Solubility prediction for the HCl–MgCl2–H2O system at 40 ring operatorC and solubility equilibrium constant calculation for HCl dot operator MgCl2 dot operator 7H2O at 40 ring operatorC

The component solubilities of the HCl–MgCl2–H2O system at 40 ring operatorC were calculated by using Pitzer’s ion-interaction model and the solubility equilibrium constant of HCldot operatorMgCl2dot operator7H2O at 40 ring operatorC was evaluated according to the solubility data for the HCl–MgCl2–H2O system at −19.8, 0, 20, 25 and 50 ring operatorC. This study can provide the parameters necessary for solubility prediction for the HCl–LiCl–MgCl2–H2O system at 40 ring operatorC and supply a theoretical basis for the manufacturing process which was proposed by Gao and employed to extract MgCl2dot operator6H2O from salt lake brine.