A slurry circulating continuous crystallizer (Figure 1). During operation, the material liquid is added from the lower part of the circulation tube, mixed with the crystal slurry leaving the bottom of the crystallization chamber, and then pumped to the heating chamber. The crystal slurry heats up in the heating chamber (usually 2-6 ℃), but does not evaporate. After the hot crystal slurry enters the crystallization chamber, it boils, causing the solution to reach a supersaturated state. As a result, some solutes deposit on the surface of suspended grains, causing the crystals to grow. As a product, the crystal slurry is discharged from the upper part of the circulation pipe. The forced circulation evaporation crystallizer has a large production capacity, but the particle size distribution of the product is relatively wide.

Crystallizer is a groove shaped container with a jacket on the wall or a snake tube inside, used to heat or cool the solution in the tank. The crystallization tank can be used as an evaporation crystallizer or a cooling crystallizer. To improve the production intensity of crystals, an agitator can be added in the tank. Crystallization tanks can be used for continuous or intermittent operations. The crystals obtained through intermittent operation are relatively large, but they are prone to forming clusters and entraining the mother liquor, which affects the purity of the product. This crystallizer has a simple structure and low production intensity, making it suitable for the production of small batch products such as chemical reagents and biochemical reagents.