ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Phase-diagram of the system LiF-NaF-Na2SO4 and its thermodynamic analysis. 2. Calculation of the phase diagram according to the molecular model
P. Fellner, J. Gabčová, and J. Valtýni
Department of Inorganic Technology, Faculty of Chemical Technology,
Slovak Technical University, CS-8I2 37 Bratislava
Abstract: Phase diagram of the ternary reciprocal system LiF—NaF—Na2SO4 was
calculated according to the molecular model of molten salts. This model
assumes that in an ideal molten mixture electrically neutral ionic pairs
"molecules" (in this case Li+ • F-, Na+ • F -, 2Li+ • S042-, 2Na+ •S042-,
and 3Na+ • FSO43-) mix randomly. Model composition of the system, i.e.
mole fractions of ionic pairs, can be calculated taking into account simultaneous chemical equilibria among components of the molten mixture.
Using the calculated model mole fractions of components, liquidus
curves of pseudobinary systems LiF—Na2SO4 and LiF—Na2FSO4 and
liquidus surfaces in the reciprocal ternary system LiF—NaF—Na2SO4 were
calculated. Agreement between calculated and experimental data is good.
Full paper in Portable Document Format: 442a183.pdf
Chemical Papers 44 (2) 183–190 (1990)
Saturday, September 18, 2021