Bottom electrode for a direct current arc furnace

Details Bottom electrode for a direct current arc furnace Bottom electrode for a direct current arc furnace

1990-11-09

1992-08-25

Reynolds, Bruce A.

Industrial electric heating furnaces

Arc furnace device

Electrode

373 36, 373 37, 373 38, 373 71, 373 72, 313331, 219119, 219120, H05B 706

Patent

active

051426501

ABSTRACT:
The service life of a bottom electrode for a direct current arc furnace for producing steel is prolonged by using ZrB.sub.2 type sintered bodies for a contacting pins which constitutes a major part of the bottom electrode wherein the ZrB.sub.2 type sintered bodies have a corrosion-resistance to molten steel and slag. Further, the number of contacting pins to be used is reduced by forming each of the pins into a form of pillar with a through hole at the axis, or by assembling a plurality of longitudinally divided pin portions to form a contacting pin, whereby the diameter of the contacting pin can be made large. Then the space between contacting pins is made broad, and brick having good corrosion-resistance are filled in the space so that the service life of the bottom electrode is brought closer to that of the refractory lining of the direct current arc furnace.

REFERENCES:
patent: 1091559 (1914-03-01), Brown
patent: 1912560 (1933-06-01), Wiles
patent: 3504219 (1970-03-01), Gejo et al.
patent: 3939028 (1976-02-01), Schiffarth et al.
patent: 4101799 (1978-07-01), Wiedijk et al.
patent: 4111765 (1978-09-01), De Nora et al.
patent: 4720838 (1988-01-01), Guido
patent: 4730337 (1988-03-01), Schubert
patent: 4740990 (1988-04-01), Rader et al.
patent: 4754464 (1988-06-01), Feuerstake
patent: 4843614 (1989-06-01), Guido

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