Thermodynamic Properties and Phase Equilibria in the H2O-HNO3- Ca(NO3)2-UO2(NO3)2 System

A set of Pitzer-Simonson-Clegg (PSC) parameters, along with the solubility products for the Ca(NO3)2middot2H2O, Ca(NO3)2middot3H2O, UO2(NO3)2middot2H2O, UO2(NO3)2middot3H2O, and UO2(NO3)2middot6H2O hydrates, is proposed to accurately describe the properties of the solution and solid-liquid equilibria in the H2O- HNO3-Ca(NO3)2-UO2(NO3)2 system. Literature data on solid-liquid and, where possible, vapor-liquid equilibria were utilized in the course of this study. The PSC interaction parameters for the H2O-HNO3 and H2O-Ca(NO3)2 subsystems were taken from the literature. The proposed model is valid within a wide range of temperatures and concentrations.

Automated summary

This article proposes a set of parameters to accurately describe the properties of solution and solid-liquid equilibria in the H2O-HNO3-Ca(NO3)2-UO2(NO3)2 system. The model is valid within a wide range of temperatures and concentrations, and utilizes literature data.