Solubility in the MgSO₄–NaCl–H₂O System and Its Polythermal Diagram

The MgSO₄–NaCl–H₂O system was studied in the temperature range from –25 to 42°С by the visual polythermal method of solubility. A polythermal diagram of the solubility of this system was constructed on the basis of the solubility polytherms of binary systems and internal sections. On the phase diagram of the MgSO₄–NaCl–H₂O system the crystallization fields of ice, MgSO₄∙H₂O, MgSO₄∙6H₂O, MgSO₄∙7H₂O, MgSO₄∙12H₂O, NaCl∙H₂O, and compound of the composition MgCl₂ were delimited. The study results show that the MgSO₄–NaCl–H₂O system belongs to the complex eutonic type.