Method of improving PM2.5 (particulate matter 2.5) removal efficiency in electric precipitation process of iron ore sintering smoke

The invention discloses a method of improving PM2.5 removal efficiency in an electric precipitation process of iron ore sintering smoke. The method comprises the steps of dividing the smoke generatedby sintering into sintering front section smoke (a low PM2.5 emission concentration, and mainly comprising Fe, Ca and O), sintering middle section smoke (a high PM2.5 emission concentration and mainlycomprising K, Na, Pb and Cl) and sintering rear section smoke (a low PM2.5 emission concentration and high smoke temperature), leading the sintering front section smoke and the middle section smoke into a low temperature flue and a middle temperature flue, regulating the temperature of the low temperature flue to be higher than an acid dew point and the temperature of the middle temperature flueto 180-220 DEG C via the sintering rear section smoke, spraying a smoke conditioning agent into the middle temperature flue at the same time, and removing PM2.5 from the smoke in the two flues via a conventional electrostatic p