Group Vib Metal (cr, Mo, Or W) Patents (Class 423/53)
  • Patent number: 5073645
    Abstract: The present invention is directed to tungsten halogen phosphine complex compounds having the formula W(PX.sub.3).sub.6-n L.sub.n wherein X is fluorine or chlorine, L is molecular nitrogen, acetone or other ketones or aldehydes, carbon monoxide, acetonitrile or other nitriles, diphenylethine or other ethines, diethylether or tetrahydrofurane or other open-chained or cyclic ethers, benzene or other aromatics, ethene or 1,5-cyclooctodiene or cycloheptatriene or other mono, di, or, respectively, triolefines, whereby two single-tooth ligands L can be replaced by one .mu..sup.4 -ligand or three single-tooth ligands L can be replaced by one .mu..sup.6 -ligand and n is a whole number from 0 to 5, as well as methods for the manufacture thereof. These substances are easily volatile in a vacuum and can be decomposed at extremely low temperatures and are therefore extremely well suited for CVD depositions in semiconductor technology, particularly, as via hole fillers in VLSI circuits.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: December 17, 1991
    Assignee: Siemens Aktiengesellschaft
    Inventors: Thomas Kruck, Norbert Behrendorf, Heiko Faubel
  • Patent number: 5066469
    Abstract: A process is disclosed to extract cobalt and optionally, at least one metal value selected from the group consisting of molybdenum, nickel, tungsten, and vanadium from metal-containing particles, such as spent hydroprocessing catalysts particles containing carbon residue. In this process, the spent catalyst particles are roasted in an oxygen-containing gas at a temperature of from 400.degree. C. to 600.degree. C., and then the roasted catalyst particles are contacted with an aqueous solution of ammonia, ammonium salt, and hydrogen peroxide. The aqueous solution has an initial pH of at least 9.5 and an initial hydrogen peroxide concentration of from 0.02 to 0.2 M. That aqueous solution is maintained at a pH of greater than 9.5.
    Type: Grant
    Filed: March 9, 1990
    Date of Patent: November 19, 1991
    Assignee: Chevron Research and Technology Co.
    Inventor: Paul J. Marcantonio
  • Patent number: 5034211
    Abstract: Disclosed is a method of reducing the turbidity of an aqueous solution of chromic acid which is formed by dissolving melted chromic anhydride in water. The chromic anhydride is contacted with water in an amount in excess of 0.02 wt %, but insufficient to form a solution, at a temperature above ambient but below about 196.degree. C. The water may be in the form of a liquid, water vapor, or steam. When the chromic anhydride is subsequently dissolved in water, the solution is much less turbid than it otherwise would be.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: July 23, 1991
    Assignee: Occidental Chemical Corporation
    Inventors: Robert L. Zeller, III, Russell J. Morgan, Gilbert D. Rabbe, Donna R. Fiscus, Richard L. Wilkes, Jr.
  • Patent number: 5032377
    Abstract: Chromium oxide green in the form of donut-shaped, ring-shaped or tire-shaped particles having an internal diameter of from 0.01 to 0.5 mm and an external diameter of from 0.05 to 1.0 mm is prepared by spraying an aqueous chromium oxide green suspension through a liquid pressure nozzle into a spray dryer such that the suspension entering the drying space of the spray dryer is rotating.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: July 16, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jakob Rademachers, Hans-Ulrich Hofs
  • Patent number: 5021133
    Abstract: A method is disclosed for producing ammonium paratungstate from cemented tungsten carbide which comprises subjecting the cemented tungsten carbide to electrolysis by passing about 0.5 to about 20 volts through an ammoniacal solution selected from the group consisting of ammonium hydroxide-ammonium chloride solution, ammonium hydroxide-ammonium carbonate solution, and ammonium hydroxide-ammonium sulfate solution, wherein platinum and the cemented tungsten carbide serve as the anode and wherein the anode is immersed in the solution, to decompose the cemented tungsten carbide and form a solution of ammonium tungstate from which is crystallized ammonium paratungstate.
    Type: Grant
    Filed: April 4, 1990
    Date of Patent: June 4, 1991
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Tai K. Kim
  • Patent number: 4996108
    Abstract: Compositions of the formula MX.sub.2 :Y, wherein MX.sub.2 is a layer type transition metal dichalcogenide, M is a metal selected from the group consisting of niobium, tantalum, molybdenum and tungsten, X is a chalcogen selected from the group consisting of sulfur and selenium and Y is a material located between layers of MX.sub.2. The compositions may be prepared by the steps of first forming a suspension of the MX.sub.2 in a body of water. A liquid which is immiscible with water is added to the suspension. The suspension and immiscible liquid are agitated together to form a temporary emulsion. The emulsion is allowed to rest until the water and the liquid separate with an interface therebetween. A sheet-like composition of MX.sub.2 :Y forms at the interface. Preferably, the MX.sub.2 is in exfoliated, singular molecular thickness layers suspended in the water.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: February 26, 1991
    Assignee: Simon Fraser University
    Inventors: W. M. Ranjith Divigalpitiya, Robert F. Frindt, S. Roy Morrison
  • Patent number: 4981658
    Abstract: Process for the fine purification of fission molybdenum, dissolved in ionic form together with ions of the fission products of I, Sn, Ce, Ru and Zr in aqueous mineral acid solution, in which the fission molybdenum is fixed by a metal oxide in a sorption step and is then released in a desorption step, comprising: (a) passing the aqueous solution over an amphoteric oxide to sorb the ions of Mo, I, Ce, Ru, Sn and Zr, (b) drying the resulting charged oxide and thereafter heating the dried oxide to a temperature of about 1200.degree. C. to about 1300.degree. C. to sublimate the Mo, and at the same time passing a carrier stream containing water vapor and oxygen over the charged oxide to take up the Mo, and (c) desublimating Mo out of the carrier gas stream by cooling to a temperature below 600.degree. C., and followed by further cooling to room temperature, dissolving the resulting Mo residue in an aqueous solution of a strong alkali to form a molybdate solution.
    Type: Grant
    Filed: May 9, 1989
    Date of Patent: January 1, 1991
    Assignee: Kernforschungezentrum Karlsruhe GmbH
    Inventors: Sameth A. H. Ali, Jochen Buerck
  • Patent number: 4976930
    Abstract: According to a method and apparatus for inducing a photochemical reaction, a substrate is placed in a closed cell with a window for transmitting an ultraviolet beam therethrough and is located to oppose the window, a gas is filled to cause the phtoochemical reaction upon irradiation of the ultraviolet beam into the cell, ultraviolet pulses are repetitively controlled to emit at a predetermined intensity, an ultraviolet beam size and shape are adjusted in accordance with a size and a shape of an irradiation portion of the substrate, the repetition frequency of the ultraviolet beam is adjusted and set to effectively cause the photochemical reaction on the substrate in accordance with the adjusted ultraviolet beam size and shape, and the ultraviolet beam having the set beam size and shape at the repetition frequency is irradiated through the window of the cell.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: December 11, 1990
    Assignee: NEC Corporation
    Inventors: Shunji Kishida, Hiroyuki Yokoyama, Yukio Morishige, Kunihiko Washio
  • Patent number: 4966760
    Abstract: A method for recovering chromium from chromium-bearing material which comprises heating the material which can contain any one or combination of Co, Ni, Fe, Mo, and W with solid alkali metal hydroxide in an oxidizing atmosphere at 600.degree. C.-1000.degree. C. to form a fused material containing water soluble compounds of Cr, Mo, and W contained therein. The fused material is cooled and contacted with water to form a leach solution and a residue. The leach solution is adjusted to a pH of from about 5-8 with sulfuric acid, and a water soluble calcium salt is added. The chromium-rich liquor is then adjusted to a pH of 1-3 with sulfuric acid. Sodium metabisulfite is added to the chromium-rich liquor to reduce the chromium to the trivalent state after which the pH is adjusted to 5-8 with a base to form a precipitate of essentially all of the chromium.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: October 30, 1990
    Inventors: Judith A. Ladd, Joseph E. Ritsko
  • Patent number: 4963336
    Abstract: Directed to a process for producing a tungsten product of enhanced purity from ammonium paratungstate (APT) with a minimum number of processing steps which comprises mixing the APT with an ammonium solution, autoclaving the mixture at a temperature above the boiling point thereof to dissolve the APT and recrystallizing APT from the solution to yield an APT product of enhanced marketability.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: October 16, 1990
    Assignee: AMAX Inc.
    Inventors: Leo W. Beckstead, Tom C. Kearns, Eddie C. Chou
  • Patent number: 4961910
    Abstract: Methods are disclosed for recovering one or more of the metals of tungsten and molybdenum from metal-cellulose material. One method involves digesting the material in a mineral acid selected from the group consisting of hydrochloric acid having a concentration of at least about 4 normal, and sulfuric acid having a concentration of at least about 9 normal at a temperature of at least about 50.degree. C. for a sufficient time to form a digestion solid containing the major portion of the tungsten and a digestion solution containing a portion of any molybdenum which is present in the material, and separating the solid from the solution. Another method involves having as the starting material a metal-cellulose material comprising one or more of the metals of tungsten and molybdenum and elements selected from the group consisting of arsenic, phosphorus, silicon, and combinations thereof.
    Type: Grant
    Filed: July 6, 1987
    Date of Patent: October 9, 1990
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, John A. Powers
  • Patent number: 4954168
    Abstract: A method is provided for treating sludge containing substantial amounts of chromium, aluminum and iron and residuals of other elements. The method comprises forming a slurry of the sludge in water at a temperature ranging from ambient to 150.degree. F. with the specific gravity of the slurry ranging from about 1.05 to 1.25, and adding a mineral acid to the slurry to provide a pH ranging from about 0.1-3 to dissolve selectively the aluminum and the chromium and leave a solids residue containing gangue material comprising an oxidized iron compound, calcium sulfate, calcium fluoride, calcium silicate among other solids. The pH of the solution is controlled at range of about 2 to 3.5 to precipitate undesirable elements, including iron, without substantially adversely affecting the dissolved chromium and aluminum.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: September 4, 1990
    Assignee: AMAX Inc.
    Inventors: Ranko Crnojevich, Edward I. Wiewiorowski, Andrew B. Case
  • Patent number: 4933152
    Abstract: A process for purifying molybdenum, which comprises first leaching impure molybdenum trioxide containing potassium in a liquid medium of nitric acid, and an ammoniacal liquor, wherein the nitric acid concentration is about 3.5 to 4.0 moles per liter and the ammonium nitrate concentration is about 0.5 to 1.0 moles per liter, at greater than 50.degree. C. to solubilize the major portion of the potassium and produce a once-leached molybdenum trioxide and a first liquor, removing the once-leached molybdenum oxide from the first liquor, re-leaching the once-leached molybdenum trioxide in nitric acid having a concentration of about 3.5 to 4.0 moles per liter, at greater than 50.degree. C. to produce a twice-leached molybdenum trioxide and a second liquor, removing the twice-leached molybdenum oxide from the second liquor, water washing the twice-leached molybdenum trioxide, digesting the molybdenum trioxide in ammonium hydroxide at greater than 50.degree. C. at a pH of greater than 9.
    Type: Grant
    Filed: February 16, 1989
    Date of Patent: June 12, 1990
    Assignee: GTE Products Corporation
    Inventors: Judy L. Scheftic, James N. Christini
  • Patent number: 4927794
    Abstract: A process is disclosed to extract metal values selected from the group consisting of cobalt, molybdenum, nickel, tungsten, and vanadium from metal-containing particles, such as spent hydroprocessing catalyst particles containing carbon residue. In this process, the spent catalyst particles are roasted in an oxygen-containing gas at a temperature of from 400.degree. C. to 600.degree. C., and then the roasted catalyst particles are contacted with an aqueous solution of ammonia, ammonium salt, and hydrogen peroxide. That aqueous solution has an initial pH of at least 9.5 and an initial hydrogen peroxide concentration of from 0.02 to 0.2 M. That aqueous solution is maintained at a pH of greater than 9.5.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: May 22, 1990
    Assignee: Chevron Research Company
    Inventor: Paul J. Marcantonio
  • Patent number: 4910000
    Abstract: A method of extracting tungsten values from tungsten containing ores comprising step (i) forming a mixture of a tungsten containing ore and a first mineral acid adapted to consume acid consuming substances in the ore and step (ii) thereafter adding organic anions to produce a solution containing dissolved tungsten values.
    Type: Grant
    Filed: February 24, 1988
    Date of Patent: March 20, 1990
    Assignee: The University of Melbourne
    Inventor: Thomas R. A. Davey
  • Patent number: 4861565
    Abstract: Metal values including those of cobalt, vanadium, aluminum, molybdenum and tungsten are recovered from spent petroleum refining catalyst by acid leaching the metal values except those of molybdenum or tungsten, separating the resulting solution from the leach residue and selectively recovering the cobalt, vanadium and aluminum values from the solution and recovering the molybdenum and tungsten values from the leach residue.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: August 29, 1989
    Assignee: The Hall Chemical Company
    Inventors: Verner B. Sefton, Robert Fox, William P. Lorenz
  • Patent number: 4839022
    Abstract: Heavy hydrocarbon containing sludges such as refinery waste streams, oil storage tank sludges and marine oil tanker ballast are treated by passing the sludges in a flow stream through an indirect dryer to vaporize liquids having a boiling point at atmospheric pressure of less than about 700.degree. F. and to provide substantially dried solid particles discharged from the dryer. The dried particles, containing heavy hydrocarbons as a coating or as a part of the solids, are conducted to a combustor/oxidizer and exposed to a high velocity flow stream of oxygen containing gas, typically low pressure forced air, to burn the residual hydrocarbons in the solids and to reduce heavy metals and the like to oxides thereof. A sludge handling system includes a rotary disk type indirect dryer connected to a lift pipe type combustor/oxidizer for thorough exposure of the dried solids to an oxygen containing atmosphere.
    Type: Grant
    Filed: November 8, 1985
    Date of Patent: June 13, 1989
    Assignee: Atlantic Richfield Company
    Inventor: James L. Skinner
  • Patent number: 4834963
    Abstract: In the alumino-thermit method of producing tungsten monocarbide powders, metallic iron is added to the reaction charge in quantities to control the calculated reaction temperature within the range of about 4372.degree. to about 4500.degree. F. It has been found that this process can now be controlled to produce macrocrystalline tungsten carbide powders which are very low in Ti, Ta and Nb content and have a very narrow range of total carbon contents.
    Type: Grant
    Filed: December 16, 1986
    Date of Patent: May 30, 1989
    Assignee: Kennametal Inc.
    Inventors: Charles J. Terry, Jack D. Frank
  • Patent number: 4822590
    Abstract: Novel single layer materials of the form MX.sub.2, where MX.sub.2 is a layer-type dichalcogenide such as MoS.sub.2, TaS.sub.2, WS.sub.2, or the like, exfoliated by intercalation of an alkali metal, and immersion in water, are disclosed. MoS.sub.2 has been exfoliated into monolayers by intercalation with lithium followed by reaction with water. X-ray diffraction analysis demonstrates that the exfoliated MoS.sub.2 in suspension is in the form of one-molecule-thick sheets. X-ray patterns from dried and re-stacked films of exfoliated MoS.sub.2 indicate that the layers are randomly stacked. By adsorbing monolayers or precipitating clusters of various species such as compounds of Co, Ni, Pb, Cd, Al, Ce, In and Zn, on MoS.sub.2 while the sulfide is suspended as single layers and then recrystallizing, a new group of inclusion compounds can be formed. In the re-crystallized or re-stacked materials, the inter-layer spacing can be expanded or contracted compared to MoS.sub.2.
    Type: Grant
    Filed: April 23, 1986
    Date of Patent: April 18, 1989
    Assignee: Simon Fraser University
    Inventors: S. Roy Morrison, Robert F. Frindt, Per Joensen, Michael A. Gee, Bijan K. Miremadi
  • Patent number: 4808384
    Abstract: A process is disclosed for recovering tungsten, iron, and manganese from tungsten bearing material. The process involves digesting the material in a sufficient amount of sulfuric acid at a temperature of at least about 80.degree. C. for a sufficient time in the presence of coal as a reducing agent to form a digestion solution containing the major portion of the scandium, iron, and manganese and a digestion residue containing the major portion of the tungsten, followed by separating the solution from the residue. The major portion of the scandium can be extracted from the digestion solution with an organic solution consisting essentially of a mixture of tertiary alkyl primary amines which are present in an amount sufficient to extract the major portion of the scandium, and the balance an essentially aromatic solvent. The scandium is stripped from the organic with hydrochloric acid which is then separated from the stripped organic.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: February 28, 1989
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Judith A. Ladd, Martin B. MacInnis, Mary A. Fedorchak
  • Patent number: 4793852
    Abstract: This invention relates to a method of recovering non-ferrous metal sulfides from a metal ore which comprises subjecting the metal ore, in the form of an aqueous pulp, to a froth flotation process in the presence of a flotating amount of a flotation collector wherein the collector comprises a compound which corresponds to one of the formulas ##STR1## wherein R.sup.1 is alkyl, aryl or aralkyl group wherein the aryl and aralkyl can be substituted with a halo or alkyl moiety;R.sup.2 is alkyl, aryl or aralkyl group wherein the aryl or aralkyl can be substituted with a halo or alkyl moiety;R.sup.3 is aryl or aralkyl unsubstituted or substituted with a halo or alkyl moiety;R.sup.4 is alkyl, aryl or aralkyl group wherein the aryl or aralkyl can be substituted with a halo or alkyl moiety; with the proviso that at least one of R.sup.1 and R.sup.2 must be aryl or aralkyl unsubstituted or substituted;under conditions such that the metal sulfide values are recovered in the froth.
    Type: Grant
    Filed: October 28, 1985
    Date of Patent: December 27, 1988
    Assignee: The Dow Chemical Company
    Inventors: Guy H. Harris, Patrice K. Ackerman, Frank F. Aplan
  • Patent number: 4784687
    Abstract: The scarcity of high grade tungsten ores obliges users to seek to recover it from scrap materials, but drill bits in particular pose especial problems. Existing proposals to use acidic hydrogen peroxide to oxides and solubilize tungsten is extremely inefficient in reagent consumption per unit tungsten recovered.According to the present invention, hydrogen peroxide can be used considerably more efficiently in the extraction of tungsten into an aqueous acidic solution by employing certain promoters which are solid at 50.degree. C. in the form of fused blocks. These blocks release the promoter slowly into the reaction solution and achieve similar efficiency of use of hydrogen peroxide and acid but at markedly reduced consumption of promoter in comparison with the same promoter added in powder or granular form. Examples of such promoter are hydroxy or amino substituted aromatic carboxylic acids e.g. 2-hydroxybenzoic acid. The promoters can most conveniently be used in a multi-stage tungsten extraction process.
    Type: Grant
    Filed: March 18, 1986
    Date of Patent: November 15, 1988
    Assignee: Interox Chemicals Limited
    Inventors: Diana M. Anderson, Denis A. Hutton
  • Patent number: 4784688
    Abstract: The scarcity of high grade tungsten ores obliges users to seek to recover it from scrap materials, but drill bits in particular pose special problems. Existing proposals to use acidic hydrogen peroxide to oxidize and solubilize tungsten are extremely inefficient in reagent consumption per unit tungsten recovered.According to the present invention hydrogen peroxide can be used considerably more efficiently with sub-stoichiometric reagent addition per stage, especially from 6 to 12 stages and by the use of a small amount of certain promoters which it is believed may form a water-soluble complex with tungsten which provides an alternative route for tungsten dissolution. Many of the promoters are aromatic hydroxyl or amino acids such as 2-hydroxybenzoic acid, 2-aminobenzoic acid, 4-hydroxybenzene-phenol and its related oxidation products such as 1,4-benzoquinone. Also, certain aliphatic acids such as tartaric and epoxy succinic acid show some promotional activity.
    Type: Grant
    Filed: March 18, 1986
    Date of Patent: November 15, 1988
    Assignee: Interox Chemicals Limited
    Inventor: Diana M. Anderson
  • Patent number: 4781944
    Abstract: Heavy metals and compounds thereof and other toxic materials in industrial wastes, sludges, soils, incinerated ashes and the like are fixed and stablized in a char residue, obtained by critical region pyrolyzing techniques and appropriate proportions of cabonaceous materials intimately mixed with the sludge, to encapsulate the heavy metals with carbon bonded thereto which effectively detoxifies the residue and renders it immune to any substantial leaching out or later exposure to the toxic metals, such that the same is environmentally safe for such uses as landfill and the like.
    Type: Grant
    Filed: February 20, 1986
    Date of Patent: November 1, 1988
    Inventor: Bradford H. Jones
  • Patent number: 4752332
    Abstract: A process for treating a first metal, manganese-containing ore comprising contacting the manganese-containing ore with an aqueous, acidic composition and a material containing at least one metal sulfide at conditions effective to (1) chemically reduce at least a portion of the manganese, (2) solubilize at least a portion of the metal from the metal sulfide, and (3) at least partially liberate the first metal from the ore; and recovering the first metal from the ore. The use of Thiobacillus ferrooxidans and/or added ferric ion in the contacting step are also disclosed.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: June 21, 1988
    Assignee: Ensci, Inc.
    Inventors: Rebekah Wu, Larry B. Tsai, Barbara A. Krebs-Yuill, David A. Milligan, Nestor J. Troncoso, John S. McBride, Albert T. Knecht
  • Patent number: 4747940
    Abstract: Tri-alkali metal di(carboxyalkyl) dithiocarbamates and triammonium-di(carboxyalkyl) dithiocarbamates which can be characterized by the formula ##STR1## wherein R and R' can be the same or different and are selected from the group consisting of alkylene radicals, preferably alkylene radicals each preferably having from 1 to 12 carbon atoms, and wherein M is selected from the group consisting of alkali metal atoms and ammonium; their use as ore flotation depressants; and a process for making these novel compositions are disclosed.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: May 31, 1988
    Assignee: Phillips Petroleum Company
    Inventors: Kenneth B. Kimble, Clarence R. Bresson, Harold W. Mark
  • Patent number: 4740243
    Abstract: A process for recovering at least one first metal from a metal sulfide-containing ore comprising contacting the ore with an aqueous, acidic composition and at least one reducible manganese-containing material at conditions effective (1) to chemically reduce the manganese, (2) solubilize at least a portion of the metal from the sulfide, and (3) at least partially liberate the first metal from the ore; and recovering the first metal from the ore. The use of added ferric ion and/or Thiobacillus ferrooxidans bacteria in the above-noted contacting is also disclosed.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: April 26, 1988
    Assignee: Ensci, Inc.
    Inventors: Barbara A. Krebs-Yuill, Larry B. Tsai, Rebekah Wu, David A. Milligan, Nestor J. Troncoso
  • Patent number: 4732827
    Abstract: A process for producing an anolyte and a catholyte for redox cells which comprises the steps of heating chromium ore together with carbonaceous substances to produce a pre-reduced chromium product produced a part of iron and chromium in chromium ore, dissolving the pre-reduced chromium product in hydrochloric acid and/or sulfuric acid iron and chromium. Thus, the dissolving step can be simplified, the predetermined concentration can be simply regulated.
    Type: Grant
    Filed: July 2, 1986
    Date of Patent: March 22, 1988
    Assignees: Japan Metals and Chemical Co., Ltd., Agency of Industrial Science and Technology
    Inventors: Hiroko Kaneko, Ken Nozaki, Takeo Ozawa, Koichi Oku, Takashi Shimanuki, Yoshinori Koga
  • Patent number: 4724128
    Abstract: A method is disclosed for purifying molybdenum which involves reducing a molybdenum compound selected from the group consisting of molybdenum trioxide, ammonium dimolybdate, and ammonium paramolybdate to molybdenum dioxide which is then water washed to remove potassium, and produce a purified molybdenum dioxide having a potassium content of no greater than about 30 weight ppm, followed by separating the wash water from the purified molybdenum dioxide.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: February 9, 1988
    Assignee: GTE Products Corporation
    Inventors: Michael J. Cheresnowsky, Edward L. Bok, Martin B. MacInnis
  • Patent number: 4687647
    Abstract: Molybdenite, MoS.sub.2, is completely converted into molybdenum dioxide, MoO.sub.2, by mixing MoS.sub.2 with petroleum or coal tar pitches and heating in air at 400.degree.-600.degree. F.
    Type: Grant
    Filed: January 8, 1987
    Date of Patent: August 18, 1987
    Inventor: Lloyd Berg
  • Patent number: 4680169
    Abstract: An improved process for reducing ammonium ion concentration in an ammonium ion-containing, acidic liquor is provided. The process includes the essential step of reacting ammonium ion with a persulfate.
    Type: Grant
    Filed: December 30, 1985
    Date of Patent: July 14, 1987
    Assignee: Allied Corporation
    Inventor: Thomas R. Morgan
  • Patent number: 4670229
    Abstract: Metal values and alumina are recovered from spent, usually oily, catalysts by oxygen pressure leaching with sodium hydroxide and/or sodium aluminate to dissolve molybdenum, vanadium and/or tungsten and provide a solid, filterable residue containing alumina and cobalt and/or nickel, the residue is digested with sodium hydroxide to give a sodium aluminate solution and a residue enriched in nickel and/or cobalt, alumina is recovered from the sodium aluminate solution as a solid and the remaining supernatant solution is recycled to the oxygen pressure leaching step wherein the alumina content of the aluminate solution is precipitated and a bleed for metals in the aluminate solution is provided.
    Type: Grant
    Filed: May 9, 1986
    Date of Patent: June 2, 1987
    Assignee: Amax Inc.
    Inventors: Edward I. Wiewiorowski, Luther R. Tinnin, Ranko Crnojevich
  • Patent number: 4670244
    Abstract: Metal ions are reduced from a higher to a lower oxidation stage using ferrophosphorus as the reductant.
    Type: Grant
    Filed: October 1, 1985
    Date of Patent: June 2, 1987
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wouter Roos, Bernardus J. Damman, Arie Lagendijk, Dieter Steidl, Raban von Schenck
  • Patent number: 4668483
    Abstract: A process is disclosed for recovering chromium from a chromium bearing material containing cobalt, molybdenum, and tungsten. The process involves roasting the material and alkali metal compound at a temperature of at least about 400.degree. C. for a sufficient time to react the alkali metal compound with the material and form a reacted mixture containing essentially all of the chromium, molybdenum, and tungsten as alkali salts. The reacted mixture is water leached to dissolve the alkali salts and form a leach solution containing essentially all of the chromium, molybdenum, and tungsten, and a leach solid containing essentially all of the cobalt. After separation of the leach solution from the leach solid, the pH of the leach solution is adjusted to from about 0.5 to about 3.0 with an acid and a sufficient amount of a reducing agent is added to reduce essentially all of the chromium to the trivalent state.
    Type: Grant
    Filed: May 12, 1986
    Date of Patent: May 26, 1987
    Assignee: GTE Products Corporation
    Inventors: Judith A. Ladd, Clarence D. Vanderpool
  • Patent number: 4666685
    Abstract: Spent hydrodesulfurization catalysts containing alumina, at least one metal from the group consisting of molybdenum, tungsten and vanadium and at least one metal from the group consisting of nickel and cobalt, sulfur, and, usually, residual oil are oxygen pressure leached at a temperature of at least about 400.degree. F. with a base from the group consisting of sodium hydroxide and sodium aluminte in at least stoichimetric amount to yield a solution having a pH between about 7 and 9 containing dissolved molybdenum, vanadium and any tungsten which may be recovered and a readily filterable residue containing aluminum, nickel and cobalt which may be worked up to recover the valuable constituents, with overall processing being accomplished in an environmentally acceptable manner.
    Type: Grant
    Filed: May 9, 1986
    Date of Patent: May 19, 1987
    Assignee: Amax Inc.
    Inventor: Edward I. Wiewiorowski
  • Patent number: 4657745
    Abstract: A process for the recovery of aluminum and at least one other metal selected from the group consisting of molybdenum, nickel and cobalt from a spent hydrogenation catalyst comprising (1) adding about 1 to 3 parts H.sub.2 SO.sub.4 to each part of spent catalyst in a reaction zone of about 20.degree. to 200.degree. C. under sulfide gas pressure between about 1 and about 35 atmospheres, (2) separating the resultant Al.sub.2 (SO.sub.4).sub.3 solution from the sulfide precipitate in the mixture, (3) oxidizing the remaining sulfide precipitate as an aqueous slurry at about 20.degree. to 200.degree. C. in an oxygen-containing atmosphere at a pressure between about 1 and about 35 atmospheres, (4) separating the slurry to obtain solid molybdic acid and a sulfate liquor containing said at least one metal, and (5) recovering said at least one metal from the sulfate liquor in marketable form.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: April 14, 1987
    Assignee: Chemical & Metal Industries, Inc.
    Inventor: David E. Hyatt
  • Patent number: 4649031
    Abstract: The invention relates to a method for recovering rare metals from the combustion residues of various coals, in particular brown coals. The recovery is performed by digestion, more particularly by aqueous and/or dilute alkaline and/or dilute acidic digestion, where two or three of these steps can be combined in any desired order or they may be carried out separately. During digestion the concentration of the solution is monitored and the subsequent digestion steps are terminated at a desired concentration. The solid and liquid phase are then separated and the rare metals are isolated from the liquid phase while the solid phase, optionally after neutralization and/or washing can be utilized for example as a source of energy.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: March 10, 1987
    Assignee: Tatabanyai Szenbanyak
    Inventors: Bela Matyas, Pal Gerber, Andras Solymos, Ferenc Kaszanitzky, Gyorgy Panto, Janos Leffler
  • 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: 4634467
    Abstract: An improved hydrometallurgical process for the recovery of metallic copper, elemental sulfur, compounds of molybdenum and other valuable materials from copper sulfide ore concentrates, such as chalcopyrite. The process, comprising a reduction stage, metallic copper recovery stage, and a combined regeneration-purge-oxidation stage, is improved by the addition of a second reduction stage following the first or primary reduction stage, and by the addition of a by-product recovery stage after the second or secondary reduction stage. The secondary reduction stage also enhances overall process performance by allowing more flexible operating practices.
    Type: Grant
    Filed: July 30, 1985
    Date of Patent: January 6, 1987
    Assignee: Duval Corporation
    Inventor: Leonard R. Ochs
  • 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: 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: 4626280
    Abstract: A process is disclosed for recovering tungsten, iron, and manganese from tungsten bearing material. The process involves digesting the material in a sulfur dioxide solution at a sufficient temperature for a sufficient time to form a digestion solution containing the major portion of the scandium, iron, and manganese, and a digestion solid containing the major portion of the tungsten which is separated from the digestion solution. The major portion of the scandium is extracted from the digestion solution with an organic consisting essentially of an extracting agent which is essentially a mixture of alkyl primary amines which are present in an amount sufficient to extract the major portion of the scandium without extracting appreciable amounts of iron and manganese, and the balance an essentially aromatic solvent. After separation of the scandium containing organic from the raffinate, the organic is stripped of the scandium with hydrochloric acid which is then separated from the stripped organic.
    Type: Grant
    Filed: January 24, 1986
    Date of Patent: December 2, 1986
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Martin B. MacInnis, Judith A. Ladd
  • Patent number: 4619690
    Abstract: Disclosed is a process for beneficiating chromite ore. The process can also be used to remove SO.sub.2 from SO.sub.2 -air mixtures which would ordinarily be vented. The chromite ore is pulverized and preferably mixed with sodium sulfate. Ammonium carbonate can also be added for subsequent vaporization to increase porosity. Sulphur oxide-oxygen roasting of the chromite ore is conducted at elevated temperatures in the approximate range between 300.degree. and 1,000.degree. C. or higher at approximately atmospheric pressures. After roasting, the ore is preferably leached using an aqueous ferric sulfate solution to remove soluble undesired constituents from the roasted chromite ore. The beneficiated chromite ore shows improved chromium concentrations and chromium to iron ratios when compared to the original ore.
    Type: Grant
    Filed: February 6, 1984
    Date of Patent: October 28, 1986
    Assignee: Idaho Research Foundation, Inc.
    Inventors: Patrick R. Taylor, Matthew A. Omofoma
  • Patent number: 4613361
    Abstract: A process for pretreatment at high temperature by means of an aqueous pretreatment solution, of crushed ores containing at least one usable metal element, whose gangue contains argillaceous compounds which, in the attack operation for making use of the ore, are capable of forming a stable plastic suspension in the presence of water, which makes it virtually impossible subsequently to separate the liquid and solid phases by virtue of its character being such that it cannot be subjected to filtration and/or settlement, which is characterized in that, to cause stabilization of the argillaceous gangue before the operation of subjecting the ore to attack and to produce easy separation of the liquid and solid phases after the attack operation, the ore, the granulometry of which is at most equal to the liberation sieve mesh size of the metal or metals to be put to use, and before being subjected to the attack operation for making use of the ore, is brought into contact with an aqueous pretreatment solution containin
    Type: Grant
    Filed: November 28, 1984
    Date of Patent: September 23, 1986
    Assignee: Uranium Pechiney
    Inventors: Jean-Michel Lamerant, Francois Pallez, Pierre-Bernard Personnet
  • Patent number: 4610722
    Abstract: A process is provided for hydrometallurgical processing of steel plant dusts containing cadmium, lead, zinc, and iron values, along with impurities such as chloride and fluoride salts of sodium, potassium, magnesium, etc. The first step in the process involves leaching the dust in a mixed sulfate-chloride medium that dissolves most of the zinc and cadmium. Any iron and aluminum dissolved in this step is precipitated by oxidation and neutralization. Zinc is recovered from the resulting solution by solvent extraction which provides a raffinate which is recycled to the leaching step with a bleed stream also provided for recovery of cadmium and removal of other impurities from the circuit. The lead sulfate residue from the leaching step is leached with caustic soda, and zinc dust is used to cement the lead out from the caustic solution, which then joins the main solution for zinc recovery.
    Type: Grant
    Filed: January 31, 1985
    Date of Patent: September 9, 1986
    Assignee: AMAX Inc.
    Inventors: Willem P. C. Duyvesteyn, Robert F. Hogsett
  • Patent number: 4608235
    Abstract: A process is disclosed for recovering cobalt from an alloy containing other metals as chromium, tungsten, etc. The process involves first adding the alloy to fused sodium hydroxide at a temperature of from about 750.degree. C. to about 1000.degree. C. to form a reaction mixture, the amount of sodium hydroxide being sufficient to subsequently form sodium salts which are essentially those of chromium and tungsten and hydroxides which are essentially those of cobalt and nickel. The reaction mixture is then heated at a sufficient temperature for a sufficient time while introducing an oxidizing gas into the reaction mixture to form a melt which consists essentially of the sodium salts and the hydroxides, followed by cooling the melt. The cooled melt is then contacted with sufficient water to form a solution containing the major portion of the sodium salts and a solid containing the major portion of the hydroxides, followed by separating the solid from the solution.
    Type: Grant
    Filed: March 21, 1985
    Date of Patent: August 26, 1986
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Richard A. Scheithauer, Richard G. W. Gingerich
  • Patent number: 4604265
    Abstract: A process is disclosed for recovering tungsten and rhenium from a tungsten and rhenium source. The process involves firing the source in an oxidizing atmosphere at a sufficient temperature for a sufficient time to convert the tungsten and rhenium to their respective oxides, to remove a portion of the rhenium as volatilized oxide, and to form a first fired material containing essentially all of the tungsten and the remaining portion of the rhenium, increasing the surface area of the resulting oxidized tungsten, and firing the first fired material in an oxidizing atmosphere at a sufficient temperature for a sufficient time to remove essentially all of the remaining portion of the rhenium as volatilized oxidized rhenium and to form an essentially rhenium-free oxidized tungsten.
    Type: Grant
    Filed: August 22, 1985
    Date of Patent: August 5, 1986
    Assignee: GTE Products Corporation
    Inventors: Alan D. Douglas, Kenneth T. Reilly, John E. Landmesser, Richard E. Landry, Martin B. MacInnis
  • Patent number: 4603004
    Abstract: The precipitation product of sodium tungstate dihydrate from a melt of sodium acetate-trihydrate is a nucleating agent for latent heat storage medium on the basis of sodium acetate-trihydrate, which produces a sure and from the first storage cycle on defect-free nucleation of the sodium acetate-trihydrate at the melting point or only a few degrees below the melting point.
    Type: Grant
    Filed: March 26, 1985
    Date of Patent: July 29, 1986
    Assignee: U.S. Philips Corporation
    Inventors: Johann Schroder, Vera Piel-Nicklich
  • Patent number: 4598057
    Abstract: The process of regenerating a stable organic soluble molybdenum-containing catalyst suitable for epoxidation of olefins with a hydroperoxide which comprises thermally precipitating and separating a molybdenum-containing solid obtained from a spent catalyst stream derived from a molybdenum catalyzed epoxidation of an olefin and solubilizing the precipitated solid by contacting with a liquid composition comprising a peroxy compound, a monohydroxy alcohol, optionally a polyhydroxy alcohol, and an organic dicarboxylic acid present in an amount of at least about 0.2 parts, by weight, of molybdenum contained in said solid.
    Type: Grant
    Filed: October 26, 1984
    Date of Patent: July 1, 1986
    Assignee: Atlantic Richfield Company
    Inventor: Bruce H. Isaacs
  • Patent number: RE32612
    Abstract: Tungsten monocarbide is prepared by sparging a molten composition comprising an alkali metal halide and an oxygen compound of tungsten with a gas comprising a gaseous hydrocarbon, particularly methane.
    Type: Grant
    Filed: April 24, 1986
    Date of Patent: February 23, 1988
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: John M. Gomes, Andrea E. Raddatz, Elizabeth G. Baglin