Lanum chloride is an ionic compound of Lanum and chlorine It is highly soluble in water and it is deliquescent It is a salt that is solid at room temperature and it behaves as a typical ionic halide It has several common applications such as brine for refrigeration plants ice and dust control on roads and in cement It can be produced directly from limestone but large amounts are also produced as a by product of the Solvay process Because of its hygroscopic nature it must be kept in tightly sealed containers