Crystallizer

The crystallizer comprises a separating tank, an evaporator, a heating device and a stirring mechanism, the evaporator is arranged above the separating tank and communicated with the separating tank, a secondary steam outlet is formed in the upper position of the peripheral wall of the evaporator, a feeding port of the evaporator is connected with a first material pipe, and the first material pipe is connected with an outlet of a circulating pump; an inlet of the circulating pump is connected with one end of the second material pipe, the other end of the second material pipe is connected with a discharging port of the separating tank, one section of the first material pipe penetrates through the heating device, the heating device comprises a steam pipeline, the evaporator comprises a feeding pipe, and the feeding pipe vertically extends downwards to the position below one half of the height of the separating tank; the stirring mechanism comprises a stirring motor, a stirring rod and a stirring blade assembly.