Chromium(cr), Molybdenum(mo), Or Tungsten(w), Singly Or In Combination Patents (Class 75/623)
  • Patent number: 10006362
    Abstract: The invention provides a vapor cracking catalyst, an application of the vapor cracking catalyst, and a preparation method of the vapor cracking catalyst. In addition, the invention also provides a direct combustion method of a hydrogen gas obtained by vapor cracking. A plenty of cheap raw materials are adopted to prepare the catalyst provided by the invention and it leads to lower cost for production. In addition, the catalyst provided by the invention is capable of controlling the vapor cracking speed steadily so that the hydrogen gas is produced steadily and occurrence of explosion accidents is avoided effectively. The direct combustion method of a hydrogen gas obtained by vapor cracking provided by the invention truly achieves for the first time the fancy of producing hydrogen energy by water.
    Type: Grant
    Filed: September 22, 2013
    Date of Patent: June 26, 2018
    Inventor: Huaichao Chen
  • Patent number: 9689067
    Abstract: Provided is a method by which a low-oxygen and high-density molybdenum target can be efficiently obtained, while fully utilizing the characteristics of each molybdenum (Mo) starting material powder. The present invention provides a method for producing a molybdenum target, wherein a mixed powder that is obtained by mixing a molybdenum powder A, which is prepared by reducing molybdenum oxide and then crushing the resulting so as to have an average particle diameter of 2-15 ?m, and a molybdenum powder B, which is prepared by crushing a molybdenum bulk starting material having a density of not less than 6.64×10 (kg/m3) so as to have an average particle diameter of 50-2,000 ?m, is sintered under pressure.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: June 27, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Kazuya Saitoh, Tomoyuki Hata, Masashi Kaminada, Hiroshi Takashima
  • Patent number: 8979975
    Abstract: Disclosed is a method of producing low oxygen-content molybdenum powders by reducing molybdenum trioxide, which includes charging a first reducing agent and the molybdenum trioxide, which are in the direct contact with each other on a micro-sieve on an upper portion of a bracket in a body, charging a second reducing agent in the bracket under the micro-sieve, coupling the body with a cover to close the body, and performing a reduction reaction by raising an internal temperature of the body by performing the first reduction reaction due to direct contact between the first reducing agent and the molybdenum trioxide, and performing the second reduction reaction due to evaporation of the second reducing agent. The first and second reduction reactions are performed at a temperature in a range of 550° C. to 650° C., and a temperature in a range of 1000° C. to 1200° C., respectively.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: March 17, 2015
    Assignee: Korea Institute of Geoscience and Mineral Resources
    Inventors: Hyung-Seok Kim, Jung-Min Oh, Chang-Youl Suh, Back-Kyu Lee, Jae-Won Lim
  • Publication number: 20150040728
    Abstract: Carbothermic reduction of magnesium oxide at approximately 2200 degrees Kelvin yields a high temperature mixture of magnesium vapors and carbon monoxide gas. Previous processes have sought to cool or alter the mixture to cause the yield of pure magnesium, which is then used in subsequent processes for its reducing properties. The present invention takes advantage of the stability and inertness of carbon monoxide at elevated temperatures enabling the magnesium vapor/carbon monoxide gas mixture from the carbothermic process to be used directly for the production of other metals at high temperatures. For example, Chromium oxide or chloride, manganese oxide or chloride, zinc oxide or chloride or sulfide, and several other metal compounds can be reduced by the magnesium vapor/carbon monoxide gas mixture at temperatures high enough to prevent the gas mixture from back-reacting to magnesium oxide and carbon.
    Type: Application
    Filed: August 29, 2014
    Publication date: February 12, 2015
    Inventor: John Joseph Barsa
  • Publication number: 20150013496
    Abstract: The invention relates to a pelletising feed containing chromite ore, at least one nickel salt, and silicon carbide as the only carbonaceous material and the only reducing agent. The invention also relates to process for manufacturing the pelletising feed comprising the steps providing chromite, at least one nickel salt and silicon carbide, and mixing chromite, at least one nickel salt and silicon carbide. The invention also relates to use of the pelletising feed as a starting material for the manufacture of sintering feed. The invention also relates to a sintering feed in the form of pellets containing the pelletising feed. The invention also relates to sintered pellets containing the sintering feed. The invention also relates to process for manufacturing the sintered pellets. The invention also relates to use of the sintered pellets as a component of smelting feed. The invention also relates to smelting feed comprising sintered pellets.
    Type: Application
    Filed: November 15, 2011
    Publication date: January 15, 2015
    Inventors: Helge Krogerus, Pasi Mäkelä
  • Patent number: 8920535
    Abstract: A separation and recovery method that enables titanium and tungsten to be separated and recovered from a used DeNOx catalyst in high yield. Specifically, a method of separating and recovering metal elements that includes a first heating step of heating a DeNOx catalyst containing titanium, tungsten, vanadium and iron in a chlorine atmosphere, thereby removing the vanadium and the iron from the DeNOx catalyst, and a second heating step, performed after the first heating step, of heating the DeNOx catalyst in a chlorine atmosphere while the catalyst is exposed to a gas of a hydrocarbon compound (excluding CH4) or an oxygen-containing carbon compound, thereby volatilizing the tungsten and the titanium from the DeNOx catalyst, and recovering the tungsten and the titanium from the DeNOx catalyst.
    Type: Grant
    Filed: April 23, 2013
    Date of Patent: December 30, 2014
    Assignees: Mitsubishi Heavy Industries, Ltd., National University Corporation Akita University
    Inventors: Masashi Kiyosawa, Katsumi Nochi, Norihisa Kobayashi, Kozo Iida, Katsuyasu Sugawara, Yuuki Mochizuki
  • Publication number: 20140363331
    Abstract: A ductile alloy is provided comprising molybdenum, chromium and aluminum, wherein the alloy has a ductile to brittle transition temperature of about 300 C after radiation exposure. The invention also provides a method for producing a ductile alloy, the method comprising purifying a base metal defining a lattice; and combining the base metal with chromium and aluminum, whereas the weight percent of chromium is sufficient to provide solute sites within the lattice for point defect annihilation.
    Type: Application
    Filed: February 27, 2014
    Publication date: December 11, 2014
    Applicant: United States Department of Energy
    Inventor: Brian V. Cockeram
  • Publication number: 20140251084
    Abstract: A method for reducing a chromium containing material, comprising: combining the chromium containing material comprising chromium oxide with a carbonaceous reductant to form a chromium containing mixture; delivering the chromium containing mixture to a moving hearth furnace and reducing the chromium containing mixture to form a reduced chromium containing mixture; delivering the reduced chromium containing mixture to a smelting furnace; and separating the reduced chromium containing mixture into chromium metal and slag. The method also comprises agglomerating the chromium containing mixture in a granulator or the like. The chromium containing mixture has an average particle size of less than about 200 mesh (about 75 ?m).
    Type: Application
    Filed: March 6, 2014
    Publication date: September 11, 2014
    Applicant: MIDREX TECHNOLOGIES, INC.
    Inventors: Vincent F. CHEVRIER, Russell KAKALEY
  • Patent number: 8685137
    Abstract: The invention relates to a process for producing an iron-and/or tungsten containing powder or powder agglomerate including the steps of: a) mixing at least a first powder fraction comprising a tungsten carbide containing powder, and at least a second powder fraction comprising an iron oxide powder and/or a tungsten oxide containing powder and optionally an iron powder, the weight of the first fraction being in the range of 50-90% by weight of the mix and the weight of the second fraction being in the range of 10-50% by weight of the mix, b) heating the mix of step a) to a temperature in the range of 400-1300° C., preferably 1000-1200° C. The invention also relates to an iron-and/or tungsten containing powder or powder agglomerate.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: April 1, 2014
    Assignee: Minpro Aktiebolag
    Inventor: Johan Arvidsson
  • Publication number: 20130125707
    Abstract: Process for melting scrap metal in a furnace comprising the steps of feeding a charge of solid scrap metal to the furnace, supplying fuel and an oxygen-rich oxidant to the furnace and combusting the fuel with the oxidant to generate heat inside the furnace, melting the charge of solid scrap metal in the furnace by means of the heat, withdrawing the molten metal from the furnace. Following the step of feeding the charge of solid scrap metal to the furnace, the fuel is combusted with the oxidant so as to generate one or more visible flames in the furnace above the charge and before the step of withdrawing the molten metal from the furnace, the fuel is combusted with the oxidant so as to generate flameless combustion in the furnace above the molten metal.
    Type: Application
    Filed: July 28, 2011
    Publication date: May 23, 2013
    Applicant: L'Air Liquide Societe Anonyme Pour L'Elide Et L'Exploitation Des Procedes Georges Claude
    Inventors: Luc Jarry, Remi Tsiava
  • Publication number: 20120301383
    Abstract: The present invention relates to new compositions of matter, particularly metals and alloys, and methods of making such compositions. The new compositions of matter exhibit long-range ordering and unique electronic character.
    Type: Application
    Filed: March 20, 2012
    Publication date: November 29, 2012
    Inventor: Christopher J. Nagel
  • Patent number: 8287804
    Abstract: In the method for recovering a metal from a target that contains a metal and a metal oxide, the target contains a sintered body of the metal oxide after being heated under a condition of melting the metal without melting or decomposing the metal oxide. The target is heated in an upper crucible of a two-level crucible that includes the upper crucible with a through hole-formed in a bottom surface thereof, and a lower crucible disposed below the through hole, the size of the through hole being set such that it does not allow the sintered body of the metal oxide contained in the target to pass therethrough, and the melted metal is caused to flow into the lower crucible, so that the metal is separated from the metal oxide.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: October 16, 2012
    Assignee: Tanaka Holdings Co., Ltd
    Inventors: Toshiya Yamamoto, Takanobu Miyashita, Kiyoshi Higuchi, Yasuyuki Goto
  • Publication number: 20120174709
    Abstract: Provided is a manufacturing method of ferromolybdenum from molybdenite concentrate, and more particularly, a manufacturing method of ferromolybdenum with copper content of 0.5% or less from molybdenite with high copper content without carrying out a separate copper removing process by putting molybdenite, aluminum metal and iron metal, in a heating furnace and reacting them at high temperature to manufacture the ferro molybdenum at the lower portion thereof, forming a slag using aluminum sulfide and iron sulfide as the main components at the upper portion thereof, and putting most of the copper (80 to 95%) existing in the molybdenite in a slag layer. The exemplary embodiment can shorten a process as compared to a metallothermic reduction (Thermit) method of the related art and reduce the consumption of a reducing agent, i.e., aluminum.
    Type: Application
    Filed: October 20, 2010
    Publication date: July 12, 2012
    Applicant: Korea Institute of Geoscience and Mineral Resources (KIGAM)
    Inventors: Young Yoon Choi, Sang Bae Kim, Chang Youl Suh, Chul Woo Nam
  • Publication number: 20120111150
    Abstract: A process for the selective recovery of Mo, V, Ni, Co and Al from spent hydroprocessing catalysts includes the steps of treating the spent catalysts to recovery metals, support as well as chemicals. The process steps include deoiling, decoking, washing, dissolving, complexing agent treatment, acid treatment and solvent extraction. This process uses limited steps than conventional processes by the use of ultrasonic agitation for metal extraction and the presence of a chelating agent particularly Ethylene Diamine Tetra-Acetic Acid (EDTA). The process also discloses the compete recovery of the extracting agent EDTA with high purity for reuse.
    Type: Application
    Filed: November 10, 2010
    Publication date: May 10, 2012
    Inventor: Meena Marafi
  • Patent number: 8147586
    Abstract: Method for producing molybdenum metal powder. The invention includes introducing a supply of ammonium molybdate precursor material into a furnace in a first direction and introducing a reducing gas into a cooling zone in a second direction opposite to the first direction. The ammonium molybdate precursor material is heated at an initial temperature in the presence of the reducing gas to produce an intermediate product that is heated at a final temperature in the presence of the reducing gas, thereby creating the molybdenum metal powder comprising particles having a surface area to mass ratio of between about 1 m2/g and about 4 m2/g, as determined by BET analysis, and a flowability of between about 29 s/50 g and 86 s/50 g as determined by a Hall Flowmeter. The molybdenum metal powder is moved through the cooling zone.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: April 3, 2012
    Assignee: Climax Engineered Materials, LLC
    Inventors: Loyal M. Johnson, Jr., Sunil Chandra Jha, Patrick Ansel Thompson
  • Patent number: 8137654
    Abstract: Provided is a roasting method capable of reducing both C and S components in minerals down to 0.5% or less, respectively, and securing a yield ratio of 90% or more for the Mo component. In a rotary kiln 7, a V, Mo and Ni containing material containing C and S components is subjected to oxidizing roasting to remove the C and S components from the material before reducing the material by means of a reducing agent in order to recover valuable metals composed of V, Mo and Ni. The rotary kiln is equipped with a burner 11 disposed on a material charge side 8a of the roasting furnace 8 to which the material is charged. In the roasting furnace, a direction along which the material moves and a flow of oxygen-containing gas introduced into the roasting furnace 8 are set to be parallel with each other.
    Type: Grant
    Filed: February 21, 2006
    Date of Patent: March 20, 2012
    Assignees: JFE Material Co., Ltd., Sumitomo Heavy Industries, Ltd.
    Inventors: Kenji Takahashi, Hiroichi Sugimori, Nobuo Ehara
  • Publication number: 20120006157
    Abstract: A simple, compact burner achieves a more optimal melting of a solid charge followed by performance of combustion under distributed combustion conditions. The burner achieves this by fluidically bending the flame towards the solid charge during a melting phase with an actuating jet of oxidant, redirecting the flame in a direction away from the charge, and staging injection of oxidant among primary and secondary portions during a distributed combustion phase.
    Type: Application
    Filed: December 31, 2010
    Publication date: January 12, 2012
    Inventors: Vivek GAUTAM, Kenneth KAISER, Luc JARRY, Remi Pierre TSIAVA
  • Publication number: 20110243784
    Abstract: In the method for recovering a metal from a target that contains a metal and a metal oxide, the target contains a sintered body of the metal oxide after being heated under a condition of melting the metal without melting or decomposing the metal oxide. The target is heated in an upper crucible of a two-level crucible that includes the upper crucible with a through hole-formed in a bottom surface thereof, and a lower crucible disposed below the through hole, the size of the through hole being set such that it does not allow the sintered body of the metal oxide contained in the target to pass therethrough, and the melted metal is caused to flow into the lower crucible, so that the metal is separated from the metal oxide.
    Type: Application
    Filed: December 8, 2009
    Publication date: October 6, 2011
    Applicant: TANAKA HOLDINGS CO., LTD.
    Inventors: Toshiya Yamamoto, Takanobu Miyashita, Kiyoshi Higuchi, Yasuyuki Goto
  • Patent number: 7988760
    Abstract: There is described a method of making a nanocrystalline tungsten powder that comprises: (a) heating a tungsten-containing material in a reducing atmosphere at an intermediate temperature of from about 600° C. to about 700° C. for an intermediate time period; the tungsten-containing material being selected from ammonium paratungstate, ammonium metatungstate or a tungsten oxide; and (b) increasing the temperature to a final temperature of about 800° C. to about 1000° C. for a final time period.
    Type: Grant
    Filed: February 25, 2008
    Date of Patent: August 2, 2011
    Assignee: Global Tungsten & Powders Corp.
    Inventors: Hans-Joachim Lunk, Henry J. Stevens
  • Publication number: 20100326237
    Abstract: The present invention relates to new compositions of matter, particularly metals and alloys, and methods of making such compositions. The new compositions of matter exhibit long-range ordering and unique electronic character.
    Type: Application
    Filed: February 23, 2010
    Publication date: December 30, 2010
    Inventor: Christopher J. Nagel
  • Patent number: 7785390
    Abstract: Molybdenum metal powder has surface-area-to-mass-ratios in a range of between about 1.0 meters2/gram (m2/g) and about 3.0 m2/g, as determined by BET analysis, in combination with a particle size wherein at least 30% of the particles are larger than a size +100 standard Tyler mesh sieve. A method for producing molybdenum metal powder includes providing a supply of ammonium molybdate and a reducing gas; causing an exothermic reaction between the ammonium molybdate and the reducing gas at a first temperature to produce an intermediate reaction product and a supplemental reducing gas; causing an endothermic reaction between the intermediate reaction product and the reducing gas at a final temperature to produce the molybdenum metal powder.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: August 31, 2010
    Assignee: Climax Engineered Materials, LLC
    Inventors: Loyal M. Johnson, Jr., Sunil Chandra Jha, Carl Cox, Patrick Ansel Thompson
  • Patent number: 7722804
    Abstract: In a method of manufacturing a pressed scandate dispenser cathode, firstly, scandium nitrate, barium nitrate, calcium nitrate, aluminum nitrate and ammonium metatungstate (AMT) are dissolved in de-ionized water, respectively, and then mixed with a solution of a cross-link agent such as citric acid and H2O2. After water bathing, the mixed aqueous solution turns into gel, and the powders are obtained after the gel calcination. Secondly, the calcined powders are reduced by hydrogen. Finally, the reduced powders are pressed into shapes and then sintered in the furnace with the atmosphere of hydrogen or by Spark Plasma Sintering (SPS 3.202-MK-V) in vacuum.
    Type: Grant
    Filed: August 8, 2007
    Date of Patent: May 25, 2010
    Assignee: Beijing University of Technology
    Inventors: Jinshu Wang, Wei Liu, Meiling Zhou, Yiman Wang, Hongyi Li, Tieyong Zuo
  • Patent number: 7678326
    Abstract: An apparatus for manufacturing fine particles includes a reactor; a first inlet part including at least one port introducing a reactive gas flow containing a fine particle source material; a second inlet part including at least one port introducing a diluting gas flow; a heater exciting the fine particle source material in the reactive gas flow; a first plate including through-holes which substantially equalize a flow rate of the reactive gas flow with respect to a cross section of a flow channel; a second plate including through-holes which substantially equalize a flow rate of the diluting gas flow with respect to a cross section of a flow channel; a gas exhaust port provided in a merging region where the reactive gas flow passed through the first plate and the diluting gas flow passed through the second plate are merged; and a collector which collects fine particles.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: March 16, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Isao Matsui
  • Patent number: 7641713
    Abstract: A method for reducing the chromium content from a metallurgical slag, in which the slag is charged onto an iron bath in the liquid state and the reduction of Cr is effected by the iron bath having a C content of 2 to 4% by weight, wherein a) the Cr-containing slag having a Cr content of 2 to 20% by weight is charged onto an iron bath having a C content of below 1% by weight, whereupon b) the carbon content of the iron bath is raised to about 2 to 4% by weight by the addition of carbon carriers at the simultaneous supply of energy, c) the liquid slag having a Cr content of about 0.1% by weight is tapped after the reduction of Cr, d) a cooling agent, preferably scrap, is added to the iron melt and the C content of the melt is lowered to below 1% by weight, and e) a portion of the Cr-containing melt is tapped in the liquid state, while the remaining portion is left in the converter in the liquid state for the treatment of the subsequent melt.
    Type: Grant
    Filed: May 18, 2005
    Date of Patent: January 5, 2010
    Assignee: Holcim Technology Ltd.
    Inventor: Markus Tschudin
  • Patent number: 7513930
    Abstract: In the method of producing metals or metal alloys of high purity, in particular metallic chromium, granules of metal containing non-metallic inclusions and a reducing agent are treated under predetermined conditions of temperature and pressure so that the reducing agent reacts on the inclusions. During the treatment, the granules (26) are placed in a crucible (2) having an opening (14), and a wall (4) presenting at least one orifice (24).
    Type: Grant
    Filed: January 20, 2003
    Date of Patent: April 7, 2009
    Assignee: Delachaux S.A.
    Inventor: Philippe Liebaert
  • Patent number: 7297323
    Abstract: A method of manufacturing fine particles of the invention includes introducing a reactive gas flow containing a fine particle source material into a reactor from one side, growing fine particles in a gas phase by heating the fine particle source material in the reactive gas flow, introducing a diluting gas flow into the reactor from another side being almost counter-flow to the reactive gas flow, equalizing flow rates of the reactive gas flow and the diluting gas flow substantially with respect to a cross section of a flow channel, and then stopping growth of the fine particles by merging the reactive gas flow and the diluting gas flow.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: November 20, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Isao Matsui
  • Patent number: 7192467
    Abstract: Novel forms of molybdenum metal, and apparatus and methods for production thereof. Novel forms of molybdenum metal are preferably characterized by a surface area of substantially about 2.1 m2/g to substantially about 4.1 m2/g. Novel forms of molybdenum metal are also preferably characterized by a relatively uniform size.
    Type: Grant
    Filed: November 20, 2003
    Date of Patent: March 20, 2007
    Assignee: Climax Engineered Materials, LLC
    Inventors: Mohamed Khan, Joel Taube, Loyal M. Johnson, Jr.
  • Patent number: 6855189
    Abstract: In a method for removing chromium oxide and nickel oxide, and combinations thereof, from liquid slags or slag mixtures, in which the liquid slag is A charged onto a metal bath, in particular an iron bath, and reduced by feeding carbon or carbon carriers, the carbon feed into the metal bath is effected until a decrease of the Cr and/or Ni oxide contents of the slag to a value of between 0.8 wt.-% and 0.2 wt.-%. As the pregiven Cr and/or Ni oxide content range of the slag is reached, reductants having higher reduction potentials such as, e.g., Al, Ca, Si, Fe—Si or Ca—Si are added in order to lower the Cr and/or Ni oxide contents to below 0.15 wt.-%, preferably below 0.08 wt.-%.
    Type: Grant
    Filed: January 18, 2001
    Date of Patent: February 15, 2005
    Assignee: Holcim Ltd.
    Inventor: Alfred Edlinger
  • Publication number: 20040112176
    Abstract: Novel forms of molybdenum metal, and apparatus and methods for production thereof. Novel forms of molybdenum metal are preferably characterized by a surface area of substantially about 2.1 m2/g to substantially about 4.1 m2/g. Novel forms of molybdenum metal are also preferably characterized by a relatively uniform size.
    Type: Application
    Filed: November 20, 2003
    Publication date: June 17, 2004
    Inventors: Mohamed Khan, Joel Taube, Loyal M. Johnson
  • Patent number: 6679931
    Abstract: A method for recovering metallic chromium from slags which contain chromium oxide from converter processes, such as AOD, MRP, AOD-L, MRP-L, CLU, ASM, Conarc stainless steel or vacuum processes, such as VOD, SS-VOD, RH, RH with lanze, includes drawing off the slag which is produced at the end of a blowing or treatment operation in a converter or a vacuum installation in unreduced form. The slag is charged into an electric furnace, which is also charged with a standard charge of scrap and, if appropriate, dust residues. Carbon and, if appropriate, silicon are additionally added to the electric furnace.
    Type: Grant
    Filed: April 9, 2002
    Date of Patent: January 20, 2004
    Assignee: SMS Demag AG
    Inventors: Karl Götzinger, Jan Reichel
  • Patent number: 6669755
    Abstract: 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 metal from the containment vessel (11) and a submerging arrangement (21) is adapted to dunk or submerge a container (46) of feed material into the liquid reactant metal and move the container to a release location within the release chamber (14). Relatively light materials rising from the submerged container (46), including unreacted feed material, intermediate reaction products, and perhaps final reaction products collect in a collection area (60) having an upper surface defined by an upper surface of the release chamber (14).
    Type: Grant
    Filed: June 4, 2002
    Date of Patent: December 30, 2003
    Assignee: Clean Technologies International Corporation
    Inventor: Anthony S. Wagner
  • Publication number: 20030213338
    Abstract: Novel forms of molybdenum metal, and apparatus and methods for production thereof. Novel forms of molybdenum metal are preferably characterized by a surface area of substantially 2.5 m2/g. Novel forms of molybdenum metal are also preferably characterized by a relatively uniform size.
    Type: Application
    Filed: June 18, 2003
    Publication date: November 20, 2003
    Inventors: Mohamed H. Khan, Joel A. Taube
  • Patent number: 6626976
    Abstract: Novel forms of molybdenum metal, and apparatus and methods for production thereof. Novel forms of molybdenum metal are preferably characterized by a surface area of substantially 2.5 m2/g. Novel forms of molybdenum metal are also preferably characterized by a relatively uniform size. Preferred embodiments of the invention may comprise heating a precursor material to a first temperature in the presence of a reducing gas, and increasing the first temperature at least once to reduce the precursor material and form the molybdenum metal product.
    Type: Grant
    Filed: November 6, 2001
    Date of Patent: September 30, 2003
    Assignee: Cyprus Amax Minerals Company
    Inventors: Mohamed H. Khan, Joel A. Taube
  • Patent number: 6582493
    Abstract: A method for recycling thoriated tungsten objects such as thoriated tungsten scrap resulting from the fabrication of electrodes for lamps. The thoriated tungsten objects are oxidized, homogenized by mixing and chemically reduced under a hydrogen gas atmosphere to form thoriated tungsten. This method eliminates the need to separate the tungsten from its dopants. The thoriated tungsten obtained as the end product is returned to the production process and is preferably used as a raw material for the production of welding electrodes or thoriated tungsten discharge lamp electrodes.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: June 24, 2003
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventor: Dieter Meiss
  • Publication number: 20030110886
    Abstract: A metal having a high chromium content, characterized in that it is produced in an arc melting furnace and contains Cr in an amount of 85% or more and has an Al content of 0.005% or less, an Si content of 0.1% or less and an S content of 0.002% or less; and a method for producing the metal having a high chromium content which comprises reducing a chromium oxide heated and melted in an arc melting furnace with Si, to thereby prepare a metal melt containing 85% or more of CR, discharging a slag formed by the reduction with Si from the arc melting furnace, adding a fresh basic flux into the arc melting furnace, melting the basic flux with arc, to bring a slag formed by the melting of the basic flux to contact with the above metal melt and thereby refine the metal melt, and then taking out the refined metal melt from the arc melting furnace, followed by casting.
    Type: Application
    Filed: September 5, 2002
    Publication date: June 19, 2003
    Inventors: Hiroiti Sugimori, Chitoshi Matsumura, Satoaki Kawaguchi, Masanori Kato
  • Patent number: 6569222
    Abstract: Molybdenum trioxide or ammonium dimolybdate is reduced to molybdenum metal as it passes through an atmosphere of hydrogen in a multi-zoned thermally profiled rotating tube furnace.
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: May 27, 2003
    Assignee: Harper International Corporation
    Inventor: Edward V. McCormick
  • Patent number: 6409793
    Abstract: A method for processing steel slags and optionally iron carriers such as, e.g., electric furnace slags, converter slags, dusts derived from steel production, mill scale or secondary metallurgical residues, in which the molten steel slags or iron carriers are supplemented with chromium ores or chromium-containing and/or nickel-containing dusts in order to adjust a slag basicity of 1.2 to 1.6, whereby the bath temperature is maintained at above 1600° C., in particular between 1650° C. and 1800° C., and a carbon-containing iron bath is provided or formed. In addition to environmentally safe slags, a high-grade ferrochromium alloy may be recovered, thus enhancing the economy of the method.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: June 25, 2002
    Assignee: “Holderbank” Financiere Glarus AG
    Inventor: Alfred Edlinger
  • Publication number: 20010049981
    Abstract: Molybdenum trioxide or ammonium dimolybdate is reduced to molybdenum metal as it passes through an atmosphere of hydrogen in a multi-zoned thermally profiled rotating tube furnace.
    Type: Application
    Filed: May 29, 2001
    Publication date: December 13, 2001
    Inventor: Edward V. Mccormick
  • Patent number: 6251160
    Abstract: 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 in the slag to iron-III-oxide. The oxidized slag obtained solidifies and is disintegrated, whereupon the paramagnetic portions formed are magnetically isolated and separated from the dechromed slag.
    Type: Grant
    Filed: April 23, 1999
    Date of Patent: June 26, 2001
    Assignee: “Holderbank” Financiere Glarus AG
    Inventor: Alfred Edlinger
  • Patent number: 6245211
    Abstract: The present invention relates to a process for obtaining metals from oxides using shuttle alloys, particularly titanium metal from titanium dioxide in the form of illmenite rutile. The process can be adapted to obtain elemental metal or alloys of metals such as zirconium, chronium, molybdenum, tungsten, tantalum, lithium, cobalt and zinc. The process of the present invention comprises two stages, a first stage in which a metal oxide is reduced in the presence of primary shuttle material, which forms a shuttle alloy with the reduced metals, and a second stage wherein the reduced metal is separated from the shuttle alloy as a metal or alloy. Typically the primary shuttle material comprises bismuth or antimony or a mixture of the two and optionally lead. The reduction reaction may be carried out by chemical means or electrochemical means or by a combination of the two.
    Type: Grant
    Filed: June 21, 1999
    Date of Patent: June 12, 2001
    Inventor: Claude Fortin
  • Patent number: 6210461
    Abstract: 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, tungsten, and uranium. It also offers a process for growing particular shapes of metallic crystals, e.g., needlelike. This invention is intended to be less expensive to operate and to provide a superior product than from Kroll batch processing, as often used: For the continuous metal production, circulating molten salt supports two principal reaction stages, which together allow continuous metal production: Titanium powder production with one possible set of reactants may be used as an example for the group of metals listed: In Stage 1 a pumped solution of titanium ions (Ti++) dissolved in molten salt (e.g., MgCl2—KCl) flows onto, then down beside, molten magnesium that floats on molten salt below.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: April 3, 2001
    Inventor: Guy R. B. Elliott
  • Patent number: 6068677
    Abstract: The method for processing waste or waste fractions, such as, for example, household refuse, car shredder light fractions or the like, provides for pyrolysis, gasification and/or combustion, whereupon the residues are melted under reducing conditions. The reduced portions are then are subjected to a stepwise oxidation, with chromium being quantitatively separated in a first oxidation stage. After this, a calcium ferrite slag is formed by further oxidation, whereupon the remaining metal bath is further processed in order to recover nonferrous heavy metals.
    Type: Grant
    Filed: August 5, 1997
    Date of Patent: May 30, 2000
    Assignee: "Holderbank" Financiere Glarus AG
    Inventor: Alfred Edlinger
  • Patent number: 6039788
    Abstract: The present invention relates to a method of manufacturing high purity chromium suitable for deposition onto a semiconductor wafer or other substrate by sputtering. The process increases productivity, expands melting capability and provides consistent high purity chromium by reducing contamination by the dissolution of crucible material. The present invention provides for the addition of chromium oxide (Cr.sub.2 O.sub.3) to control oxygen content in chromium thereby producing high purity chromium ingots and protecting the ceramic crucibles from chemical attack by the liquid chromium.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: March 21, 2000
    Assignees: Sony Corporation, Materials Research Corporation
    Inventors: Raymond K. F. Lam, Charles E. Melin, Guiseppe Colella
  • Patent number: 6010553
    Abstract: In a process for producing pig iron, nonferrous heavy metal alloys, ferrochromium carbure or carbon-free ferrochromium and synthetic blast furnace slags, using metal-oxide-containing waste incineration residues or slags, the charging materials of waste burning, e.g., car shredder light fractions and/or metallurgical dusts, are at least partially oxidized and subsequently are reduced while separating nonferrous metals or alloys, whereupon the oxidic slag phase depleted from metals or alloys is mixed with liquid steelworks slag optionally upon further addition of metallurgical dusts, whereupon crude steel is drawn off while lowering the viscosity of the steelworks slag and the remaining slag portion is subjected to further reduction while recovering pig iron and optionally Fe chromium alloys, whereupon the resulting synthetic blast furnace slag is discharged.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: January 4, 2000
    Assignee: "Holderbank" Financiere Glarus AG
    Inventors: Alfred Edlinger, Albert Waschnig
  • Patent number: 6001148
    Abstract: A process for producing metals in the reduced state from their oxides using a simple and less expensive facility with lower running cost. A metal oxide in the form of particles is supplied into a high temperature flame from an oxygen burner in a reactor furnace to heat and melt the metal oxide. A reducing agent is also supplied into the flame to cause a reducing reaction of the molten metal oxide with the reducing agent. The resulting metal is recovered.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: December 14, 1999
    Assignee: Daido Steel Co., Ltd.
    Inventors: Tetsuo Okamoto, Hideharu Sakai
  • Patent number: 5985000
    Abstract: To provide a Cu-Cr alloy electrode material, a mixture of Cu and cr materials at a predetermined ratio is heated until the mixture has been entirely melted, and the molten metal obtained is quenched to precipitate fine Cr particles in a Cu base. Since Cr is melted into Cu before quenching, and then Cr precipitates, Cr particles finer than those in the sintering or infiltration method can disperse in a Cu base. This invention prevents defects such as voids in the structure and the weakening of the fusion of Cu and Cr or failure of Cr to precipitate into the Cu base caused by oxide films on the surface of the Cr particles, thereby providing a fine alloy structure.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: November 16, 1999
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Hisaji Shinohara, Katsuro Shiozaki, Kazuro Shibata, Masayuki Furusawa, Shunichi Hatakeyama, Hiromi Iwai, Tatsuo Take, Tsuneki Shinokura
  • Patent number: 5912399
    Abstract: A new tungsten compound is formed by reacting ammonium metatungstate with guanidine carbonate. Such a compound can be converted to metallic tungsten, tungsten carbide or oxycarbide, and tungsten nitride or oxynitride. One can also make multiphase composite particles based on molybdenum, tungsten or their compounds (such as carbide or nitride), and at least one other metallic phase, such as cobalt, copper, nickel, iron or silver. The process involves first dispersing particles of a refractory metal or its compounds in a liquid medium, followed by inducing a chemical reaction in the liquid phase to generate a new solid phase which coats or mixes with the dispersed particles. The solid phase includes elements required in the final composite. After removing the liquid phase, the remaining solid is converted by hydrogen reduction into the final products.
    Type: Grant
    Filed: November 14, 1996
    Date of Patent: June 15, 1999
    Assignee: Materials Modification Inc.
    Inventors: Chunzhe C. Yu, Reshma Kumar
  • Patent number: 5882375
    Abstract: 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 blast furnace slag, electric arc furnace slag, dusts from steel production, metallic waste substances or refuse incineration residues and/or with acid additives for lowering the viscosity, whereupon steel is sedimented out of the liquid slag and the remaining slag in a first reduction stage is reduced to metallic iron having an iron oxide content of below 5 wt. % and above 1 wt. %, whereupon the remaining slag melt in a second reduction stage having a higher reduction potential as compared to the first reduction stage is further reduced to metallic Cr or V or ferroalloys thereof and the hydraulically active slag is separated.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: March 16, 1999
    Assignee: "Holderbank" Financiere Glarus AG
    Inventors: Alfred Edlinger, Andreas Goessnitzer
  • Patent number: 5882377
    Abstract: In this invention, the smelting reduction operation can be carried out in a high efficiency by charging a carbonaceous material in such an amount that total surface area is not less than 60 m.sup.2 per 1 ton of slag weight. Carbon substance finely particulating through thermal crumbling under a high-temperature atmosphere inside the vessel is used as the carbonaceous material, whereby it is possible to stably conduct the smelting reduction while controlling the scattering of the carbonaceous material, and also the erosion, particularly locally erosion of refractory in the smelting reduction furnace, which was a serious problem in the conventional technique, can considerably be decreased to largely prolong the service life of refractory.
    Type: Grant
    Filed: March 5, 1997
    Date of Patent: March 16, 1999
    Assignee: Kawasaki Steel Corporation
    Inventors: Kimiharu Aida, Shuji Takeuchi, Nagayasu Bessho, Tomomichi Terabatake, Yasuo Kishimoto, Hiroshi Nishikawa, Fumio Sudo
  • Patent number: 5866067
    Abstract: The present invention relates to high purity chromium metal suitable for deposition onto a semiconductor wafer or other substrate by sputtering. The high purity chromium metal is produced by a process that increases productivity, expands melting capability and provides consistent high purity chromium by reducing contamination by the dissolution of crucible material. The present invention provides high purity chromium by the addition of chromium oxide (Cr.sub.2 O.sub.3) to molten chromium to control oxygen content in the chromium thereby producing high purity chromium ingots and protecting the ceramic crucibles from chemical attach by the liquid chromium.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: February 2, 1999
    Assignee: Sony Corporation and Materials Research Corporation
    Inventors: Raymond K. F. Lam, Charles E. Melin, Guiseppe Colella