Treatment method and device of wastewater containing superfine silicon powder

The invention discloses a treatment method and device of wastewater containing superfine silicon powder, and belongs to the field of treatment of wastewater containing silicon powder in polycrystalline silicon industry. The method comprises the following steps: with a 20%-32% NaOH solution as a precipitant, adding the wastewater containing the superfine silicon powder, flocculating the superfine silicon powder in the wastewater, and naturally participating for about an hour. By virtue of the high-concentration NaOH solution as the precipitant, the problems that silicon powder particles in the wastewater generated by the cutting process of a silicon core and the like are too small, and high in surface activity, are hydrogenated with water, suspend in water for a long period of time (over half a year) without participation, and are difficult to filter are solved; the burden of an existing filter-press process can be greatly relieved; the filtering efficiency is improved; resource utilization is realized by supernatant alkaline water and filtrate alkaline water for a chlorosilane waste gas leaching process as absorbents; meanwhile, the treatment pressure of a subsequent wastewater treatment system is relieved; and the method and the device are simple in technology in treatment of the wastewater containing the superfine silicon powder, short in flocculation and precipitation time, good in treatment effect and low in cost.