CHEM Spray Evaporator Crystallizer, is a direct contact heat and mass transfer system which works similar to the principle of the induced draft cooling tower. The warm process slurry is sprayed against an ambient air stream, which is humidified through the removal of water from the spray and the sprayed liquid is cooled and concentrated. For increasing the evaporation rate, an external heat exchanger is utilized by adding energy to the recirculating slurry.