Calculation of thermodynamic properties of LiF-AlF3, NaF-AlF3 and KF-AlF3

Authors
Xu, Q Ma, YM Qiu, ZX
Citation
Q. Xu et al., Calculation of thermodynamic properties of LiF-AlF3, NaF-AlF3 and KF-AlF3, CALPHAD, 25(1), 2001, pp. 31-42
Citations number
22
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
ISSN journal
03645916 → ACNP
Volume
25
Issue
1
Year of publication
2001
Pages
31 - 42
Database
ISI
SICI code
0364-5916(200103)25:1<31:COTPOL>2.0.ZU;2-5
Abstract
The scheme of dissociation of cryolite in NaF-AlF3 Melts is proposed and ap plied to the LiF-AlF3 and KF-AlF3 systems. The constants and enthalpies of dissociation for alkali-cryolites are evaluated from experimental data. The mole fractions of each proposed species at 1298K in these three melt syste ms are calculated, and the variation of alumina solubility in alkali-cryoli te can be explained on the basis of the ionic structure for the MF- AlF3 (M : Li, Na and K) melts. The thermodynamic properties and liquidus data of MF -AlF3 systems are calculated by using the selected evaluated parameters. So me results are compared with experimental values.