Solid–liquid equilibria in the quaternary system NaCl–FeCl2–FeCl3–H2O

The solid–liquid phase diagram of the quaternary system NaCl–FeCl2–FeCl3–H2O has been established at 15°C, under a nitrogen blanket at a pressure of 0.10 mPa, using a synthetic method (variation of conductivity versus. composition). The wet residue and the ‘ensemble’ methods have been used in complement for the determination of eutectic points. The solubility fields of NaCl, FeCl2·4H2O and FeCl3·6H2O are observed. The sections of the diagram at constant water content are represented in projection as well as the double saturation lines and the isothermal invariant point (liquid⇔NaCl+FeCl2·4H2O+FeCl3·6H2O).