Electric smelting furnace
AssigneeIshikawajima-Harima Jukogyo Kabushiki Kaisha
InventorsShozo Yasukawa, Kenji Matsuda
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Abstract
An electric smelting furnace in which a hollow electrode with the wall thickness depending upon the depth of current penetration is disposed vertically within the furnace and spaced by a desirable distance from the furnace bottom, and the top of the hollow electrode is connected to a duct for discharging the furnace off-gases and charging the raw materials into the furnace after they are preheated by the furnace off-bases in the duct and prereduced in the hollow electrode.
Claims10
An electric smelting furnace having a vertically positioned hollow electrode therein, the lower end of the electrode being spaced a predetermined distance from the furnace bottom, the wall thickness of the electrode depending upon the depth of current penetration into the electrode as determined by the equation:
- .delta. .apprxeq. 5030 .sqroot. .rho./.mu.f (cm)
- .rho.:Specific resistance of the electrode (.OMEGA.-cm)
- .mu.:Specific permeability of the electrode
- f:Frequency, cycles per second, and conduit means for discharging furnace off-gases and for charging raw materials into the furnace through said hollow electrode, said gases serving to pre-heat the raw materials.
Dependencies are inferred from the claim text.