The flame retardant type magnesium hydroxide has been prepared with brine,halide,and magnesium chloride hexahydrate as raw materials by two-step process(i.

• 以卤水、卤块和六水氯化镁为原料,采用两步法即氨水沉淀-水热处理过程制备出氢氧化镁+阻燃剂。