The process of liquid conversion of natural gypsum from «Shorsuv» deposit (SO 3 - 45.83%, CaO - 32.26% and insoluble residue - 1.58%) depending on the rate of ammonium carbonate (100; 105 and 110%) and the time of interaction of the components (5; 15 and 30 minutes) at a temperature of 50°C. The optimal rate of ammonium …