Solubility prediction in the ternary systems NaCl–RbCl–H 2O, KCl–CsCl–H 2O and KBr–CsBr–H 2O at 25 ∘C using the ion-interaction model

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The component solubilities in NaCl–RbCl–H 2O, KCl–CsCl–H 2O and KBr–CsBr–H 2O systems at 25 ∘C were calculated by using the Pitzer ion interaction model and its extended HW models. Excellent agreement with experimental solubilities indicated that the models can be successfully used to calculate the component solubilities. This study affords the necessary parameters for solubility predictions of complicated systems containing rubidium and caesium and establishes a theoretical basis for the separation of these valuable metals from salt lake brine.