METHOD FOR PERIODIC REMOVAL OF ELECTRODE IN ELECTRIC-ARC FURNACE, ELECTRODE IMPLEMENTING THIS METHOD, AND METHOD FOR ELECTRODE PREPARATION Russian patent published in 2004 - IPC

FIELD: ferrous metal industry; steal smelting in electric-arc furnaces. SUBSTANCE: method includes screwing newly prepared electrode and fitting onto electrode string; fitting has longitudinal through hole to receive metal rod, such as aluminum or copper one, which melts at working temperature of electrode string and fills up clearances in electrode-to-fitting joint and partially fills additional space in electrode body; in the process gas mixture is supplied from additional space free from liquid metal to working space of furnace through holes provided in electrode body for the purpose. Electrode implementing this method has unthreaded additional spaces axially disposed in bottom of fitting seats; these spaces have different diametric dimensions and depth and one of spaces communicates with external surface of electrode through holes. Electrode preparation method includes introduction of two-step metal rod, while screwing on electrode and fitting, in additional space of electrode and in fitting hole, metal rod being held tight against butt-end of fitting. EFFECT: reduced electrode consumption per ton of steel output. 9 cl, 7 dwg