Integrated wet dust removal ultra-clean discharging device for steel slag treatment and dust removal method

The invention discloses a steel slag treatment integrated wet dust removal ultra-clean discharge device and a dust removal method.The wet dust removal ultra-clean discharge device comprises a hollow flue gas treatment tower body, and a gas inlet pipe, a multi-stage spray washer, a dehydration mechanism and a wet electric dust remover are sequentially arranged in the flue gas treatment tower body from bottom to top in the height direction; an air outlet is formed in the top of the wet-electric precipitator; the multiple stages of spray washers are arranged at equal intervals in the height direction of the flue gas treatment tower body, each stage of spray washer comprises a plurality of spray heads, the spray heads are uniformly distributed in the circumferential direction of the corresponding spray washer arrangement position, and the spray heads of the multiple stages of spray washers are arranged in a staggered mode in the circumferential direction; the three-in-one wet-process dust removal system is adopte