Patents Assigned to GfE Gesellschaft fur Elektrometallurgie mbH
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Patent number: 4748009Abstract: Process for the recovery of vanadium from vanadium-containing source materials under the addition of additives, especially alkali metal compounds, particularly the carbonates, chlorides, sulfates as well as nitrates and/or mixtures of these compounds, whereby the source material is ground and roasted. The roasted material is leached and whereby the withdrawn leach solution is hydrometallurgically treated for the recovery of vanadium compounds. The source materials are first roasted without the addition of alkali additives and subsequently are leached in a first leaching step. To the residues of the first leaching step are added alkali additives and the mixture is roasted in a second roasting step. The roasting products are again leached.Type: GrantFiled: October 2, 1986Date of Patent: May 31, 1988Assignee: GfE Gesellschaft fur Elektrometallurgie mbHInventors: Reinhard Hahn, Siegfried Sattelberger, Rudolf Fichte, Hans-Joachim Retelsdorf
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Patent number: 4684506Abstract: A master alloy for producing titanium-based alloys with high molybdenum content and capable of ensuring the solution and distribution of the molybdenum in the titanium based alloy consists essentially of 25 through 36% by weight molybdenum, 15 to 18% by weight vanadium, up to about 7% by weight titanium, the balance aluminum and wherein the molybdenum content is at least 1.4 times the vanadium content and the melting point is at most 1500.degree. C.Type: GrantFiled: November 6, 1985Date of Patent: August 4, 1987Assignee: GFE Gesellschaft fur Elektrometallurgie mbHInventors: Reinhard Hahn, Hermann Andorfer
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Patent number: 4662936Abstract: Nickel- and vanadium-containing catalysts or petroleum treatment of combustion residues are combined with alkali metal carbonates and/or chlorides and the resulting mixture is melted in the presence of a sulfur carrier with or without carbon which serves to reduce the sulfur to a sulfidic form, a high vanadium, low nickel slag seggregating from a high nickel, low vanadium matte. The matte and slag can be separately tapped and the melt is treated metallurgically to recover nickel while the slag is leached and is thus treated hydrochemically to recover valuable vanadium compounds.Type: GrantFiled: January 16, 1985Date of Patent: May 5, 1987Assignee: GfE Gesellschaft fur Elektrometallurgie mbHInventors: Reinhard Hahn, Hans Hess, Siegfried Sattelberger
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Patent number: 4643874Abstract: Titanium-containing hydrogen storage alloys with a Laves phase composition AB.sub.2 are made in which the A component is titanium and possibly an element from the start of the transition metal groups of the Periodic Table. According to the invention a titanium-free prealloy is first formed and this prealloy is comminuted and smelted again with addition of titanium and possibly zirconium in a second vacuum furnace stage. The latter melt is then deoxidized with cerium mischmetal. Hydrogen storage capacities of about 2% by weight and above that conventionally obtained can be made.Type: GrantFiled: March 22, 1985Date of Patent: February 17, 1987Assignee: GfE Gesellschaft fur Elektrometallurgie mbHInventors: Rudolf Fichte, Hans-Joachim Retelsdorf, Peter K. Kunert
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Patent number: 4623386Abstract: A method of making cobalt-boron and/or nickel-boron alloys in a low-shaft electrical furnace wherein the burden or charge has a height of at least 500 mm and at least a portion of its carbon carrier consists of wood chips which are carbonized to wood charcoal during the process so that the wood charcoal which is produced can adsorb volatilized boron compounds and tap them so that they do not escape. The volatilized boron compounds thus tapped are carried to the reduction zone by the wood charcoal so that a high yield is obtained and the product has a low aluminum content.Type: GrantFiled: December 13, 1985Date of Patent: November 18, 1986Assignee: GfE Gesellschaft fur Elektrometallurgie mbHInventors: Reinhard Hahn, Hans-Joachim Retelsdorf, Rudolf Fichte, Siegfried Sattelberger
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Patent number: 4605436Abstract: A master alloy of the following composition:11 to 13% by weight tin,11 to 13% by weight zirconium,22 to 24% by weight molybdenum,22 to 24% by weight chromium,less than 0.5% by weight unavoidable impurities and balance aluminum is produced and utilized as a melting electrode in the vacuum-electric-arc production of titanium alloys to produce an alloy containing the elements of the master alloy in substantially the same weight relationships and with substantial freedom from oxides and nitride inclusions. The titanium alloys which result are particularly effective for aerospace use.Type: GrantFiled: June 15, 1984Date of Patent: August 12, 1986Assignee: GfE Gesellschaft fur Elektrometallurgie mbHInventor: Hermann Andorfer
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Patent number: 4585474Abstract: A masteralloy of the following composition:10 to 12% by weight tin,21 to 23% by weight zirconium,32 to 34% by weight molybdenum,less than 0.5% by weight unavoidable impurities and balance aluminum is produced and utilized as a melting electrode in the vacuum-electric-arc production of titanium alloys to produce an alloy containing the elements of the masteralloy in substantially the same weight relationships and with substantial freedom from oxides and nitride inclusions. The titanium alloys which result are particularly effective for aerospace use.Type: GrantFiled: June 15, 1984Date of Patent: April 29, 1986Assignee: GfE Gesellschaft fur Elektrometallurgie mbHInventor: Hermann Andorfer
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Patent number: 4582530Abstract: In the production of a vanadium group valve metal powder, especially tantalum, the reaction mixture of a double fluoride salt of the valve metal and metallic sodium and/or potassium is doped with sulfur before a melt cake is formed. The melt cake is then leached with water to eliminate central salts leaving the valve metal powder. The sulfur doping provides improved surface area and particle size characteristics.Type: GrantFiled: August 6, 1984Date of Patent: April 15, 1986Assignee: GFE Gesellschaft fur Elektrometallurgie mbHInventors: Hans J. Heinrich, Meinhard Aits
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Patent number: 4569691Abstract: A method of making ferroboron or ferroborosilicon alloys in a low-shaft electrical furnace wherein the burden or charge has at least as a major portion of its carbon carrier, wood chips or particles which are carbonized to wood charcoal during the process and thus the charge has a porosity which permits adsorption action to prevent loss of volatile boron compounds. The charge also contains iron oxide and boron oxide, the electrodes of the furnace effecting a reduction of the boron oxide at a reduction zone just above the floor of the furnace.Type: GrantFiled: March 12, 1985Date of Patent: February 11, 1986Assignee: GfE Gesellschaft fur Elektrometallurgie mbHInventors: Rudolf Fichte, Friedrich Breuer, Reinhard Hahn, Hans-Joachim Retelsdorf
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Patent number: 4512958Abstract: A method of recovering molybdenum oxide as in U.S. Pat. No. 4,379,127 wherein, however, the temperature in the autoclave and the pressure therein are controlled within narrow ranges by increasing the suspension density of the molybdenum sulfide suspension fed to the autoclave upon a fall in temperature and by adding water to the slurry of molybdenum sulfide concentrate formed before introduction into the autoclave upon an increase in temperature.Type: GrantFiled: October 28, 1983Date of Patent: April 23, 1985Assignee: GfE Gesellschaft fur Elektrometallurgie mbHInventors: Gunter Bauer, Joachim Eckert
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Patent number: 4379127Abstract: A method of recovering molybdenum oxide by oxidation of a molybdenum sulfide concentrate contaminated with impurities wherein the concentrate in an average particle size in the range of 20 to 90 microns is suspended to form an aqueous suspension which is oxidized at elevated temperature and an elevated oxygen partial pressure in an autoclave. The suspension withdrawn from the autoclave is subjected to filtration to remove the molybdenum oxide from the primary filtrate containing sulfuric acid and this filtrate is neutralized with lime to form calcium sulfate which is then removed from the suspension to provide a second filtrate. According to the invention, only this second filtrate is recirculated at a rate such that the suspension density in the oxidation stage is between 100 to 150 g of solids per liter and this suspension density is maintained in the oxidation stage by the recirculation.Type: GrantFiled: October 5, 1981Date of Patent: April 5, 1983Assignee: GfE Gesellschaft fur Elektrometallurgie mbHInventors: Gunter Bauer, Joachim Eckert