Measurement of Mineral Solubilities in the Ternary Systems NaCl–PbCl2–H2O and MgCl2–PbCl2–H2O at 373 K

Abstract

In this paper, isothermal solubility equilibrium method was used to study the mineral solubilities of two ternary systems sodium chloride-lead chloride-water and magnesium chloride-lead chloride-water at 373 K. The solubilities of the salt minerals and the densities of saturated solution in these systems were measured at 373 K. Based on the determined equilibrium solubility data and the corresponding equilibrium solid phase, the isothermal solubility diagrams of the ternary systems were shown, respectively. The results show that both the two ternary systems are simple total saturated at 373 K that neither double salt nor solid solution produced under the condition. Besides, the isothermal solubility diagrams of the two ternary systems at 373 K are both constituted of a eutectic point, two isothermal solubility curves and two solid crystalline phase regions. The two equilibrium solid phases corresponding to the eutectic point of the sodium chloride-lead chloride-water ternary system are NaCl and PbCl₂. The two equilibrium solid phases corresponding to the eutectic point of the magnesium chloride-lead chloride−water ternary system are MgCl₂ · 6H₂O and PbCl₂. The experimental result of density was simply discussed.