Experimental Investigation and Thermodynamic Modeling Assessment of the NaCl-NaI-MgCl2-MgI2 Quaternary System
D.C. Alders (TU Delft - RST/Reactor Physics and Nuclear Materials)
Bas A.S. Rooijakkers (Student TU Delft)
R. Konings (TU Delft - RST/Reactor Physics and Nuclear Materials)
A. L. Smith (TU Delft - RST/Reactor Physics and Nuclear Materials)
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Abstract
The thermochemistry of the quaternary molten salt system NaCl-NaI-MgCl2-MgI2 has been studied using an experimental and thermodynamic modeling approach. The binary subsystems NaCl-NaI and NaCl-MgCl2 were reassessed based on existing data in the literature. The binary subsystem NaI-MgI2 was subjected to a renewed experimental investigation, to complement and revisit the data in the literature. The subsystem MgCl2-MgI2 was investigated for the first time in this work using Differential Scanning Calorimetry (DSC). Furthermore, the phase equilibria in the pseudobinary phase diagrams of NaCl-MgI2 and NaI-MgCl2 in the quaternary system were investigated by DSC, while the condensed phases in the quaternary system were investigated using X-ray diffraction (XRD). A thermodynamic model of the quaternary system was developed using the CALPHAD (CALculation of PHase Diagrams) method with the quadruplet approximation in the modified quasichemical model for the liquid phase, and two-sublattice polynomial models for the solid solution phases. With this model, the liquidus surface of the NaCl-NaI-MgCl2-MgI2 quaternary system has been described for the first time.
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