Co-crystallization of calcium sulphate and calcium carbonate

The part of investigations focused on a newly developed utilization technology of the 125 thousand cubic meters p.a. of spent solution from common salt production is presented. For this purpose, the excess mass (with respect to stoichiometry) of distiller waste CaCl2 solution from ammonia soda production has been used for degreasing of the concentration of sulphate ions in sodium chloride solution. The physical and chemical conditions of the process as well as the results of experiments of co-precipitation of gypsum and calcite are discussed, respectively.