Evaporative crystallization system for continuously producing low-density crystal substances from mixed solution and process thereof

The invention relates to an evaporative crystallization system for continuously producing low-density crystal substances from a mixed solution and a process thereof. The evaporative crystallization system comprises a heat exchange unit, a crystallization apparatus and a circulating device, wherein the output end of the heat exchange unit is connected with the input end of the crystallization apparatus; the output end of the crystallization apparatus is connected with the input end of the heat exchange unit by virtue of the circulating device; the heat exchange unit and the crystallization apparatus are connected with a condensing unit and further connected with a vacuum unit; the crystallization apparatus is connected with a centrifugal device; and the filtrate output end of the centrifugal device is connected with the heat exchange unit. According to the evaporative crystallization system for continuously producing low-density crystal substances disclosed by the invention, the batch production manner of batc