Forming Compound Containing Plural Metals Patents (Class 423/61)
  • Patent number: 10369631
    Abstract: The present invention provides a method for recycling waste cemented carbide by molten salt chemistry, comprising the steps of: (1) carrying out vacuum dehydration on a molten salt media; (2) carrying out oxidation-dissolution reaction on waste cemented carbide in the molten salt media; (3) carrying out deoxidation treatment on a molten salt system; (4) carrying out thermal reduction reaction on the molten salt system; and (5) washing, filtering and vacuum drying obtained mixture by thermal reduction reaction to carry out separation and collection of the molten salt media and waste cemented carbide nanopowder. Compared with existing method for recycling waste cemented carbide, the invention has the advantages of short flow, simple equipment, low energy consumption, and excellent recycled products. Moreover, the invention doesn't produce solid/gas/liquid harmful substances to pollute the environment, and can create enormous economic and social benefits.
    Type: Grant
    Filed: January 5, 2017
    Date of Patent: August 6, 2019
    Inventor: Na Wang
  • Publication number: 20140112847
    Abstract: Provided are a method for producing sodium tungstate by supplying an oxidant made of sodium nitrate or sodium nitrite to bring a tungsten containing material and the oxidant into contact with each other in an atmosphere containing oxygen to thereby continuously produce a reaction product; a method for collecting tungsten using the method; and an apparatus for producing sodium tungstate. Also provided are a method for producing a sodium tungstate aqueous solution in which a reductant is introduced into a melt containing the above-described reaction product which is then dissolved in water; and a method for collecting tungsten using the method.
    Type: Application
    Filed: December 23, 2013
    Publication date: April 24, 2014
    Applicants: A.L.M.T. Corp., Sumitomo Electric Industries, Ltd., Sumitomo Electric Hardmetal Corp.
    Inventors: Yoshiharu Yamamoto, Kazuo Sasaya, Takayuki Fudo, Akira Nakano, Syunsuke Yamanaka, Takahisa Iguchi, Fumiatsu Sato, Akihiko Ikegaya
  • Publication number: 20110300040
    Abstract: Provided are a method for producing sodium tungstate by supplying an oxidant made of sodium nitrate or sodium nitrite to bring a tungsten containing material and the oxidant into contact with each other in an atmosphere containing oxygen to thereby continuously produce a reaction product; a method for collecting tungsten using the method; and an apparatus for producing sodium tungstate. Also provided are a method for producing a sodium tungstate aqueous solution in which a reductant is introduced into a melt containing the above-described reaction product which is then dissolved in water; and a method for collecting tungsten using the method.
    Type: Application
    Filed: March 5, 2010
    Publication date: December 8, 2011
    Applicants: A.L.M.T. CORP., SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Yoshiharu Yamamoto, Kazuo Sasaya, Takayuki Fudo, Akira Nakano, Syunsuke Yamanaka, Takahisa Iguchi, Fumiatsu Sato, Akihiko Ikegaya
  • Patent number: 7968066
    Abstract: This invention relates to a method for producing chromates, especially for producing alkali metal chromates. The method comprises following steps: the obtaining of a mixture of alkali metal hydroxide, alkali metal chromate, and ferrous residue after the reaction of chromite ore with an oxidant in the reactor in the presence of molten salt or in aqueous solution of alkali metal hydroxide, the obtaining of a leaching slurry by leaching the reaction products with aqueous solution of alkali metal hydroxide, the separating of the primary chromate product from the leaching slurry, the obtaining of pure chromate crystal by purifying the primary chromate product. Both the primary chromate product and the pure chromate crystal can be used as the raw materials to manufacture other chromium compounds. Compared with the currently-used roasting method, the method has the advantages of decreasing the reaction temperature by about 700° C.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: June 28, 2011
    Assignee: Institute of Process Engineering Chinese Academy of Sciences
    Inventors: Zuohu Li, Yi Zhang, Shili Zheng, Tao Qi, Huiquan Li, Hongbin Xu, Zhikuan Wang
  • Patent number: 7445763
    Abstract: A coating powder based on chemically modified titanium suboxides, for use in various coating techniques. Coatings produced from this powder are characterized by high electroconductivity, good solid lubricating properties and resistance to wear. For these reasons, there are numerous possibilities of use of components which were coated by suitable processes with this powder, especially as functional layers for fuel cells in electrochemical installations, in the new car industry, in mechanical engineering and in other economic activities. The coating powder based on titanium suboxides having a defined defect structure is characterized in that it is modified by at least one metallic alloying element and described by general formula: Tin-2Me2O2n-1.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: November 4, 2008
    Assignee: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung E. V.
    Inventors: Lutz-Michael Berger, Sven Thiele, Manfred Nebelung
  • Patent number: 7354565
    Abstract: The present invention discloses a relaxor material lead iron tungstate which has been synthesized in doped and undoped conditions by single and two step heat treatment. The relaxor material is seen to exhibit almost negligible hysteresis and a transducer made thereby shows pressure measurement capability over a wide range from 0.5 MPa to 415 MPa with accuracy of ±0.05%.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: April 8, 2008
    Assignees: Council of Scientific & Industrial Research, Indian Institute of Technology - Delhi
    Inventors: Kamlesh Kumar Jain, Vinay Kumar, Subhash Chand Kashyap
  • Patent number: 7261820
    Abstract: A method and system for decreasing the concentration of at least one metal in an aqueous solution. The metal may be molybdenum, tungsten, or both. An aqueous solution is introduced into at least one reaction zone, and at least one source of hydroxide ions is provided into the at least one reaction zone in an amount sufficient to precipitate at least some of the mass of the at least one metal. The aqueous solution includes a mass of the at least one metal and a mass of at least one reducing agent. The at least one reducing agent includes at least ferrous iron from at least one source of the at least one reducing agent. A composition of tungsten ferrite or molybdenum tungsten ferrite may be formed. The method may be used for purifying water, for the refining of metals, or to facilitate a chemical analytical determination.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: August 28, 2007
    Assignee: General Electric Company
    Inventors: Brian Charles Blakey, James Rulon Young Rawson, Bang Mo Kim, Angelo Anthony Bracco
  • Patent number: 7045112
    Abstract: Disclosed herein are compositions of a manganese sulfide (MnS) compound useful as additives for making a sintered product. Also disclosed herein is a method of making the composistions in which molybdenum (Mo) or Fe—Mo is added to the MnS compound to improve machinability and to obtain a more stable MnS compound, thereby reducing any change in weight and size in a sintering process. The compositions can suppress erosion of parts in a sintering furnace during a sintering process, prevent sooting on a surface of the sintered product from occurring, and enhance resistance to moisture in the air to keep the sintered product in the air for a long time.
    Type: Grant
    Filed: May 4, 2005
    Date of Patent: May 16, 2006
    Assignee: Kaya Ama Inc.
    Inventors: Dong Kyu Park, Hyung Bum Kim
  • Patent number: 6500779
    Abstract: This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V I VqMoAyOz II NiMoxByOz′ III VNiwMoxCy′Oz″ IV CoNiwMoxDyOz′″ V VNiwCorMoxEyOz″″ wherein: A is at least one cation selected from the group consisting of cations of: Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of: Sb, Al and W; C is at least one cation selected from the group consisting of cations of: Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of: Ba, Mn, Al, Sb, Sn, and W; E is at least one cation selected from the group consisting of cations of: Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x and y are each independently a number from 0.1 to 10 and y′ is a number from 0 to 10, z, z′, z″, z′″, and z″″ are determined using the amounts and oxidation states of all cations present in each formula.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: December 31, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Kostantinos Kourtakis, John Donal Sullivan
  • Patent number: 6395241
    Abstract: The process of the present invention relates to a process for recovering the carbide metal from metal carbide scrap wherein the metal is tungsten, titanium, vanadium, chromium or molybdenum, and this process comprises (A) providing a mixture comprising the metal carbide scrap and at least a stoichiometric amount, based on the amount of carbide metal present in the scrap, of an alkali metal hydroxide, (B) heating the mixture in the presence of oxygen at an elevated temperature and pressure for a period of time sufficient to form a water soluble alkali metal salt of the carbide metal, and (C) recovering the water soluble alkali metal salt.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: May 28, 2002
    Assignee: OM Group, Inc.
    Inventors: George P. Kinstle, Alex T. Magdics
  • Patent number: 6149883
    Abstract: Molybdenum trioxide is produced from molybdenite by a pressure oxidation process comprising of the steps of forming an aqueous slurry of molybdenite, pressure oxidizing the slurry to form soluble and insoluble molybdenum species, converting the insoluble molybdenum species to soluble molybdenum species by alkaline digestion, separating the soluble molybdenum species from insoluble residue contaminants (if present), removing the molybdenum species from the aqueous media through solvent extraction, and recovering the molybdenum values as molybdenum trioxide from the organic solvent. Low grade molybdenite concentrates, including concentrator slimes containing talc and sericite, can be used as a feed. The process produces technical grade molybdenum trioxide.
    Type: Grant
    Filed: October 24, 1994
    Date of Patent: November 21, 2000
    Assignee: Kennecott Utah Copper Corporation
    Inventors: Victor J. Ketcham, Enzo L. Coltrinari, Wayne W. Hazen
  • Patent number: 6103392
    Abstract: A high performance W--Cu composite powder is provided which is composed of individual particles having a tungsten phase and a copper phase wherein the tungsten phase substantially encapsulates the copper phase. The tungsten-coated copper composite powder may be pressed and sintered into W--Cu pseudoalloy articles having a homogeneous distribution of W and Cu phases without experiencing copper bleedout or it may be used in ceramic metallization for the electronics industry.
    Type: Grant
    Filed: November 17, 1995
    Date of Patent: August 15, 2000
    Assignee: Osram Sylvania Inc.
    Inventors: Leonid P. Dorfman, David L. Houck, Michael J. Scheithauer, Gail T. Meyers, Frank J. Venskytis
  • Patent number: 5993756
    Abstract: A method for the preparation of sodium tungstate by the oxidation of hard metal scrap and/or heavy metal scrap in a molten salt mixture of hydroxide and sodium sulfate.
    Type: Grant
    Filed: May 4, 1998
    Date of Patent: November 30, 1999
    Assignee: H.C. Starck, GmbH & Co. KG
    Inventor: Michael Lohse
  • Patent number: 5932184
    Abstract: A method for recovering tungsten from a tungsten containing spent catalyst comprises digesting the catalyst in aqueous sodium hydroxide solution wherein the mole ratio of the sodium hydroxide to the tungsten contained in the spent catalyst is from about 2.6 to about 4.2 and wherein the amount of water is sufficient to dissolve the subsequently produced sodium tungstate, at a temperature of at least about 90.degree. C. for a length of time of at least about 1 hour to convert greater than about 77% by weight of the tungsten contained in the spent catalyst to sodium tungstate and form a sodium tungstate solution thereof and a residue containing the balance of the starting tungsten, and separating the sodium tungstate solution from the residue. Essentially all of the tungsten is recovered as sodium tungstate by first grinding the catalyst prior to the digestion and by using a mole ratio of sodium hydroxide to tungsten of about 3.8 to 4.2.
    Type: Grant
    Filed: May 26, 1992
    Date of Patent: August 3, 1999
    Assignee: GTE Products Corporation
    Inventors: Michael J. Miller, Clarence D. Vanderpool
  • 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: 5882620
    Abstract: A process for forming a salt, such as sodium tungstate, using a pyrometallurgical operation is provided. A slagging operation is performed in which a metal-containing material is melted in the presence of slag formers such as sodium metasilicate and silica. The metal predominantly reports to a denser metal-containing phase. The denser metal-containing phase may then be subjected to gas sparging with a carbon-containing gas in order to form metal carbide, preferably tungsten carbide.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 16, 1999
    Assignee: International Carbitech Industries, Inc.
    Inventors: Jerome P. Downey, Peter W. Siewert
  • Patent number: 5874056
    Abstract: Phase-pure, crystalline tungstates of general composition Me(II)WO.sub.4, where Me(II)=Co, Ni, Zn, Pb, Mg, Ca, Sr and/or Ba. These are prepared by wet mixing tungsten components (preferably ammonium paratungstate or metatungstate) with corresponding sponding Me(II) oxides and used, preferably, in making perovskites and X-ray intensifier phosphors.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: February 23, 1999
    Assignee: H.C Starck GmbH & Co. KG
    Inventors: Walter Bludssus, Karlheinz Reichert, Udo Sulkowski
  • Patent number: 5819158
    Abstract: A simple, cost effective method for reclaiming tungsten values from tungsten-thoria has been invented. The method involves reacting the tungsten-thoria with molten sodium hydroxide to form a soluble sodium tungstate and an insoluble residue of thoria, cooling the melt, dissolving the melt in water, and filtering to separate the insoluble residue of thoria from the dissolved sodium tungstate. The method resulting in substantially all of the tungsten values being reclaimed as sodium tungstate and acutely reducing the amount of radioactive material for disposal.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: October 6, 1998
    Assignee: Osram Sylvania Inc.
    Inventors: Claraence D. Vanderpool, Thomas A. Wolfe, Michael J. Miller
  • Patent number: 5776264
    Abstract: Amorphous tungsten, cobalt, nickel, molybdenum, iron and alloys thereof can be formed by reducing metal-containing compositions to form the elemental metal wherein the particle size of the elemental metal is less than about 80 microns. This is oxidized in an oxygen-starved environment containing less than 3% oxygen and an inert gas to slowly oxidize the elemental metal. By oxidizing the metal under these conditions, the normal exotherm occurring during oxidation is avoided. The slow oxidation of the metal continues forming an amorphous metal oxide. The amorphous metal oxide can then be reacted in a reducing environment such as hydrogen to form the amorphous elemental metal. This amorphous elemental metal can then be reacted with a carburizing gas to form the carbide or ammonia gas to form the nitride or hexamethylsilane to form the silicide. This permits gas/solid reactions. The amorphous metal can also be used in a variety of different applications.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: July 7, 1998
    Assignee: Rutgers University
    Inventors: Larry E. McCandlish, Bernard Kear, Nicos C. Angastiniotis
  • Patent number: 5667759
    Abstract: A method for the decomposition of chromium ore in a directly heated revolving tube is described, in which oxygen-containing gases are introduced into the revolving tube by means of below-bed nozzles.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: September 16, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rainer Bellinghausen, Heinrich Helker, Paul Strehlow, Hans-Heinrich Moretto, Bernhard Spreckelmeyer, Norbert Lonhoff, Michael Batz, Rainer Weber, Hans Rinkes, Hans-Dieter Block, Uwe Arndt
  • Patent number: 5594929
    Abstract: According to the invention there is now provided a simple method of preparing a powder containing WC and cobalt and/or nickel. APT-powder and a powder of a basic salt of cobalt and/or cobalt are mixed in water or in mixed solvents. The suspension is stirred to react at temperatures ranging from room temperature to the boiling point of the solution whereby a precipitate is formed, which precipitate is filtered off, dried and finally reduced to a metallic powder.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: January 14, 1997
    Assignee: Sandvik AB
    Inventors: Mamoun Muhammed, Sverker Wahlberg, Ingmar Grenthe
  • Patent number: 5547646
    Abstract: A process for the decomposition of chrome ore by alkaline oxidation bymixing finely divided chrome ore with alkaline compounds,heating the mixture in an indirectly heated rotary kiln to between 800.degree. and 1,200.degree. C.,introducing oxygen or gases enriched with oxygen countercurrently to the mixture, whereinthe mixture of chrome ore and alkaline compound is divided into a large number of individual streams,each individual stream is fed into a separate indirectly heated rotary kiln,the large number of rotary kilns is combined in the form of a bank of kilns,the theoretical distance covered by the particles of the mixture through the rotary kiln is 5 to 30 m, andthe resulting average coverage of the inner surface of the rotary kiln is 1 to 5 kg of mixture/m.sup.2.
    Type: Grant
    Filed: January 24, 1995
    Date of Patent: August 20, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventor: R udiger Drope
  • Patent number: 5505918
    Abstract: A method for manufacturing alkali chromates by the reacting of chromium ore with alkali compounds and oxidation in an atmosphere containing at least 50% oxygen is described, in which the mixture consisting of chromium ore, alkali compound and optionally leaning materials is heated in a first stage in an atmosphere containing not more than 5 vol. % oxygen to a temperature between 1000.degree. and 1 400.degree. C., and in a second stage is oxidized at a lower temperature of 900.degree. to 1 070.degree. C. with supply of an atmosphere containing at least 50% oxygen.
    Type: Grant
    Filed: September 28, 1994
    Date of Patent: April 9, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Uwe Arndt, Michael Batz, Rainer Bellinghausen, Hans-Dieter Block, Heinrich Helker, Norbert Lonhoff, Hans-Heinrich Moretto, Hans-Georg Nieder-Vahrenholz, Hans Rinkes, Bernhard Spreckelmeyer, Rainer Weber
  • Patent number: 5503813
    Abstract: Epoxidate from the molybdenum catalyzed epoxidation of an olefin such as propylene with a hydroperoxide such as ethylbenzene hydroperoxide is treated with 2 to 15 times the stoichiometric equivalent of aqueous base such as sodium hydroxide to form Na.sub.2 MoO.sub.4 and the resulting mixture is phase separated to separate an organic phase reduced in molybdenum and a net aqueous stream containing removed molybdenum, the mass ratio of the organic phase to the net aqueous stream being 450-3,000/I.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: April 2, 1996
    Assignee: ARCO Chemical Technology, L.P.
    Inventor: Thomas I. Evans
  • Patent number: 5482690
    Abstract: The invention relates to a process for the low-waste production of sodium dichromate from the mineral chromite with simultaneous recovery of low-carbon ferrochromium.
    Type: Grant
    Filed: January 6, 1995
    Date of Patent: January 9, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventor: Karl-Christoph Scherhag
  • Patent number: 5470549
    Abstract: A method for making a tungsten-copper composite oxide wherein an amount of an ammonium tungstate and an amount of an oxide or hydroxide of copper are combined without milling to form a mixture. The unmilled mixture is then dehydrated and fired at a temperature and for a time sufficient to form the tungsten-copper composite oxide.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: November 28, 1995
    Assignee: Osram Sylvania Inc.
    Inventors: Leonid P. Dorfman, Michael J. Scheithauer, David L. Houck, Nelson E. Kopatz
  • Patent number: 5468457
    Abstract: A method of making a tungsten-copper composite oxide wherein an amount of an oxide of tungsten and an amount of an oxide of copper are combined to form a mixture, the oxide of tungsten or the oxide of copper, or both, being in a hydrated form. The mixture is then milled, dehydrated and fired at a temperature and for a time sufficient to form the tungsten-copper composite oxide, the time sufficient to form the tungsten-copper composite oxide being at least about one-half the time sufficient to form the tungsten-copper composite oxide from a mixture of tungsten trioxide, WO.sub.3, and cupric oxide, CuO, under substantially similar conditions.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: November 21, 1995
    Assignee: Osram Sylvania Inc.
    Inventors: Leonid P. Dorfman, Michael J. Scheithauer, David L. Houck, Nelson E. Kopatz
  • Patent number: 5374408
    Abstract: A process for the production of alkaline chromates by means of oxidative disaggregation in a reactor of substances containing trivalent chromium compounds in admixture with alkali. The oxidative disaggregation is carried out in dry phase by moving the mixture within the reactor while heating the mixture by indirect heat exchange in the absence of combustion gases and under mechanical stress, and feeding to the interior of the reactor oxidizing gas. The mixture is heated to a temperature of between 500.degree. and 1500.degree. C. The oxidizing gas is fed with an oxygen concentration in a range between 8 and 100%. Gases leaving the reactor are used for the acidification of an aqueous solution of alkaline chromates which is then dried and supplied to the reactor. The reactor is a rotating tubular reactor and the mixture moves continuously through the rotating reactor.
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: December 20, 1994
    Assignee: Luigi Stoppani S.P.A.
    Inventors: Giuseppe Bruzzone, Diego Perrone, Alfredo Parodi
  • Patent number: 5273726
    Abstract: Aluminum is removed from ammonium molybdate solution by the use of Mg.sup.+2 in the solution to precipitate out the aluminum.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: December 28, 1993
    Assignee: GTE Products Corporation
    Inventors: Michael J. Cheresnowsky, Michael J. Miller, Shirley S. Schaeffer
  • Patent number: 5273735
    Abstract: A process for the preparation of sodium dichromate and sodium dichromate solutions by alkaline oxidizing roasting of chromium ores, leaching resulting roast with water, adjustment of the pH to 7 to 9.5, removal of the insoluble constituents by filtration, a sodium monochromate solution containing 300 to 400 g/l of Na.sub.2 CrO.sub.4 being obtained, conversion of the monochromate ions of this solution into dichromate ions by addition of an acid and/or by electrolysis and/or by reaction with carbon dioxide under pressure and crystallization of sodium dichromate by concentration of this solution. The improvement wherein before the conversion into a sodium dichromate solution, the sodium monochromate solution is concentrated to contents of 700 to 1000 g/l of Na.sub.2 CrO.sub.4, the monochromatic ions, the solution is subsequently freed as far as possible from sodium sulphate by cooling to a temperature of below 0.degree. C.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: December 28, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rainer Weber, Bernd Rosenow, Hans-Dieter Block, Norbert Lonhoff
  • Patent number: 5256608
    Abstract: A powdered admixture of a boron, carbon, nitrogen or silicon derivative of a first metal is combined with a source of a second metal and, optionally, a source of a third metal or an iron-group metal, subjected to densification conditions (heat and pressure), partially reacted and converted to a hard, wear resistant material. The wear resistant material contains an amount of the first metal derivative as well as a material of varying stoichiometry which is the partial reaction product of components of the powdered admixture. The material may also contain residual, unreacted portions of components other than the first metal derivative. Articles formed from this material can be useful as, for example, nozzles in abrasive or nonabrasive waterjet cutting machines and various parts of wire drawing apparatus.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: October 26, 1993
    Assignee: The Dow Chemical Company
    Inventors: Ellen M. Dubensky, Edward E. Timm, Ann M. McCombs, Julie L. Board
  • Patent number: 5250274
    Abstract: The invention relates to a process for the production of sodium dichromate and sodium dichromate solutions by oxidative roasting of chrome ores under alkaline conditions, leaching of the furnace clinker obtained with water or an aqueous chromate-containing solution, adjustment of the pH to from 7 to 9.5, removal of the insoluble constituents by filtration, a sodium monochromate solution being obtained, conversion of the monochromate ions of this solution into dichromate ions by acidification and crystallization of sodium dichromate by concentration of this solution, characterized in that the acidification is carried out with carbon dioxide under pressure with removal of sodium hydrogen carbonate, the remaining solution is then very largely freed from sodium monochromate by cooling to a temperature below 10.degree. C.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: October 5, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Norbert Lonhoff, Bernhard Spreckelmeyer, Hans-Dieter Block, Rainer Weber, Jost Halstenberg, Bernd Rosenow
  • Patent number: 5223460
    Abstract: A powdered admixture of a boron, carbon, nitrogen or silicon derivative of a first metal is combined with a source of a second metal and, optionally, a source of a third metal or an iron-group metal, subjected to densification conditions (heat and pressure), partially reacted and converted to a hard, wear resistant material. The wear resistant material contains an amount of the first metal derivative as well as a material of varying stoichiometry which is the partial reaction product of components of the powdered admixture. The material may also contain residual, unreacted portions of components other than the first metal derivative. Articles formed from this material can be useful as, for example, nozzles in abrasive or nonabrasive waterjet cutting machines and various parts of wire drawing apparatus.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: June 29, 1993
    Assignee: The Dow Chemical Company
    Inventors: Ellen M. Dubensky, Edward E. Timm, Ann M. McCombs, Julie L. Board
  • Patent number: 5215945
    Abstract: A powdered admixture of a boron, carbon, nitrogen or silicon derivative of a first metal is combined with a source of a second metal and, optionally, a source of a third metal or an iron-group metal, subjected to densification conditions (heat and pressure), partially reacted and converted to a hard, wear resistant material. The wear resistant material contains an amount of the first metal derivative as well as a material of varying stoichiometry which is the partial reaction product of components of the powdered admixture The material may also contain residual, unreacted portions of components other than the first metal derivative. Articles formed from this material can be useful as, for example, nozzles in abrasive or nonabrasive waterjet cutting machines and various parts of wire drawing apparatus.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: June 1, 1993
    Assignee: The Dow Chemical Company
    Inventors: Ellen M. Dubensky, Edward E. Timm, Ann M. McCombs, Julie L. Board
  • Patent number: 5082637
    Abstract: Potassium impurity is removed from ammonium molybdate by dissolving the ammonium molybdate in hot acid, allowing the acid solution to cool whereby the ammonium molybdate precipitates out of the solution as molybdenum trioxide and then separating, washing and drying the molybdenum trioxide.
    Type: Grant
    Filed: November 2, 1990
    Date of Patent: January 21, 1992
    Assignee: GTE Products Corporation
    Inventors: Michael J. Cheresnowsky, Timothy J. Hoffman
  • Patent number: 4917871
    Abstract: Methods of making Chevrel-phase materials suitable for use as battery cathodes by heating a precursor composition comprising one or more heat labile compounds of one or more non-molybdenum metals capable of forming a Chevrel-phase material, forming a reaction mixture with molybdenum and a chalcogen or compounds thereof, and further heating said reaction mixture. Chevrel-phase materials having two non-molybdenum metals in which one serves as a filler metal resistant to intecalation. Electrochemical cells incorporating the Chevrel-phase materials disclosed.
    Type: Grant
    Filed: August 1, 1988
    Date of Patent: April 17, 1990
    Assignee: Moli Energy Limited
    Inventors: Jeffrey R. Dahn, Harith J. Al-Janaby
  • Patent number: 4695447
    Abstract: Hazardous waste containing inorganic compounds which contain heavy metals or particular hazardous anionic groups or which are hazardous halides or non-metal oxides or sulfides is contacted with molten aluminum to provide reduction to lower less hazardous oxidation state.
    Type: Grant
    Filed: December 17, 1985
    Date of Patent: September 22, 1987
    Assignee: Detox International Corporation
    Inventor: Clifford G. Shultz
  • Patent number: 4643884
    Abstract: A process is disclosed for removing potassium from relatively impure molybdenum trioxide. The process involves contacting the impure molybdenum trioxide containing greater than about 600 weight parts potassium per million with a first acid leach which consists essentially of nitric acid and ammonium nitrate at a temperature of at least about 50.degree. C. for a sufficient time and at above a 2 molar concentration of said nitric acid and an ammonium nitrate concentration of from about 1.5 to about 2 molar in said first acid leach to solubilize the major portion of the potassium and form a once leached molybdenum trioxide containing the remaining portion of the potassium which is separated from the resulting potassium containing acid leach and contacted with a second leach solution substantially similar to the first acid leach followed by separating the resulting twice leached molybdenum trioxide from the resulting potassium containing second leach.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: February 17, 1987
    Assignee: GTE Products Corporaton
    Inventors: Michael J. Cheresnowsky, Timothy A. Brunelli, Robin W. Munn
  • Patent number: 4629606
    Abstract: The present invention provides a process for recovering a tungsten compound from a waste liquor containing a high-boiling organic compound and the tungsten compound, which process comprises the steps of spray-burning said waste liquor at an air ratio of 1.05 or higher under conditions of a temperature and a residence time which lie within the region of a pentagon defined by points A, B, C, D, and E in FIG. 1; quenching the combustion product by immediately bringing it into direct contact with water; and recovering the tungsten compound.
    Type: Grant
    Filed: July 16, 1985
    Date of Patent: December 16, 1986
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yoshiyuki Imagire, Teruhiko Hirabayashi, Nobuo Nonaka, Toshifumi Kitagawa, Yasukazu Murakami, Iwao Abe, Shinzo Uda, Osamu Ohshima, Etsuo Takemoto
  • Patent number: 4629503
    Abstract: The present invention relates to a simple process for the recovery of pure tungsten at a high yield from cemented tungsten carbide or tungsten alloys scrap. According to the invention the process consists of a series of steps characterized by certain critical parameters.
    Type: Grant
    Filed: April 17, 1985
    Date of Patent: December 16, 1986
    Assignee: RAMOT - University Authority for Applied Research and Industrial Development
    Inventors: Moshe Fruchter, Anutza Moscovici
  • Patent number: 4604267
    Abstract: Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of nitric acid, ammonium sulfate, and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major portion of the impurities. The resulting molybdenum concentrate is digested in ammonium hydroxide under conditions that maximize iron precipitation and removal. The resulting ammonium molybdate solution is separated from the sludge and further purified by chelating cation exchange resin in the ammonium form.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: August 5, 1986
    Assignee: GTE Products Corporation
    Inventor: Michael J. Cheresnowsky
  • Patent number: 4604266
    Abstract: Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of nitric acid and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major portion of the impurities. The resulting molybdenum concentrate is digested in ammonium hydroxide under conditions that maximize iron precipitation and removal. The resulting ammonium molybdate solution is separated from the sludge and further purified by chelating cation exchange resin in the ammonium form.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: August 5, 1986
    Assignee: GTE Products Corporation
    Inventors: Michael J. Cheresnowsky, Timothy A. Brunelli, Robin W. Munn, Tai K. Kim
  • Patent number: 4603043
    Abstract: A process for converting tungsten bearing material to sodium tungstate by adding an oxidizing reactant in small increments to a heated mixture of fused sodium hydroxide and the tungsten bearing material while the temperature is maintained at from about 500.degree. C. to about 700.degree. C.
    Type: Grant
    Filed: March 1, 1985
    Date of Patent: July 29, 1986
    Assignee: GTE Products Corporation
    Inventors: Alan D. Douglas, Kenneth T. Reilly, John E. Landmesser
  • Patent number: 4601890
    Abstract: Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of hydrochloric acid and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major portion of the impurities. The resulting molybdenum concentrate is digested in ammonium hydroxide under conditions that maximize iron precipitation and removal. The resulting ammonium molybdate solution is separated from the sludge and further purified by chelating cation exchange resin in the ammonium form.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: July 22, 1986
    Assignee: GTE Products Corporation
    Inventor: Michael J. Cheresnowsky
  • Patent number: 4599224
    Abstract: A process is disclosed for recovering molybdenum from molybdenum disulfide. The process involves forming a slurry of the molybdenum disulfide in a solution of an alkali metal hydroxide, the amount of hydroxide being sufficient to react with at least a portion of the molybdenum disulfide to form an alkali metal molybdate and an alkali sulfate, heating the slurry in an oxidizing atmosphere at an elevated temperature and pressure and for a sufficient time to effect the conversion to the molybdate, and separating the pregnant liquor containing the molybdate from any residue. To the pregnant liquor is then added a sufficient amount of a hexamine to form a hexamine-molybdenum compound containing the major portion of the molybdenum, followed by adjusting the pH to from about 1.5 to about 3.8 to precipitate the major portion of the hexamine-molybdenum compound, and separating the compound from the resulting mother liquor.
    Type: Grant
    Filed: August 22, 1985
    Date of Patent: July 8, 1986
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Martin B. MacInnis
  • Patent number: 4596701
    Abstract: Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of sulfuric acid, ammonium sulfate, and ammonium persulfate is contacted with impure molybdenum concentrate to solubilize a major portion of the impurities. The resulting molybdenum concentrate is digested in ammonium hydroxide under conditions that maximize iron precipitation and removal. The resulting ammonium molybdate solution is separated from the sludge and further purified by chelating cation exchange resin in the ammonium form.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: June 24, 1986
    Assignee: GTE Products Corporation
    Inventors: Michael J. Cheresnowsky, Brice E. Martin
  • Patent number: 4560539
    Abstract: A process is disclosed for removing ammonia from a sodium tungstate solution. The process involves heating the solution at from about 80.degree. C. to about 95.degree. C., while at the same time maintaining the pH above about 9.4 by addition of sodium hydroxide to the sodium tungstate solution. The heating is carried out for a period of time sufficient to allow the essentially complete removal of the ammonia.
    Type: Grant
    Filed: January 11, 1985
    Date of Patent: December 24, 1985
    Assignee: GTE Products Corporation
    Inventors: Tai K. Kim, Robin W. Munn, Carl W. Boyer, Martin C. Vogt
  • Patent number: 4555386
    Abstract: Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of nitric acid, ammmonium sulfate, and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major portion of the impurities. The resulting molybdenum concentrate is digested in ammonium hydroxide under conditions that maximize iron precipitation and removal. The resulting ammonium molybdate solution is separated from the sludge and further purified by chelating cation exchange resin in the ammonium form.
    Type: Grant
    Filed: February 29, 1984
    Date of Patent: November 26, 1985
    Assignee: GTE Products Corporation
    Inventor: Michael J. Cheresnowsky
  • Patent number: 4555294
    Abstract: An inorganic composition adapted for use in bonding a high temperature resistant polymeric material to an aluminum base substrate is provided. The composition is obtained by reacting a first inorganic compound containing chromium and oxygen with a second inorganic compound containing at least one element selected from the group consisting essentially of calcium, barium and strontium to form a reaction product containing chromium, oxygen and at least one element selected from the group essentially consisting of calcium, barium and strontium. A method of bonding a high temperature resistant polymeric material to an aluminum base substrate using the above composition is also provided.
    Type: Grant
    Filed: April 3, 1984
    Date of Patent: November 26, 1985
    Assignee: Imperial Clevite Inc.
    Inventors: Kenneth J. Adams, David E. Dyke
  • Patent number: 4548700
    Abstract: A slurry hydroconversion process is provided in which a carbonaceous chargestock such as a hydrocarbonaceous oil or coal comprising a catalyst containing vanadium or molybdenum or mixtures thereof, is converted to a hydroconverted oil product. A heavy oil portion comprising metal-containing solids is separated from the oil product and partially gasified to produce a carbon-free metal-containing ash which is extracted with oxalic acid. The resulting metal-containing oxalic acid extract is recycled to the hydroconversion zone as catalyst precursor.
    Type: Grant
    Filed: December 14, 1983
    Date of Patent: October 22, 1985
    Assignee: Exxon Research and Engineering Co.
    Inventors: Roby Bearden, Jr., Clyde L. Aldridge