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Abstract

A bottom electrode (1) for d.c. arc furnaces with metal rods (3) arranged on the base plate (2) of the bottom electrode and with conductive and nonconductive layers formed of high temperature-resistant refractory material introduced between them. An upper layer formed of conductive bricks (8), a middle layer formed of conductive, monolithic lining material (9), and a lower layer formed of a nonconductive insulating mass (10) are introduced via the circumference of the base plate (2). In the area of the bricks (8), the metal rods (3) are additionally embedded in a nonconductive mass (11). To introduce inert gases to purge the melt through the bottom electrode (1), the metal rods (3) are provided with a cored hole and, in the upper part, with a number of radial holes in order for the purging gases to be able to be discharged in the area of the bricks (8), or blind holes (13), which are connected to a second purging gas line (13a), are introduced into the lower part of the lined bottom electrode (1).

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First Claim