Tb. Bechtel et Ts. Storvick, Activity coefficients of actinide and rare-earth chlorides in molten LiCl/KCl eutectic salt, IND ENG RES, 38(4), 1999, pp. 1723-1728
Using a numerical Gibbs free-energy minimization technique, the activity co
efficients of actinide and rare-earth chlorides in molten LiCl/KCl eutectic
at 450 degrees C have been calculated. Laboratory tests of an electrochemi
cal process for separating actinide metals from rare-earth metals in LiCl/K
Cl solvent at 450 degrees C provided experimental concentration and cathode
potential data. The generalized expansion by Wohl was used to express the
concentration dependence of the excess Gibbs free energy. The activity coef
ficients were expressed in terms of the Wohl volume and interaction energy
parameters. The Wohl parameters for the activity coefficient expansions wer
e obtained by minimizing the total Gibbs free energy expressed in terms of
the experimental mole fractions. This thermodynamic model will be valuable
for process design and scale-up calculations.