental and thermodynamic modeling study of the CaO-CaF2 system
A coupled experiment and thermodynamic modeling of the CaO-CaF2 system is conducted. Equilibration experiments using sealed Pt capsules were performed to determine the CaO and CaF2 liquidii and the solubility of CaO in solid CaF2. In addition, the eutectic and the α- to β-CaF2 polymorphic transition were investigated. For the first time, noticeable solubility of CaO in α- and β-CaF2 solids is observed above 1000 °C. The maximum solubility of CaO in solid CaF2 is about 5 mol ％ at the eutectic temperature (about 1363 °C). The discrepancies in the CaO and CaF2 liquidii among the available experimental data were resolved. A critical evaluation of all available literature experimental data and thermodynamic optimization were conducted to obtain a set of thermodynamic functions which can reproduce all available and reliable experimental phase diagram and thermodynamic data. The results of thermodynamic modeling show that the binary liquid CaO-CaF2 phase is an ideal ionic solution of O2- and F-. The thermodynamic properties of CaF2 solid solutions are described using a simple defect solution model. Based on the thermodynamic modeling and the experimental study, it is concluded that the CaO-CaF2 binary is a simple eutectic system with the eutectic reaction L (15.4 mol ％ CaO) → CaO (pure solid) + CaF2 (solid solution with 4.9 mol ％ CaO) at 1363 °C. The α- to β-CaF2 polymorphic transition is located at 1146 °C and the melting point of CaF2 at 1420 °C.
CaO-CaF2 system phase diagram experiment thermodynamic modeling
Dong-Geun Kim Marie-Aline Van Ende Christian Liebske Corrie van Hoek Seiger van der Laan Pierre Hudon In-Ho Jung
Dept. Mining and Materials Engineering, McGill University, 3610 University, Montreal, Quebec, H3A 2B ETH Zürich Institute for Geochemistry and Petrology Sonneggstrasse 5, NO E 53.2, CH-8092 Zürich Corus Research, Development and Technology, PO Box 10000, 1970 CA IJmuiden, The Netherlands
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-9
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）