Continuous crystallization system and continuous crystallization method

摘要

PROBLEM TO BE SOLVED: To provide a low cost continuous crystallization system excellent in reliability, capable of downsizing a cooling crystallizer, and stably performing continuous crystallization.SOLUTION: A continuous crystallization system 3 includes: a device 5 for separating and generating potassium chloride from a first solution; a carrying-in flow path 6 for supplying the first solution to the device 5; a carrying-out flow path 7 for sending out, to the outside of the device 5, a second solution after the potassium chloride is separated and generated from the first solution; and a bypass flow path 8 for supplying a part of the first solution flowing through the carrying-in flow path 6 to the carrying-out flow path 7, bypassing the device 5. At the carrying-in flow path 6, temperature of the first solution is adjusted so as to be first temperature at which potassium and chlorine can exist as ions. At the device 5, temperature of the first solution is adjusted so as to be second temperature at which potassium chloride can be crystallized. Through the carrying-out flow path 7, a third solution is made to flow, which is obtained by making the first solution from the carrying-in flow path 6 via the bypass flow path 8 join the second solution carried out from the device 5, and adjusting temperature so as to be third temperature higher than the second temperature.