Patent
1974-11-27
1976-08-03
Envall, Jr., R. N.
13 10, F27D 104
Patent
active
039730760
ABSTRACT:
A carbon brick/graphite lined furnace for melting, containing and pouring a special purpose slag composed of about 40 percent CaF.sub.2, 30 percent CaO and 30 percent Al.sub.2 O.sub.3 or a slag composed of about 70 percent CaF.sub.2 and 30 percent Al.sub.2 O.sub.3 which has a cylindrical configuration and a roof composed of high alumina ram refractory with openings therein for receiving heating electrodes composed of graphite, for feeding dry slag into the furnace and for exhausting fumes therefrom. The furnace has a pouring spout and the roof can be raised whereby the furnace is turnable about trunions for discharging the molten slag into an electroslag remelting process mold. Both the interior lining and the next surrounding lining are composed of graphite or carbon bricks or a combination thereof. An expansion layer of insulating material, powder alumina, surrounds the second lining. Following this are two further linings of refractory material. A steel shell is provided with a layer of compressed material of high temperature insulation packed between such shell and the last layer of refractory brick. On the bottom of the furnace, two successive circular shaped graphite discs or plates are provided under which are two layers of refractory material. The steel shell at the bottom is convex and contains a further layer of castable insulating fireclay refractory. The pouring spout of the furnace comprises an upwardly inclined channel at the upper edge of the furnace which is lined with graphite brick. The last part of the channel for discharging molten slag is a readily replaceable single graphite or high alumina ram refractory block which extends outwardly from the cylindrical surface of the furnace.
REFERENCES:
patent: 842099 (1907-01-01), Landis
patent: 3218050 (1965-11-01), Healy et al.
patent: 3345059 (1967-10-01), Swindt
patent: 3835231 (1974-09-01), Marchner
Guth Charles D.
Scott, Jr. William W.
Envall, Jr. R. N.
Lukens Steel Company
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