Method for preparing magnesium sulfate and sodium chloride by high-temperature salt

　　A method for preparing magnesium sulfate and sodium chloride from high-temperature salt of waste residue in the production of potassium chloride from bittern brine chemical production in seawater system. The high-temperature salt is formulated into high-temperature salt slurry and separated by an overflow separator. Conversion washing, separation and production of magnesium sulfate hydrate containing dihydrate to heptahydrate, or high-temperature salt slurry is first converted and then separated by an overflow separator. After separation, the product is refined into magnesium sulfate and sodium chloride. The yield of magnesium sulfate is up to Above 89%, the yield of sodium chloride reaches above 92%. The method of the present invention does not add any additives, has no three waste pollutions, is reliable in technology, saves investment, and has significant economic benefits.