Liquidus Temperatures and Thermodynamic Properties of the KCl– $$\mathrm{{KNO}}_{2}$$ KNO 2 , NaCl– $$\mathrm{{NaNO}}_{2}$$ NaNO 2 , and $$\mathrm{{KNO}}_{2}$$ KNO 2 – $$\mathrm {NaNO}_{2}$$ NaNO 2 Systems

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Potassium nitrite is very sensitive to temperature, humidity, and the atmosphere, so few studies have been made in this field for the thermodynamic properties of molten salt with nitrite salt. In this article, the liquidus curves of NaCl– $$\mathrm{{NaNO}}_{2}$$ , KCl– $$\mathrm{{KNO}}_{2}$$ , and $$\mathrm {NaNO}_{2}$$ – $$\mathrm{{KNO}}_{2}$$ are calculated by a simple “hard-sphere” ionic interaction model. The calculated liquidus temperatures show good agreement with experimental values, which implies an ideal mixing enthalpy and entropy for the liquid binary systems. In addition to the phase equilibrium data and experimental thermochemical properties of molten salt systems, the activities of these binary systems are determined by the phase diagrams and the analytical integration of the classical Gibbs–Duhem equation.