Patents Assigned to Korf-Stahl AG.
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Patent number: 4409023Abstract: A process and a device are described for directly making liquid pig-iron from coarse iron ore. Hot sponge-iron particles are directly conveyed by a worm conveyor (17) through a communicating passage (19) from a direct-reduction blast-furnace shaft (2) into a smelter-gasifier (1), and a stream (24) of gas flows, after cooling to below 950.degree. C., in counter-current to the sponge-iron particles, from the smelter-gasifier (1) to the blast-furnace shaft (2), this gas stream having a volumetric flow-rate not more than 30 percent of the total reduction-gas flow reaching the blast-furnace shaft (FIG. 1).Type: GrantFiled: September 10, 1981Date of Patent: October 11, 1983Assignees: Korf-Stahl AG, Voest-Alpine AGInventors: Ralph Weber, Bernt Rollinger, Rolf Hauk, Michael Nagl, Bernhard Rinner
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Patent number: 4392637Abstract: Metallurgical melting apparatus with a blow-nozzle or burner capable of swivelling in different directions. The blow-nozzle or burner comprises at least one tube. The nozzle-head (12) has a bulge, in the example described a spherical calotte (13), which is retained between two ring-seats (14 and 15) (the FIGURE).Type: GrantFiled: September 10, 1981Date of Patent: July 12, 1983Assignees: Korf-Stahl AG, Voest-Alpine AGInventors: Ralph Weber, Bernt Rollinger, Michael Nagl, Bernhard Rinner
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Patent number: 4317677Abstract: A process for the production of molten crude iron and reduction gas is described wherein the molten iron and gas are formed in a smelting gasifier, to which is introduced at the upper portion thereof preheated sponge iron of particle size between 3 mm and 30 mm and coal to form a fluidized bed, and an oxygen-containing gas at the lower portion thereof, and controlling the ratio of oxygen-containing gas and coal to maintain a high temperature zone in the lower portion of the gasifier and a lower temperature zone in the upper portion thereof, the oxygen-containing gas being introduced substantially immediately above the resulting melt which is formed at the bottom of the gasifier.Type: GrantFiled: October 3, 1979Date of Patent: March 2, 1982Assignee: Korf-Stahl AG.Inventors: Ralph Weber, Emil Elsner, Walter Maschlanka, Bernt Rollinger, Gerhard Sanders
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Patent number: 4287933Abstract: Continuous metal casting method, especially continuous steel casting method, in which the melt is set in rotation about the strand axis within the continuous casting mold and gas in the gaseous or liquid state is fed onto the bath surface excentrically to the mold axis and at an acute angle to the velocity vector of the rotatory movement. The rotatory movement of the melt is brought about substantially by the thrust of the gas directed at high velocity onto the bath surface. The apparatus for the practice of the method has circumferentially of the mold, at least 2 terminal fittings of gas feed lines, whose discharge orifices are so constructed that a rotatory movement of the melt is brought about substantially by the thrust of the gas directed at high velocity against the bath surface.Type: GrantFiled: October 31, 1978Date of Patent: September 8, 1981Assignee: Korf-Stahl AGInventors: Emil Elsner, Leo Heinen
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Patent number: 4279407Abstract: An electric metallurgical furnace in which at least one row of the bricks that adjoin the annular flange the outer edge is displaced outwardly with respect to that of the bricks and the rows adjoining the annular flange are pressed by the flange on to the rows below.Type: GrantFiled: June 3, 1980Date of Patent: July 21, 1981Assignee: Korf-Stahl AGInventor: Emil Elsner
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Patent number: 4259539Abstract: Melting furnace, especially an arc melting furnace, with a bottom vessel, in which the furnace wall contains at least one water cooling box welded of steel plate and disposed above the melt level, whose surface facing the furnace interior is provided with projections which facilitate the adhesion of a refractory protective layer formed on this surface, wherein the wall of the water cooling box, which faces the furnace interior, has a thickness of at least 15 mm, the projections are formed of profile irons, and a refractory composition applied beforehand serves as the refractory protective layer. Also, a seam or flange between the upper edge of the bottom vessel and the water cooling box so as to catch water flowing down the inside of the furnace and to pass it outwardly.Type: GrantFiled: June 6, 1978Date of Patent: March 31, 1981Assignee: Korf-Stahl AGInventors: Emil A. Elsner, Dieter C. Ameling, Rolf Assenmacher, Gerhard Fuchs
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Patent number: 4256918Abstract: An electrode for electric arc furnaces, in particular for production of iron and steel, comprising a liquid-cooled upper portion, which may be inserted into an electrode holder, a lower portion forming the electrode tip being detachably fastened to the upper portion, which upper portion contains a conduit system for the cooling liquid protected by a fire-proof material, by way of which conduit system the electric current of the arc electrode may also be conducted. Heat conducting projections covered by the fire-proof material are provided on the outer surface of the conduit system facing the furnace chamber, while an electromagnet for producing a magnetic field is disposed in the region of the fastening point of the electrode tip to cause the arc on the electrode tip to move.Type: GrantFiled: June 6, 1978Date of Patent: March 17, 1981Assignee: Korf-Stahl AGInventors: William E. Schwabe, Emil Elsner, Rudolph Kasper
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Patent number: 4197422Abstract: A cover for an arc furnace having a plurality of electrodes extending through a central area of the cover, a first cooling box surrounding the electrodes and a second cooling box in the outer area surrounding the central area of the cover. The first cooling box is subdivided into a plurality of cooling areas respectively associated with the plurality of electrodes, the cooling areas being electrically insulated from each other and from the second cooling box.Type: GrantFiled: February 17, 1978Date of Patent: April 8, 1980Assignee: Korf-Stahl AGInventors: Gerhard Fuchs, Rudolf Kasper
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Patent number: 4189617Abstract: A liquid-cooled electrode for electric arc furnaces having a cover secured to an electrode supporting arm and containing cooled metal elements and having a core which can be axially displaced in the cover, into which core the electrode current can be conducted by way of a current conection. The current connection is disposed above the cover, while the cover is electrically insulated from the core and the insulation includes an insulating layer between the cover and the core. In addition, a device for producing a magnetic field is provided in the lower portion of the cover.Type: GrantFiled: July 5, 1978Date of Patent: February 19, 1980Assignee: Korf-Stahl AGInventors: William Schwabe, Emil Elsner, Rudolf Kasper
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Patent number: 4170712Abstract: An arc furnace which is supplied by means of alternating current by way of heavy-current conductors, with liftable electrode carrier arms, wherein the heavy-current conductors can be separated from each other by means of releasable electrical couplings.Type: GrantFiled: June 6, 1978Date of Patent: October 9, 1979Assignee: Korf-Stahl AGInventor: Emil Elsner
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Patent number: 4119792Abstract: Melting furnace, especially an arc melting furnace, in which the furnace wall contains at least one water cooling box welded of steel plate and disposed above the melt level, whose surface facing the furnace interior is provided with projections which facilitate the adhesion of a refractory protective layer formed on this surface, wherein the wall of the water cooling box, which faces the furnace interior, has a thickness of at least 15 mm, the projections are formed of profile irons, and a refractory composition applied beforehand serves as the refractory protective layer.Type: GrantFiled: February 4, 1977Date of Patent: October 10, 1978Assignee: Korf-Stahl AG.Inventors: Emil A. Elsner, Dieter Ch. Ameling, Rolf Assenmacher, Gerhard Fuchs