Phase diagram of the system CaCl2–CaCO3

The chloride-rich part of the system CaCl2–CaCO3 has been investigated by differential scanning calorimetry (DSC). The phase diagram is of an eutectic type. The eutectic mixture contains 30 mol% CaCO3 and melts at 635°C. Experimental data suggest the existence of a double salt CaCl2·CaCO3, which decomposes to single salts at 628°C.