THERMODYNAMIC PROPERTIES AND PHASE EQUILIBRIA IN THE H2O - HNO3 - UO2(NO3)2 SYSTEM
A set of Pitzer interaction parameters is proposed to describe the thermodynamic properties of the H2O - UO2(NO3)2 - HNO3 solution. This set is reliable at temperatures varying from 15 to 50 °C in concentration range of 0 to 40m HNO3 and 0 to 8m UO2(NO3)2. To evaluate these parameters, the following experimental data were used: vapor pressures of the volatile components, dissociation fraction of HNO3, and data on solid-liquid equilibria.