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| Number | Title | Issue Date |
| 7156893 | Method of making niobium and other metal powders Methods of forming niobium powders and other metal powders are described. The method involves milling the metal powders at elevated temperatures and in the presence of at least one liquid solvent. The methods of the present invention have the ability to reduce DC le... | 01/02/2007 |
| 6238453 | Producing stainless steels in parallel operated vessels A process for producing stainless steels, particularly special steels containing chromium and chromium-nickel, in a smelting arrangement having at least two vessels, for supplying a steel foundry. A charge having mostly iron-containing raw scrap materials... | 05/29/2001 |
| 6143050 | Modifying slag for smelting steel in electric arc furnaces An improved method for modifying slag in an electric arc furnace comprising introducing into the slag, or on top of the slag, vermiculite platelets which have been refined into concentrated form whereby the flakes comprise at least 50%, and more preferabl... | 11/07/2000 |
| 6007597 | Electron-beam melt refining of ferroniobium Niobium, Nb, is refined from FeNb by electron beam melt refining. The amount of the impurities in the FeNb which form suboxides with oxygen is optionally determined. Sufficient oxygen is added to form oxides with these impurities. The electron beam melt r... | 12/28/1999 |
| 5723097 | Method of treating spent potliner material from aluminum reduction cells A method of treating spent potliner material from aluminum reduction cells is disclosed. The spent potliner material is introduced into a sulfuric acid digester to produce a gas component including hydrogen fluoride and hydrogen cyanide and a slurry compo... | 03/03/1998 |
| 5702500 | Integrated process for the recovery of metals and fused alumina from spent catalysts An integrated process for the treatment of spent catalysts containing mainly molybdenum, vanadium, nickel, cobalt and, alumina to produce ammonium metavanadate, vanadium pentoxide, molybdic trioxide, fused alumina and a high grade nickel/cobalt alloy esse... | 12/30/1997 |
| 5681367 | Method of producing hot metal A method for preparing iron bearing green pellets that can be processed in a rotary hearth furnace without degradation and become self-fluxing sponge iron pellets when charged to a submerged arc furnace operating at a lower temperature than the rotary hea... | 10/28/1997 |
| 5651807 | Method for treatment of residues from organochlorosilane and/or chlorosilansynthesis The present invention relates to method for treatment of residues originating from organochlorosilanes- and/or chlorosilane syntheses. The residues are, optionally together with an oxidation agent, supplied to a smelting furnace where the residues are mel... | 07/29/1997 |
| 5476529 | Process for the recovery of magnesium from magnesium alloys waste A process for recovery of magnesium from magnesium alloy waste by charging an electric furnace with a flux including at least one salt, the flux being inert with respect to magnesium and having a melting point | 12/19/1995 |
| 5286274 | Method for treatment of potlining residue from primary aluminium smelters This is a method for treatment of spent potlining from aluminium reduction cells including the refractory material in order to transfer the spent potlining to a form in which it can be used as a filler or as a raw material. The spent potlining is crushed ... | 02/15/1994 |
| 5013533 | Process for recovering valuable metals from spent catalysts A process for recovering heavy metals from spent catalysts on an alumina support material comprising calcining the catalyst feed material to remove impurities and smelting the calcined feed in an electric arc furnace, preferably with scrap iron. A reducin... | 05/07/1991 |
| 4652306 | Method of refining molten steel by arc process Molten steel is tapped from a converter into a refining ladle, and an ore such as Nb2 O3 ore is charged into the molten steel. Then, the interior of the refining ladle is held in an inert gas atmosphere. A reducing agent such as an A... | 03/24/1987 |
| 4610720 | Method for preparing high purity vanadium A method for preparing high purity vanadium having a low silicon content has been developed. Vanadium pentoxide is reduced with a stoichiometric, or slightly deficient amount of aluminum to produce a vanadium-aluminum alloy containing an excess of oxygen.... | 09/09/1986 |
| 4572747 | Method of producing boron alloy A process for making a boron alloy from a ferrous or non-ferrous melt by adding a boron compound to the melt and reducing the compound within the melt by a reductant, such as aluminum, silicon or carbon, such that the boron can alloy with the melt. A boro... | 02/25/1986 |
| 4419127 | Metallothermal process for reducing metal oxides In order to produce metals or ferroalloys, a mixture of metal oxides, reducing agents and possibly iron is ignited, to produce a metal melt as well as a slag melt. After the burn-out the still liquid slag is reacted with a suitable means, preferably calci... | 12/06/1983 |
| 4297132 | Electroslag remelting method and flux composition An improved method is disclosed for electroslag remelting an electrode of an alloy containing at least one oxide forming ingredient, including melting such electrode in a novel flux composition containing about 1-35% boron oxide, by weight.... | 10/27/1981 |
| 4229214 | Process for combined production of ferrosilicozirconium and zirconium corundum A process for a combined production of ferrosilicozirconium and zirconium corundum comprising melting of a zirconic concentrate, an iron ore and aluminium taken in a weight ratio therebetween of 51-69:9.9-16.5:19.8-34.8 respectively at a temperature of 1,... | 10/21/1980 |
| 4216010 | Aluminum purification system A method for extracting aluminum of substantial purity from furnace products resulting from carbothermic reduction of alumina-bearing ores and contaminated with up to about 30 weight percent of aluminum carbide is disclosed. The method involves contacting... | 08/05/1980 |
| 4192674 | Method of obtaining tantalum-niobium from ores having a high titanium content A process for obtaining metal rich in tantalum and niobium from ore having a high titanium content comprising stepwise electrothermal ore reduction in the presence of aluminum, calcium oxide and barium sulfate.... | 03/11/1980 |
| 4069039 | Method for desulfurization using arc heat under vacuum An apparatus and method for consistently and economically lowering the sulfur content of steel into the 0.003/0.006 range and preferably to 0.003 maximum, which involves conditioning the steel near the end of, or immediately after, melt-down in the meltin... | 01/17/1978 |
| 4060406 | Arc steelmaking The invention provides a slag conditioner for use in electric arc steelmaking which comprises 30 to 80% by weight of alumina, 10 to 30% by weight of aluminium 5 to 40% by weight fluorspar and 0 to 20% by weight of alkali metal carbonate. The conditioner i... | 11/29/1977 |
| 4029495 | Process for recovering a heavy metal catalyst component from a spent catalyst A supported catalyst contaminated with organic impurities or a mixture of such a catalyst and a flux is introduced into a rotary furnace, rocking furnace or gradient furnace and agitated and heated therein until sintered or transformed into a semi-melted ... | 06/14/1977 |
| 4014685 | Manufacture of steel The invention is concerned with the desulphurizing of molten steel by the use of a lime-based flux. In addition to lime the flux includes sodium carbonate, an alkali metal or alkaline earth metal fluoride, typically fluorspar, alumina and a metallic reduc... | 03/29/1977 |
| 3953579 | Methods of making reactive metal silicide A method is provided for making reactive metal silicide, particularly for use in adding lanthanum or other reactive metals to metal melts, by reacting reactive metal oxide with a metal silicide or silicon in an ESR furnace.... | 04/27/1976 |
