BOTTOM ELECTRODE OF DC ELECTRIC FURNACE AND ITS MANUFACTURE

PROBLEM TO BE SOLVED: To prevent local heating due to a current concentration, to prolong an electrode using period and to facilitate a maintenance by installing a solid electrode made of a composite material obtained by filling a magnesia refractory material as an aggregate with an iron-based alloy as a matrix at a bottom of a DC electric furnace. SOLUTION: An anode is made of an iron-base alloy 10 as a matrix and obtained by filling an MgO aggregate 11 as a refractory material. In this case, since an area occupying the alloy is relatively large, its self-heating due to an electrode concentration is prevented, thereby preventing local fusing. Since the alloy 10 is eroded as number of times of charging is increased but a steel of a residue of molten steel compensates it, its lifetime can be prolonged. In the case of a conventional magnesia carbon electrode, a molten steel component is retained on a surface of a furnace bottom so as to disturb an adherence of the magnesia carbon, but by such a this electrode structure, an eroded portion is supplemented by the dissolved iron component retained at the bottom.