Industrial electric heating furnaces – Environmental control – Arc furnace
Patent
1986-02-12
1988-01-19
Rutledge, L. Dewayne
Industrial electric heating furnaces
Environmental control
Arc furnace
266158, 373 73, C21C 538
Patent
active
047208376
ABSTRACT:
The specification discloses a ladle furnace apparatus for refining molten steel tapped from a steelmaking furnace therein. There are introduced molten steel and a slag making material into the ladle. The outer and inner lids of the ladle furnace are put on the respective receiving surfaces of the ladle to close the opening thereof. In the interior of the ladle, the slag making material is slagged by arc heating thereby to refine molten steel introduced therein by means of the slag. During the refining process, the suction of gas is carried out from a space formed between the outer lid and the inner lid. Therefore, a dust containing gas generated by reaction of the molten steel and slag enters the space between the outer lid and the inner lid passing through a gap formed between the inner lid and the ladle or electrode holes disposed in the inner lid to be sucked therefrom. Even if the open air enters the apparatus through a gap between the outer lid and the ladle, the open air does not flow inside of the inner lid. Therefore, it is possible to prevent the temperature of slag from being lowered due to the open air. In addition, it is also possible to prevent the refining efficiency of slag on the molten steel from being lowered. Consequently, refining on the molten steel can efficiently be performed.
REFERENCES:
patent: 4460164 (1984-07-01), Tivelius
Japanese Industrial Furnace Handbook, published by Tokyo Technocenter Co., Ltd., Jul. 20, 1978, p. 156.
Daidotokushuko Kabushikikaisha
Drucker William A.
McDowell Robert L.
Rutledge L. Dewayne
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