| 摘要 |
In a direct current electric arc furnace with at least one movable electrode and at least one part of the bottom of the furnace of electrically conductive material, used as a return electrode, that part of the furnace bottom is formed of an assembly of diverse coacting parts, namely: a easily removable electrically conductive prefabricated element in contact with the metal bath, an intermediate part of electrically conductive granular material, and a terminal metal part, in contact with the intermediate part, electrically insulated from the shell of the furnace, comprising a metal collector plate whose upper surface is in contact with the intermediate part, and having a terminal metal rod on the lower face. That lower face and the metal rod are in contact with a non-conductive refractory material. The extremity of the metal rod protrudes outside the furnace, is cooled and is connected to the power supply. The furnace bottom can also include at least one porous body for blowing gas into the metal bath.
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