Method for preparing basic magnesium chloride whisker by using dolomite and bittern as raw materials

　 The invention discloses a method for preparing basic magnesium chloride whiskers by using dolomite and bittern as raw materials. It mainly includes the following steps: first, calcining and acidifying the natural dolomite to obtain dolomite forging powder and dolomite acid solution, respectively; mixing the dolomite acid solution with bittern to remove sulfate ions in the bittern to obtain a mixed solution; The mixed solution is reacted with the dolomite calcined powder in a certain proportion, and the basic magnesium chloride whisker is obtained after aging, and the waste liquid generated during the preparation process can be recycled. The method for preparing basic magnesium chloride whiskers proposed by the present invention uses natural dolomite and bittern as raw materials. The source is wide, the price is low, the production process is simple, and the resources are recycled. The dolomite and bittern are fully utilized. The basic magnesium chloride whisker obtained from the resources of calcium and magnesium is a kind of filler and flame retardant with broad application prospects.