The process can employ magnesium chloride hexahydrate as raw material directly.

Based on quaternary phase diagram of Na+,Mg2+//Cl-,SO2-4·H2O,magnesium sulfate monohydrate and sodium chloride were prepared by using mother liquid of sodium sulfate and magnesium chloride hexahydrate as raw materials.

The preparation of white magnesium chloride hexahydrate from bittern containing high magnesium content in Yuncheng salt lake;