Silicon removal method for wastewater discharged by aerospace furnace gasification process

The invention relates to a silicon removal method for wastewater discharged by an aerospace furnace gasification process, belongs to the technical field of coal liquefaction sewage treatment, and solves the problem that the total silicon of the wastewater discharged by the aerospace furnace gasification process in the prior art does not reach the standard and the long-period operation of a systemcannot be ensured. A method combining magnesium agent silicon removal, aluminum salt coagulation and a solid-liquid separator is adopted, under the conditions that the sludge discharge amount is reduced and a settling tank with a large occupied area is not used, soluble silicon dioxide and part of colloidal silicon in water are effectively removed, and the concentration of silicon dioxide in recycled water is controlled to be 20 mg/L. The method is obvious in effect, simple in technological process, small in occupied area and convenient and reliable to control, the requirement of industrial enterprises for reducing th