Solubility prediction of RbCl-Rb2SO4-H2O system at 25°C using Pitzer ion-interaction model

Solubility of RbCl-Rb₂SO₄-H₂O system at 25°C was predicted by using Pitzer ion-interaction model. The mixing parameter was was taken to be zero in the prediction. The calculated results indicated that the RbCl-Rb₂SO₄-H₂O system is a simple eutonic ternary system at 25°C. This study will provide the theoretical basis for the extraction of rubidium from salt lake brines in Qinghai and Tibet Plateau.