Method for continuously cooling and crystallizing nickel sulfate

The invention discloses a continuous cooling crystallization method for nickel sulfate. The method comprises the following steps: indirectly and continuously cooling a saturated nickel sulfate solution through cooling water to form nickel sulfate crystal slurry; nickel sulfate crystal slurry enters the crystallizer from the bottom of the crystallizer through a downcomer; nickel sulfate crystal slurry flows upwards from the bottom of the crystallizer to stir crystals at the bottom to be turned upwards, and crystal particles gradually grow up and suspend at the bottom of the crystallizer under the action of turning force, crystal gravity and fluid resistance. Through the arrangement of the crystal caching system, fine particles in crystal mush are reduced after materials in the crystallizer enter the crystal caching system from the liquid discharge pipe; a stirrer is mounted in the crystal caching system, so that the growth efficiency of small-particle crystals is improved, and large-particle clustering is avoi