One-time simple separation method for extracting magnesium metal from brine

The invention discloses a one-time simple separation method for extracting magnesium metal from brine. At present, most of the technologies for extracting magnesium from ore or brine at home and abroad use ore or brine, and an electrolytic method and a reduction distillation method are adopted in experimental or industrial production of magnesium ore or brine. The procedure is that: magnesium chloride in brine is subjected to electrolytic treatment, magnesium is electrolyzed at the high temperature of 620-780 DEG C, and electrolysis needs to be carried out at the high temperature; and however, a reduction distillation method needs a high temperature of more than 1000 DEG C, which does not conform to the energy-saving principle, and has the disadvantages of high power utilization cost, large resource consumption and ocean and land environmental pollution. Different from the above methods, the method of the invention adopts a chemical precipitation method at normal temperature. The process is technically charac