Prediction of the component solubility in the ternary systems HCl-LiCl-H2O, HCl-MgCl2-H2O and LiCl-MgCl2-H2O at 0 degrees C and 20 degrees C using the ion-interaction model

Component solubility in HCl-LiCl-H2O- HCl-MgCl2-H2O and LiCl-MgCl2-H2O syst ems of high ionic strength at 0 degreesC and 20 degreesC are calculated by using the Pitzer's ion-interaction model and parameters derived from a leas t-squares optimization procedure which couples activity coefficient with so lubility data. Excellent agreement with experimental solubility for ternary mixtures indicates that the model can be successfully used to predict the component solubility of salt lake brine systems that contain high concentra tion of LiCl. For all of the systems containing a high concentration of HCl , measurements of the activities of the complex compounds are not available , hence, the evaluation of the values for the mixing parameters (theta) (MN ) and psi (MNX) relied on solubility data in subsystems. The prediction als o indicates that the parameters used do not vary linearly with the temperat ure, thus the algorithm used in order to calculate the parameters of LiCl a t different temperatures is presented here. Based on the predictions of the solubility, the solubility curves of six ternary systems are constructed.