The present invention is directed to a blast furnace and a method for operating a blast furnace which are able to reduce the CO2 production and reduce the amount of applied additives and heating material when compared to presently known metallurgical plants. The cyclone dust collecting device includes a cover, first and second cyclone bodies for centrifuging and collecting contaminants entrained in the air, a lower door, and an outlet pipe. For each selected area, an electrode is positioned in proximity with the selected area.