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| Number | Title | Issue Date |
| 7351271 | Method of manufacturing niobium and/or tantalum powder A method of manufacturing niobium and/or tantalum powder consisting of: a first-stage reduction process of reducing niobium and/or tantalum oxides with alkali metals and/or alkaline-earth metals to obtain low-grade oxide powder represented by (NbTa) Ox, where x=0.06... | 04/01/2008 |
| 7241436 | Methods to partially reduce certain metal oxides and oxygen reduced metal oxides Methods to at least partially reduce valve metal oxides are described wherein the process includes heat treating the valve metal oxide in the presence of a getter material, in an atmosphere which permits the transfer of oxygen atoms from the starting valve metal oxi... | 07/10/2007 |
| 7220397 | Modified oxygen reduced valve metal oxides Pressed material such as anodes are described and formed from oxygen reduced oxide powders using additives, such as binders and/or lubricants. Methods to form the pressed material are also described, such as with the use of atomizing, spray drying, fluid bed process... | 05/22/2007 |
| 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 |
| 6669755 | Apparatus and method for treating containerized feed materials in a liquid reactant metal A treatment apparatus (10) includes a liquid reactant metal containment vessel (11) for containing a first liquid reactant metal and isolating the reactant metal from the atmosphere. A release chamber (14) is adapted to receive the first liquid reactant m... | 12/30/2003 |
| 6406512 | Method for producing high-purity niobium A method for producing high-purity niobium involves refining crude niobium in an electrolyte comprising a melt of salts containing a complex niobium and potassium fluoride and an equimolar mixture of alkaline metal chlorides, the electrolyte further conta... | 06/18/2002 |
| 6284214 | Low or no slag molten metal processing of coke containing vanadium and sulfur A process for recovering and purifying vanadium found in petroleum coke is disclosed. Coke containing V and sulfur is charged to a molten metal bath and dissolved to form a molten metal bath with dissolved carbon, dissolved V metal and dissolved sulfur. A... | 09/04/2001 |
| 6251160 | Method of de-chroming and/or depleting the MgO content of steel slag In a process for dechroming, and/or depleting the MgO content of, steel slags, oxygen is introduced into the liquid steel slag to an extent sufficient for converting iron quantitatively to iron oxide and at least 5% by weight of the iron oxide contained i... | 06/26/2001 |
| 6241806 | Recovering vanadium from petroleum coke as dust A continuous process for recovering vanadium values from petroleum coke is disclosed. A vanadium containing coke is charged to a molten metal bath to which oxygen containing gas is added in an amount sufficient to heat balance the process and produce off ... | 06/05/2001 |
| 6238456 | Tantalum powder, method for producing same powder and sintered anodes obtained from it The present invention discloses a tantalum powder for capacitors and a method for making said tantalum powder wherein agglomerated tantalum powder is produced by means of thermal agglomeration of starting tantalum powders in the presence of hydrogen.... | 05/29/2001 |
| 6235253 | Recovering vanadium oxides from petroleum coke by melting A process for recovering and purifying vanadium found in petroleum coke is disclosed. Coke containing V and other metals such as Ni is charged to a molten metal bath and dissolved to form a molten metal bath with dissolved carbon, dissolved V metal and di... | 05/22/2001 |
| 6231689 | Valve metal compositions and method Valve metal articles such as wire, sheet or powder having a second metal, preferably in a peripheral margin, prepared by coating the valve metal with a salt solution of the metal additive and heat treating in the presence of an oxygen getter to remove the... | 05/15/2001 |
| 6231640 | Dissolving petroleum coke in molten iron to recover vanadium metal A process for the recovery of vanadium from a petroleum coke or heavy hydrocarbon feed comprising dissolving the feed in a molten metal bath to which oxygen containing gas is added to maintain heat balance and bum off carbon. Preferably the feed is added ... | 05/15/2001 |
| 6210461 | Continuous production of titanium, uranium, and other metals and growth of metallic needles This invention provides improved production, continuous or batch, especially of metals which have been produced by versions of the Kroll and Ames processses. This list includes titanium, zirconium, hafnium, vanadium, niobium, tantalum, rhenium, molybdenum... | 04/03/2001 |
| 6197082 | Refining of tantalum and tantalum scrap with carbon Tantalum scrap of high oxygen content is recovered and processed to metallurgical grade tantalum by fine participation. Blending with carbon or other appropriate solid reducing agent, melting in a plasma furnace (20) at about tantalum melt temperature whi... | 03/06/2001 |
| 6193941 | Process for producing a metallurgical raw material from oil containing heavy metals Besides a synthesis gas, a metallurgical raw material is to be produced from an oil containing heavy metals. To do this, the oil is partially oxidized and the heavy metal-containing soot is separated and burnt and the heavy metals thus occurring as ash ca... | 02/27/2001 |
| 6136062 | Niobium powder and a process for the production of niobium and/or tantalum powders The process comprises the reduction of niobium and/or tantalum oxides by means of alkaline earth metals and/or rare earth metals, wherein the first reduction stage is carried out as far as an average composition corresponding to (Nb, Ta)Ox wher... | 10/24/2000 |
| 5954856 | Method of making tantalum metal powder with controlled size distribution and products made therefrom A process for sizing (i.e., comminuting) a tantalum powder including agglomerates of smaller particles, which process yields a tantalum powder having an as-comminuted agglomerate size distribution with the product of the Volume Mean Diameter, MV (in micro... | 09/21/1999 |
| 5882375 | Process for the production of hydraulic binders and/or alloys, such as for examples, ferrochromium or ferrovanadium In a process for the production of hydraulic binders, crude steel and/or alloys, such as, e.g., FeCr or FeV, from basic steel slags containing chromium and/or vanadium, the liquid steel slag is mixed with an additive selected from the group consisting of ... | 03/16/1999 |
| 5772726 | Method of separating vanadium from ash A method of separating vanadium from waste ash including generating a high temperature thermal plasma; contacting the waste ash with the high temperature thermal plasma in the presence of oxygen, thereby forming a layer of iron from iron and iron componen... | 06/30/1998 |
| 5769922 | Method for producing vanadium-aluminum-ruthenium master alloys and master alloy compositions Vanadium-aluminum master alloys with small amounts of refractory metals such as ruthenium, are made substantially free of refractory inclusions and with a substantially homogeneous microstructure by reacting vanadium oxides with excess aluminum through an... | 06/23/1998 |
| 5575831 | Method for producing hydrogen storage alloy In a method for producing a multi-component hydrogen storage alloy including metals of zirconium or vanadium, oxides of these metals is used to produce an alloy having characteristics equivalent to that produced with pure metals. It comprises steps of cal... | 11/19/1996 |
| 5573572 | Process for the production of tantalum-niobium concentrates Process for the production of tantalum-niobium concentrates from low-tantalum, high-niobium raw materials with an Nb2 O5 /Ta2 O5 ratio of 5 to 15 in a pyrometallurgical concentration process by smelting with car... | 11/12/1996 |
| 5427603 | Method of treating a vanadium-containing residue The starting material is a vanadium-containing residue, which contains at least 5 weight percent carbon on an anhydrous basis. The residue is thermally treated in a furnace a) at temperatures from 400° to 700° C. under an oxidizing atmosphere and an O | 06/27/1995 |
| 5322548 | Recovery of niobium metal Ferroniobium, ferrotantalum and ferrovanadium alloys are hydrogenated to facilitate crushing then nitrided, and then acid-leached to produce a soluble iron nitride leachate and a niobium, tantalum or vanadium nitride residue which residue can be denitride... | 06/21/1994 |
| 5242483 | Process for the production of vanadium-containing steel alloys A process for production of vanadium-containing agglomerate, includes the steps of providing a spent, vanadium-containing, iron based hydroconversion catalyst; incinerating the spent catalyst in the presence of an oxidizer until a sulfur content of the sp... | 09/07/1993 |
| 5240495 | In situ formation of metal-ceramic oxide microstructures In situ formation of metal-ceramic oxide microstructures is carried out on a starting oxide phase containing at least a most noble metallic component (e.g., iron) and a least noble metallic component (e.g. manganese) and subjecting the starting oxide phas... | 08/31/1993 |
| 5234491 | Method of producing high surface area, low metal impurity A process for producing a high purity tantalum powder wherein a small quantity of an active ingredient, having a higher thermodynamic potential and chemical activity than the metal surfaces of the reactor vessel, is added to the reactor before the reactor... | 08/10/1993 |
| 5224986 | Procss for the recovery of titanium values This invention provides a process for the recovery of titanium values from a complex matrix comprising titanium nitride. The process comprises chlorinating the titanium nitride in the matrix to obtain a reaction product containing titanium chloride, and s... | 07/06/1993 |
| 5196048 | Process for preparing a vanadium-nickel-chromium master alloy A hydrogen battery alloy is prepared which is substantially free of inclusions of chromium by preparing a first precursor alloy or master alloy containing vanadium, nickel, and chromium using relatively equal amounts of vanadium and nickel and then adding... | 03/23/1993 |
| 5180446 | Oxide-dispersion-strengthened niobum-based alloys and process for preparing Improvement of Nb-alloys, which are known as heat-resistant alloys, by giving anti-oxidation property thereto and increasing the high temperature strength thereof. In addition to a determined amount of Al, one of (1) suitable amounts of Ti, Cr and V, and ... | 01/19/1993 |
| 5023059 | Recovery of metal values and hydrofluoric acid from tantalum and columbium waste sludge A metallurgical processing system for economically recovering metal values, such as columbium, tantalum, thorium, and uranium from dilute source solids, such as digestion sludges, by a series of steps including: 1) slurrying the source solids with dilute hydro... | 06/11/1991 |
| 5013357 | Direct production of niobium titanium alloy during niobium reduction A superconductive alloy of titanium and niobium is formed during reduction of niobium pentoxide by adding an effective quantity of titanium metal and/or titanium oxide to a reduction mixture of aluminum and niobium pentoxide. The resulting mixture is reac... | 05/07/1991 |
| 4897116 | High purity Zr and Hf metals and their manufacture The process for preparing zirconium, hafnium, vanadium, tantalum, or niobium metal comprising providing in first vessel means a eutectic solution of a chloro, bromo or iodo salt of zirconium or hafnium in a molten thermal body of one or more alkali or alk... | 01/30/1990 |
| 4877445 | Method for producing a metal from its halide A method for producing metal by the reduction of a metal halide by a reducing metal agent capable of continuously producing homogeneous metal of high purity. In the method, particles of the same metal as the metal to be produced are charged into a reactio... | 10/31/1989 |
| 4830665 | Process and unit for preparing alloyed and non-alloyed reactive metals by reduction A process for preparing alloyed or non-alloyed, reactive metals by reaction of halides thereof, in particular chlorides, with a reducing agent at a temperature higher than the melting temperature of the metal to be developed, comprises solidifying the dev... | 05/16/1989 |
| 4820339 | Production of metal powders by reduction of metal salts in fused bath In a process for the production of a metal by reducing a salt of said metal, an exchange is carried out between a reducing metal and a reducible metal within a fused salt bath under conditions in which the reducible metal in the reduced metal state is imm... | 04/11/1989 |
| 4727928 | Process for the preparation of refined tantalum or niobium Tantalum or niobium in the form of powder or pieces containing volatile impurities, e.g. sodiothermic tantalum powder, is first converted into crude cast metal by plasma melting and then the crude cast metal is refined by electron beam melting.... | 03/01/1988 |
| 4725312 | Production of metals by metallothermia The metals of Groups (IV)(B) or (V)(B) of the Periodic Table, or of the lanthanide series, e.g., titanium metal, are conveniently produced, notably in powder form, by reducing a salt of such a metal by contacting same with liquid admixture comprising lith... | 02/16/1988 |
| 4720300 | Process for producing niobium metal of an ultrahigh purity A process for producing niobium metal of an ultrahigh purity, which comprises iodizing niobium metal or niobium chloride containing at least tantalum as an impurity, thermally reducing the iodized product, and then thermally decomposing the reduced produc... | 01/19/1988 |
