Patents Assigned to Veitsch-Radex Aktiengesellschaft fur feuerfeste Erzeugnisse
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Patent number: 6129889Abstract: The invention concerns a gas purging bottom for metallurgical vessels, the gas purging bottom comprising a monolithic refractory ceramic lining having channels formed therein by chemical or physical processes. At their ends associated with an adjacent vessel wall, the channels are designed for direct or indirect fluid connection to a gas supply pipe. At their other ends the channels lead into the corresponding outer layer of the refractory ceramic lining.Type: GrantFiled: November 16, 1998Date of Patent: October 10, 2000Assignee: Veitsch-Radex Aktiengesellschaft fur Feuerfeste ErzeugnisseInventors: Manfred Slamenik, Franz Reiterer, Walter Hammerer, Karl-Heinz Dott, Klaus Dosinger, Michael Heiligenbrunner
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Patent number: 5911946Abstract: The present invention pertains to a snorkel for a degassing vessel, with a refractory lining and a gas-purging device arranged therein with a plurality of channels, which, distributed over the circumference of the snorkel, extend through the refractory lining in the radial direction in relation to the central longitudinal axis of the snorkel and can be connected on the outside to at least one gas supply line.Type: GrantFiled: October 14, 1997Date of Patent: June 15, 1999Assignee: Veitsch-Radex Aktiengesellschaft fur Feuerfeste ErzeugnisseInventors: Klaus Aichinger, Harald Harmuth, Heinrich Niehues, Armin Pertl
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Patent number: 5888586Abstract: The invention concerns a use for a water-containing refractory ceramic cast material based on a hydration-sensitive metal oxide such as MgO and containing carbon, a dispersing agent and a reactive silicic acid for forming a monolithic lining for a metallurgical smelting vessel.Type: GrantFiled: November 18, 1997Date of Patent: March 30, 1999Assignee: Veitsch-Radex Aktiengesellschaft Fur Feuerfeste ErzeugnisseInventor: Wilfried Eckstein
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Patent number: 5853658Abstract: A gas flushing device for a blowpipe of a degassing vessel, the blowpipe being cladded with a fire resistant material. The gas flushing device has a plurality of channels which are distributed around the circumference of the blowpipe and pass through the fire resistant cladding radially in relation to the central longitudinal axis of the blowpipe and can be connected on the outside to at least one gas feed pipe. The channels are between 0.5 and 2 mm in diameter, are spaced at intervals of less than 10 mm and can be pressurized in such a way that the gas on entering the blowpipe rises in the immediate vicinity of the blowpipe inner wall.Type: GrantFiled: April 24, 1997Date of Patent: December 29, 1998Assignee: Veitsch-Radex Aktiengesellschaft fur Feuerfeste ErzeugnisseInventors: Klaus Aichinger, Heinrich Niehues
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Patent number: 5723394Abstract: The present invention pertains to a refractory ceramic mass, consisting of 50 to 97 wt. % of sintered MgO as well as 3 to 50 wt. % of a spinel of the hercynite type.Type: GrantFiled: September 17, 1996Date of Patent: March 3, 1998Assignee: Veitsch-Radex Aktiengesellschaft Fur Feuerfeste ErzeugnisseInventors: Harald Harmuth, Roland Heindl, Josef Deutsch
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Refractory ceramic mass for lining the bottoms of electric arc furnaces and process for their repair
Patent number: 5645772Abstract: A process for repairing bottom linings of D.C. arc furnaces. A refractory ceramic mass is used for lining the bottoms of D.C. arc furnaces in the area of metallic electrodes placed therein, wherein the refractory ceramic mass comprises one or more refractory oxides, in a grain fraction of less than 8 mm and 10 to 40 wt. % of finely dispersed metallic additives in a grain fraction of less than 0.1 mm, for lining bottoms of D.C. furnaces in the area of metallic electrodes, placed within said bottoms to insure an electrically conductive contact between the refractory ceramic mass and the metallic electrodes.Type: GrantFiled: December 23, 1994Date of Patent: July 8, 1997Assignee: Veitsch-Radex Aktiengesellschaft fur Feuerfeste ErzeugnisseInventors: Franz-Adolf Petio, Wilfried Eckstein -
Patent number: 5634313Abstract: The invention relates to a cylindrical, refractory, hollow brick having tapered wall surfaces in the corner region.Type: GrantFiled: May 16, 1995Date of Patent: June 3, 1997Assignee: Veitsch-Radex Aktiengesellschaft fur Feuerfeste ErzeugnisseInventor: Gerd Mogling
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Patent number: 5628939Abstract: A process for producing fireproof, carbon-containing ceramic moldings in which an oxidic fireproof matrix material with a carbon-containing component and a polymer compound is mixed together to form a mixture, and in which the mixture is processed into moldings. The moldings subsequently are heat-treated.Type: GrantFiled: September 8, 1994Date of Patent: May 13, 1997Assignee: Veitsch-Radex Aktiengesellschaft fur Feuerfeste ErzeugnisseInventors: Franz Reiterer, Klaus Dosinger
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Patent number: 5622673Abstract: The present invention pertains to a gas purging means for wall-side installation in a metallurgical melting vessel.Type: GrantFiled: March 16, 1995Date of Patent: April 22, 1997Assignee: Veitsch-Radex Aktiengesellschaft fur Feuerfeste ErzeugnisseInventors: Alfred Reiterer, Gunther Nemecz
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Patent number: 5573987Abstract: The present invention pertains to a refractory ceramic mass, consisting of a pure magnesia component A and a component B, which consists of granules of pure magnesia, wherein the magnesia granules of component B have a ceating consisting of a refractory material whose granule size is fine compared with that of the magnesia granules and is chemically extensively inert with respect to the magnesia granule or reacts with the magnesia granule and/or itself consists of a plurality of components that are chemically reactive with one another.Type: GrantFiled: February 7, 1995Date of Patent: November 12, 1996Assignee: Veitsch-Radex Aktiengesellschaft fur feuerfeste ErzeugnisseInventors: Harald Harmuth, Roland Heindl, Josef Deutsch
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Patent number: 5569631Abstract: The present invention pertains to a refractory ceramic mass, consisting of 50 to 97 wt. % of sintered MgO as well as 3 to 50 wt. % of a spinel of the hercynite type.Type: GrantFiled: February 7, 1995Date of Patent: October 29, 1996Assignee: Veitsch-Radex Aktiengesellschaft Fur Feuerfeste ErzeugnisseInventors: Harald Harmuth, Roland Heindl, Josef Deutsch
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Patent number: 5565390Abstract: The present invention pertains to the use of a refractory ceramic brick based on MgO containing 3% to 23% of a pre-synthesized MgO.times.Al.sub.2 O.sub.3 (MA spinel) with an Al.sub.2 O.sub.3 content of 75 to 95 wt. % for lining cement rotary kilns.Type: GrantFiled: November 10, 1994Date of Patent: October 15, 1996Assignee: Veitsch-Radex Aktiengesellschaft fur feuerfeste ErzeugnisseInventor: Josef Nievoll
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Patent number: 5552354Abstract: The present invention pertains to a refractory brick based on at least one refractory metal oxide in a particle fraction of <8 mm containing 4 to 30 wt. % of a very fine refractory fraction, prepared by firing below a temperature at which the particles of the very fine refractory fraction sinter by recrystallization with grain growth.Type: GrantFiled: March 16, 1995Date of Patent: September 3, 1996Assignee: Veitsch-Radex Aktiengesellschaft fur Feuerfeste ErzeugnisseInventors: Harald Harmuth, Roland Heindl, Josef Deutsch
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Patent number: 5465943Abstract: A bottom or wall structure for a metallurgical vessel has a fireproof lining adjacent to an outer metallic envelope (10) of the vessel. The fireproof lining has on the side opposite to the metallic envelope (10) a wear lining (26) that is gas permeable in at least one of its sections and that covers with its gas permeable section at least one gas rinsing device (14) provided with an associated gas inlet (12), whereas the gas rinsing device (14) is set into a gas-tight receptacle (18).Type: GrantFiled: June 7, 1993Date of Patent: November 14, 1995Assignee: Veitsch-Radex Aktiengesellschaft fur feuerfeste ErzeugnisseInventors: Johann Rinnhofer, Robert Schmidberger, Volker Pawliska, Giorgio Cappelli