Method for magnesium sulfate continuous crystallization

The invention discloses a method for magnesium sulfate continuous crystallization. The method includes the steps that a high-temperature magnesium sulfate hydrothermal solution prepared after multiple-effect evaporation of magnesium method desulfurated magnesium sulfate clear liquid enters a vacuum flash crystallizer for cooling crystallization and then enters two levels of cooling crystallizers, cooling water cooling is adopted in the first-level crystallizer, low-temperature refrigeration water cooling is adopted in the second-level crystallizer, magnesium sulfate heptahydrate is acquired through centrifugal separation of cooled magnesium sulfate liquid, and clear liquid returns to be evaporated. Magnesium sulfate production crystallization continuity is achieved, the final crystallization temperature of magnesium sulfate heptahydrate is reduced, and then the yield of magnesium sulfate is greatly increased.