Study of the ternary system CaCl2–NaCl–CaO by DSC

The chloride-rich part of the ternary system CaCl2–NaCl–CaO has been investigated. Ten vertical cross sections below 20 mol% CaO were studied by differential scanning calorimetry. A liquidus surface corresponding to primary crystallisation of CaCl2 and three secondary crystallisation lines was determined. The constructed ternary phase diagram was found to be of a simple eutectic type, E=500°C (48 mol% CaCl2, 47 mol% NaCl, 5 mol% CaO) is suspected.