Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1976-09-13
1978-07-04
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 12, C21C 552
Patent
active
040986039
ABSTRACT:
A process and apparatus are provided for producing steel of more uniform grade on a continuous basis by maintaining a comparatively thick slag layer and a larger quantity of molten steel product in an electric arc resistance furnace. This is achieved partially by including in or combined with a quantity of the charge a quantity of iron sponge, or by using a pre-reduced and/or agglomerated or otherwise pelleted ore charge. By using a charge which is comprised of comparatively small-sized particles in combination with a thick slag layer, the charge is readily assimilated into the thick slag layer. This reduces the exposure of large particle size charge material surfaces to hot spots caused by arcing at the charge-slag interface. The comparatively thick slag layer and the continuously maintained large metal bath balance and assimilate additional charge quantities to produce an ultimately more uniform product. Because of the thick slag layer, the upper surface thereof can be maintained comparatively cooler for receiving the charge, thus again reducing localized hot spots at the slag-charge interface. These factors reduce deterioration of the furnace lining and inlet feed surfaces, as well as enhancethe efficiency with which the applied electrical energy is used.
REFERENCES:
patent: 2523092 (1950-09-01), Byrk
patent: 3163521 (1964-12-01), Rinesch
patent: 3215522 (1965-11-01), Kuhlmann
Rath Gero
Roth Haye
Demag A.G.
Rosenberg Peter D.
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