Mannesmann Aktiengesellschaft

Werner Hofmann

Ewald Feuerstacke

Wolfgang Reichelt

Lutz Becker

Reinhard Fuchs

Andreas Schuring

Franz-Rudolf Block

Gerhard Schaefers

Method and device for producing silicon-rich foundry iron

Process and device for closing a tap hole

Bottom electrode for a metallurgical vessel

An anode of a direct-current arc furnace is provided in the region of the bottom of the vessel, characterized in that a metallic, broom-like element, having bristles directed towards the interior of the vessel, is positioned in a region of the furnace vessel which is free of refractory material and subsequently, at least in the region of the broom-like element, refractory gunite is applied thereto and a metallic composition is admixed during the guniting, and as the thickness of the applied gunite increases, the ratio of the metallic composition to the refractory composition is reduced, gunite only being sprayed exclusively in the region of the inner edge of the ladle. The practice of the method results in a metallurgical vessel for direct-current arc equipment, which has a cathode protruding into the vessel and at least one anode disposed in the refractory lining of the vessel characterized in that, in the refractory lining at the bottom adjacent to the vessel shell, a metallic, broom-like element connected to the positive pole of the electrical energy equipment. The bristles are embedded in the refractory lining and are directed toward the interior of the vessel and the refractory lining has metallic embedments adjacent the bristles. The proportion by volume of metal embedments to refractory material is less in the part of the furnace lining facing the interior of the vessel than in the lining adjacent the shell. There are no metal embedments at the interior surface of the lining in the wear layer which contacts the melt.

Metallurgical vessel for direct-current arc equipment

A metallurgical vessel (10) includes at least one metallic electrode (20) fastened thereto having a chamber within the vessel (10) for holding a melt (19) and having a bottom surface, a shell (14) abutting the bottom surface, and a flanged tube (31) arranged on the shell (14) with the flanged tube (31) having a flanged surface (32). The electrode (20) is disposed coaxially with respect to the flanged tube (31) and is formed by first and second bars (21, 22) connectable to one another. The first bar (21) has the top face positioned proximate to the bottom surface of the chamber and penetrates the vessel (10) for contact with the melt. The second bar (22) is positioned against the bottom face of the first bar (21) and extends out from the vessel (10), the first bar having a should region (23) positioned annularly thereabout adapted to contact and lean against the flanged surface (32) of the flanged tube (31). A coolant provision and discharge device provide coolant to the second bar (22) through a coolant feed line (51) and a discharge line (53) and a current feed device provides current to the electrode. A hold-down mechanism (33) attaches the current feed device, the coolant feed line (51) and the discharge line (53) to the flanged tube (31).

Metallurgical vessel with metallic electrode having readily replaceable

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Moers, Germany

Werner Hofmann