Patents Examined by M. J. Andrews
  • Patent number: 4508322
    Abstract: A hermetically closable and evacuable apparatus for preparing high melting point high toughness metals by reduction of a chloride of said metals comprising a heatable reaction chamber and a coolable condensation chamber provided above the reaction chamber which chambers communicate with each other through an intermediate connecting section, wherein the intermediate connecting section is provided with a seal pot closing means comprising a funnel body and a pan which can be opened to form a wide gas passage, is disclosed.
    Type: Grant
    Filed: February 16, 1984
    Date of Patent: April 2, 1985
    Assignee: Mitsubishi Kinzoku Kabushiki Kaisha
    Inventors: Etsuji Kimura, Katsumi Ogi, Kazusuke Sato
  • Patent number: 4508323
    Abstract: A metallurgical molten-metal runner has a support trough, a trough-shaped temperature-equalizing layer received in and lining the trough, a system for cooling the layer isothermally to about 100.degree. C., a permanent refractory outer lining received in and lining the layer, and a renewable refractory inner lining received in and lining the outer lining and in direct contact with molten metal in the runner. The layer is of greater thermal conductivity than the linings. The cooling system includes conduits in heat-conducting engagement with the layer and an arrangement for circulating a coolant through the conduits. Water or, for safety's sake, oil can be used as the coolant, normally in liquid state to keep the layer below 100.degree. C. The layer according to this invention has a coefficient of thermal conductivity greater than 10 Kcal/M.multidot..degree.C..multidot.h, preferably above 25 Kcal/m.multidot..degree.C..multidot.h and can be composed principally of silicon carbide, semigraphite, or graphite.
    Type: Grant
    Filed: March 23, 1983
    Date of Patent: April 2, 1985
    Assignee: ARBED S.A.
    Inventor: Georges Fleming
  • Patent number: 4508566
    Abstract: A gas mixture obtained from reduction of material containing zinc oxide in a furnace, is cleaned from accompanying vapor of metals or compounds having a boiling point higher than zinc and from accompanying dust particles by cooling the hot gas mixture to almost the saturation temperature of zinc vapor by the introduction therein of solid or liquid metal.
    Type: Grant
    Filed: January 24, 1983
    Date of Patent: April 2, 1985
    Assignee: SKF Steel Engineering Aktiebolag
    Inventors: Sune Eriksson, Sven Santen, Gotthard Bjorling
  • Patent number: 4508565
    Abstract: The invention relates to a method for producing lead having a sulphur content beneath about 2%, from sulphur-containing oxidic lead raw materials contaminated with zinc and/or other readily oxidized elements, by smelting the materials in a furnace in which the furnace contents can be agitated. When practicing the method, the lead raw materials are charged to the furnace together with iron-containing fluxes and solid reduction agents. The charged materials are heated under agitation, to form a lead phase and a slag phase. The amount of reduction agent charged is selected so that at least all the lead contained in the furnace is reduced to lead metal and the amount and composition of the fluxes are selected so that a terminal slag is obtained in which the sum of the iron and zinc present is 30-40%, and so that the slag has a content of 15-25% of both SiO.sub.2 and CaO+MgO.
    Type: Grant
    Filed: April 30, 1984
    Date of Patent: April 2, 1985
    Assignee: Boliden Aktiebolag
    Inventors: Johan S. Leirnes, Malkolm S. Lundstrom, Martin L. Hedlund, Kurt J. A. Buren
  • Patent number: 4507150
    Abstract: Ti and V impurities are removed from molten aluminium by adding a boron-bearing substance and agitating the aluminium in the presence of a dispersed chloride and/or fluoride flux active for fluxing (Ti,V)B.sub.2 particles. It is preferred to perform the process by stirring the molten aluminium to generate a vortex, into which aluminium fluoride is introduced as a fluxing agent and for reaction with any alkali metal impurity present in the molten metal. The alkali metal fluoaluminate thus generated assists the fluxing of the (Ti,V)B.sub.2, as does any cell electrolyte present in the molten aluminium.
    Type: Grant
    Filed: November 10, 1983
    Date of Patent: March 26, 1985
    Assignee: Alcan International Limited
    Inventor: Ghyslain Dube
  • Patent number: 4504043
    Abstract: In a melting/gasifying furnace including a coke-filled layer, coal is gasified by oxygen blown through tuyeres into a hot reducing gas which is caused to ascend through the coke-filled layer so as to melt reduced iron supported on the top of the coke-filled layer. The resulting molten iron flows down through the coke-filled layer, and is collected in the lowermost region of the coke-filled layer and discharged therefrom, while the hot gas is recovered. The thus recovered gas is fed into a shaft reduction furnace to reduce iron ores, and the thus formed reduced iron is supplied into the melting/gasifying furnace. In addition to the coal, a variety of fuels mainly comprising carbon and hydrogen such as heavy oil, natural gas, etc. are used for gasification. The fuel is blown through the tuyeres and/or charged through middle openings disposed above the tuyeres.
    Type: Grant
    Filed: May 24, 1983
    Date of Patent: March 12, 1985
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Hideyuki Yamaoka, Michiharu Hatano, Tomio Miyazaki, Teruhisa Shimoda, Koji Oki
  • Patent number: 4504310
    Abstract: A process for the production of high purity metals or metallic alloys comprises the steps of:(a) producing a metal or metallic alloy, the non-metallic inclusions of which are, preferably, easily reducible oxides of the base metal;(b) milling the metal or metallic alloy thus obtained and agglomerating the milled metal or metallic alloy with an agglomerating agent and a reducing agent, so as to form balls; and(c) subjecting the balls to a reducing treatment under regulated conditions of reduced pressure and elevated temperature, at which the reducing agent acts on the non-metallic inclusions while substantial sublimation of the alloying metal or metals is avoided.The invention is particularly applicable to the production of high purity chromium.
    Type: Grant
    Filed: August 5, 1983
    Date of Patent: March 12, 1985
    Assignee: C. Delachaux
    Inventor: Laurent L. Boulier
  • Patent number: 4502670
    Abstract: The invention provides an apparatus for selectively connecting a gas supply to a vessel employed to contain molten metal. Generally stated, the apparatus includes a sealer plate connected to an external portion of the vessel to receive the gas and direct it into a fluid conduit that is in fluid communication with a selected interior portion of the vessel. A seal holder disposed in approximate alignment with the sealer plate receives the gas from the gas supply and directs it toward the sealer plate. A spacing mechanism interposed between the seal holder and the sealer plate maintains a selected spaced distance therebetween and delimits the side walls of a substantially sealed gas conduit chamber when the sealer plate and the seal holder simultaneously contact opposite end portions of the side walls defined by the spacing means. The conduit chamber is thereby configured to conduct the gas directed from the seal holder toward and into the sealer plate.
    Type: Grant
    Filed: February 2, 1984
    Date of Patent: March 5, 1985
    Assignee: Allied Corporation
    Inventors: Gunther R. Goebel, Richard G. Hall
  • Patent number: 4501614
    Abstract: An improved flux used for the recovery of metallic aluminum from dross in a reverberatory furnace. The flux is an alloyed mixture of sodium chloride and potassium chloride in approximately equal parts by weight which has been preheated and then cooled to form an alloyed mixture. A small amount of cryolite can be added to the liquid mixture before cooling to improve the recovery of metal obtained than when the salt and potash flux mixture is used alone.
    Type: Grant
    Filed: August 26, 1983
    Date of Patent: February 26, 1985
    Assignee: American Can Company
    Inventors: Carl F. Bauer, James H. Hussey, Benny Langston, Niranjan M. Parikh
  • Patent number: 4498927
    Abstract: Magnesium is produced by a thermal reduction process in a reaction-condensation system having a reaction zone and a condensation zone. According to this process, a reducing agent containing a mixture of ferrosilicon and at least 25 wt. % aluminum skim is contacted or reacted in the reaction zone with a calcium-silicon-aluminum-magnesium oxide slag to produce magnesium vapor. The magnesium vapor is transported from the reaction zone to the condensation zone and condensed therein.
    Type: Grant
    Filed: March 10, 1983
    Date of Patent: February 12, 1985
    Assignee: Aluminum Company of America
    Inventors: Kenneth A. Bowman, Roy A. Christini, Marlyn D. Ballain
  • Patent number: 4498523
    Abstract: A continuous process is disclosed for the recovery of an aluminum alloy from aluminum scrap containing more than one alloy. The recovery is made in a manner which will conserve energy. The process comprises providing a feedstock containing at least two components therein comprised of different aluminum alloys, the components having at least parts thereof joined to each other. The feedstock is treated to cause the joined components to become detached from each other. One of the detached components is separated from the remainder of the feedstock, melted and thereafter continuously cast without substantially upgrading the composition thereof to provide a cast alloy having a composition substantially the same as that from which the separated component was fabricated. The treating may be accomplished by heating the feedstock to a temperature sufficiently high to render fracture sensitive the component having the lowest incipient melting temperature.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: February 12, 1985
    Assignee: Aluminum Company of America
    Inventors: Kenneth A. Bowman, Marvin E. Gantz, Jr.
  • Patent number: 4497658
    Abstract: A highly compact and efficient tilting crucible furnace and smelting method is disclosed for use in the direct smelting of a precious metal containing material. A furnace body having a refractory lined cavity which has a top opening is pivotally mounted on a support frame to allow tipping thereof. A cover having a first opening to receive a gas burner and a second multi-purpose opening therein is rigidly attached to the body. A gas burner attached to the cover provides a downwardly directed oxidizing flame into the cavity to oxidize iron which is added to the cavity and other impurities in the precious metal containing material. A flux is provided to provide a thoroughly liquid mixture and after heating, the molten mass is poured through the multi-purpose cover opening into a mold. As the mold cools, a dore button of precious metal settles to the bottom of the mold and slag containing impurities forms on the top.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: February 5, 1985
    Inventor: Manfred J. Woog
  • Patent number: 4496394
    Abstract: The invention relates to a continuous method of removing tin from lead. The method comprises maintaining a pool of molten lead at a temperature of from 510.degree. C. to 570.degree. C., introducing molten lead into the pool, injecting chlorine and oxygen into the molten lead in an amount to react with tin present as an impurity in the lead to form a tin-containing dross and then separating the lead from the dross.Separation may either be performed in the reaction vessel itself or in a separate settlement vessel.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: January 29, 1985
    Assignee: BNF Metals Technology Centre
    Inventor: John E. Bowers
  • Patent number: 4494985
    Abstract: The invention provides a filter apparatus and method for removing inclusions from a molten metal alloy and includes a container having an inlet portion and an outlet portion. A filter bed is located within said container, interposed between said container inlet and said container outlet, and is comprised of a plurality of filter zones arranged in progressive layers. Each of the filter zones contains particles of filter material within a preselected size range, and the filter zones are successively arranged to selectively locate the largest filter particles at the container outlet and the smallest filter particles at the container inlet. Molten metal alloy is filtered by passing it through the filter bed.
    Type: Grant
    Filed: January 7, 1983
    Date of Patent: January 22, 1985
    Assignee: Allied Corporation
    Inventors: Russell H. Butler, Edward V. Limoncelli, Michael J. Litwinowich, Michael L. Briggs
  • Patent number: 4494735
    Abstract: A gas injection nozzle design for use in a swirling tank reactor used in the degassing of molten metal with a fluxing gas. The nozzle design eliminates metal leakage from the reactor around the nozzle tip and gas leakage within the fluxing gas delivery line. The nozzle tip is provided with an orifice profile consisting of a straight hole opening of constant diameter or consisting of a converging-diverging profile.
    Type: Grant
    Filed: November 16, 1983
    Date of Patent: January 22, 1985
    Assignee: Swiss Aluminium Ltd.
    Inventor: Robert E. Hershey
  • Patent number: 4495009
    Abstract: A method of cooling band or hoop steels with hollow cooling rolls through which a cooling medium flows to absorb the heat of the steel strips trained about and in contact with the hollow cooling rolls, thereby cooling the steel strips. According to the invention this method is carried out so as to fulfil the following equation (1) with the cooling roll having a diameter D>600 mm when a thickness h of the steel strip is within 0.2.ltoreq.h<0.6 mm,.DELTA.T.sub.S <0.65.multidot..sigma..sub.T.sup.1.5 .multidot..theta..multidot.h.sup.-0.75 (1)and so as to fulfil the following equation (2) with the cooling roll having a diameter D>1,000 mm when a thickness h of the steel strip is within 0.6 mm.ltoreq.h,.DELTA.T.sub.S <1.05.multidot..sigma..sub.T.sup.1.5 .multidot..theta..multidot.h.sup.-0.83 (2)where .DELTA.T.sub.S is temperature fall .degree.C. per one cooling roll, .sigma..sub.T is tensile stress in a lengthwise direction of the steel strip and .theta. is winding angle about the cooling roll.
    Type: Grant
    Filed: July 6, 1983
    Date of Patent: January 22, 1985
    Assignees: Kawasaki Steel Corporation, Mitsubishi Heavy Industries, Ltd.
    Inventors: Shinjiro Murakami, Osamu Hashimoto, Kazuo Morimoto, Kaneaki Hyodo
  • Patent number: 4494988
    Abstract: A chromium-nickel-silicon-manganese steel alloy consisting essentially of about 1.0% maximum carbon, from 10% to about 16% manganese, about 0.07% maximum phosphorus, about 0.1% maximum sulfur, 4% to 6% silicon, 4% to 6% chromium, 4% to about 6% nickel, about 0.05% maximum nitrogen, and balance essentially iron. Preferred embodiments exhibit excellent galling resistance, metal-to-metal wear resistance, high impact strength, oxidation resistance and corrosion resistance.
    Type: Grant
    Filed: December 19, 1983
    Date of Patent: January 22, 1985
    Assignee: Armco Inc.
    Inventors: William J. Schumacher, Harry Tanczyn
  • Patent number: 4494984
    Abstract: A method of reducing iron oxide by induction heating.
    Type: Grant
    Filed: July 7, 1980
    Date of Patent: January 22, 1985
    Inventor: Albert Calderon
  • Patent number: 4495001
    Abstract: In the thermal ageing of extruded sections of age-hardenable aluminum alloys the sections are progressed through a system having an initial low temperature zone and a subsequent high temperature zone. In order to secure uniform ageing the sections are progressed in a direction transverse to their length and conveniently are arranged in a single layer and spaced apart to ensure acceptably uniform rate of heating to ageing temperature.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: January 22, 1985
    Assignee: Alcan International Limited
    Inventors: Walter Bennett, John H. Ablewhite, Anthony J. Bryant
  • Patent number: 4494737
    Abstract: A water-cooled lance is supported above the mouth of a steel-making vessel for vertical reciprocating movement and includes a slurry pipe which is rotatably positioned to spray repair material against the inner lining of the vessel, or to place a new lining on the interior of the vessel.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: January 22, 1985
    Assignee: Pullman Berry Company
    Inventors: Nicholas M. Rymarchyk, Jr., Leo L. Meinert