The forced circulation evaporative crystallizer is a slurry circulation continuous crystallizer. During operation, the liquid material is added from the lower part of the circulation pipe, mixed with the crystal slurry leaving the bottom of the crystallization chamber, and then pumped to the heating chamber. The crystal slurry is heated in the heating chamber (usually 2-6 ℃), but does not evaporate. After entering the crystallization chamber, the hot crystal slurry boils, causing the solution to reach supersaturation. As a result, some solutes deposit on the surface of the suspended grains, causing the crystals to grow. The crystal slurry as a product is discharged from the upper part of the circulation tube. The forced circulation evaporative crystallizer has a high production capacity, but the particle size distribution of the product is wide.

Evaporative crystallizers are widely used for the evaporation concentration and waste liquid treatment of water or organic solvent solutions in industries such as medicine, food, chemical, and light industry, especially for heat sensitive materials.