A density model based on the Modified Quasichemical Model and applied to the (NaCl + KCl + ZnCl2) liquid

A theoretical model for the density of multicomponent inorganic liquids based on the Modified Quasichemical Model has been presented previously. By introducing in the Gibbs free energy of the liquid phase temperature-dependent molar volume expressions for the pure components and pressure-dependent excess parameters for the binary (and sometimes higher-order) interactions, it is possible to reproduce, and eventually predict, the molar volume and the density of the multicomponent liquid phase using standard interpolation methods. In the present article, this density model is applied to the (NaCl + KCl + ZnCl2) ternary liquid and a Kohler–Toop-like asymmetric interpolation method is used. All available density data for the (NaCl + KCl + ZnCl2) liquid were collected and critically evaluated, and optimized pressure-dependent model parameters have been found. This new volumetric model can be used with Gibbs free energy minimization software, to calculate the molar volume and the density of (NaCl + KCl + ZnCl2) ternary melts.

► A model for the density of multicomponent inorganic liquids.
► The density model is based on the Modified Quasichemical Model.
► Application to the (NaCl + KCl + ZnCl2) ternary liquid.
► A Kohler–Toop-like asymmetric interpolation method was used.