With Acid Patents (Class 423/132)
  • Patent number: 10486977
    Abstract: A method of purifying a spinel powder includes contacting a spinel powder with an acid solution to form an acid-washed spinel composition and contacting the acid-washed spinel composition with a basic solution to form a purified composition. The purified powder is suited to formation of low-absorption shaped bodies, such as windows for high intensity laser devices.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: November 26, 2019
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Woohong Kim, Guillermo R. Villalobos, Colin C. Baker, Shyam S. Bayya, Michael Hunt, Bryan Sadowski, Ishwar D. Aggarwal, Jasbinder S. Sanghera
  • Patent number: 10385422
    Abstract: Method of removing cobalt deposits in a reactor for the cobalt-catalyzed high-pressure hydroformylation of olefins by treatment with aqueous nitric acid, wherein the reactor is at least partly filled with aqueous nitric acid and the temperature of the aqueous nitric acid is increased during the treatment.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: August 20, 2019
    Assignee: BASF SE
    Inventors: Jens Rudolph, Rainer Papp
  • Patent number: 9487636
    Abstract: The present disclosure relates to an inorganic, halogen-free flameproofing agent made of modified, rehydrated red mud (MR2S), having a mineral composition of 10 to 50 weight percent of iron compounds, 12 to 35 weight percent of aluminum compounds, 5 to 17 weight percent of silicon compounds, 2 to 21 weight percent of TiO2, and 0.5 to 6 weight percent of calcium compounds, wherein the compounds of iron have a hydroxide and oxide hydrate fraction greater than or equal to 50 weight percent relative to the oxide fraction of the iron compounds, and wherein the compounds of aluminum have a hydroxide and oxide hydrate fraction greater than or equal to 50 weight percent. The disclosure further relates to a flameproofed material system comprising a flammable material and the inorganic, halogen-free flameproofing agent and to a method for the production thereof.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: November 8, 2016
    Assignee: FLUORCHEMIE GMBH FRANKFURT
    Inventors: Christian Rocktäschel, Heinzhorst Möbius
  • Patent number: 8986634
    Abstract: The present invention refers to a method being easy to recover metals including nickel and aluminum from waste aluminum catalysts, thereby entirely promoting the recovering rate. Said method comprises: preparing and roasting a waste aluminum catalyst with sodium salts, and then obtaining a first solution comprising vanadium and molybdenum, and a dreg comprising nickel and aluminum through leaching and filtrating; collecting and mixing the dreg with alkali powders to obtain a mixture of the dreg and alkali powders, roasting the mixture at 300 to 1000° C. with aluminum in the dreg reacting with hydroxyl generated from the roasting of mixture and further generating aluminum hydroxide, and then obtaining a second solution comprising aluminum and a concentrate having nickel through another leaching and filtrating; and recovering aluminum from the second solution and recovering nickel from the concentrate.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: March 24, 2015
    Inventor: Ping-Tao Wu
  • Patent number: 8945493
    Abstract: The invention relates to non-ferrous metallurgy and can be used for extracting beryllium from genthelvite and bertrandite groups when processing the raw minerals (ores, concentrates) by heap and vat leaching. The objective of the invention is to disclose a method of teaching beryllium from danalite (Fe8(BeSiO4)6S2), genthelvite (Zn8(BeSiO4)6S2), helvite (Mg8(BeSiO4)6S2), chrysoberyl, euclase, and bertrandite, thus expanding the range of raw minerals used for processing and providing more economical production and improved environmental impact via use of an effective reagent at low temperatures by hydrochemical method. The offered method is beneficial both economically and ecologically, as the alternate modern pyrometallurgical method of beryllium extraction has the following drawbacks: emission of toxic gases, high energy requirements, and the need for fireproof materials.
    Type: Grant
    Filed: April 17, 2013
    Date of Patent: February 3, 2015
    Assignee: Kazakh National University named after Al-Farabi
    Inventors: Habibulla Kusainovich Ospanov, Galymkair Mutanovich Mutanov, Beibit Zholdybaevich Arinov, Serik Kasymovich Kozhahmetov, Aishagul Batyrbekovna Baiboldieva, Nazira Habibyllakyzy Ospanova, Vera Anatolevna Rybakova
  • Patent number: 8945492
    Abstract: The invention relates to non-ferrous metallurgy and is used for extracting beryllium from genthelvites when processing the raw minerals (ores, concentrates) by heap and vat leaching. The objective of the invention is to disclose a method of leaching beryllium from danalite (Fe8(BeSiO4)6S2), genthelvite (Zn8(BeSiO4)6S2), and helvite (Mg8(BeSiO4)6S2), thus expanding the range of raw minerals used for processing and providing more economical production and improved environmental impact via use of an effective reagent at low temperatures by hydrochemical method. The offered method is beneficial both economically and ecologically, as the alternate modern pyrometallurgical method of beryllium extraction has the following drawbacks: emission of toxic gases, high energy requirements, and use of the fireproof materials. The newly developed method is recommended as a basis for the innovative technology of beryllium extraction from genthelvite concentrates and ores.
    Type: Grant
    Filed: April 17, 2013
    Date of Patent: February 3, 2015
    Assignee: Kazakh National University named after Al-Farabi
    Inventors: Habibulla Kusainovich Ospanov, Galimkair Mutanovich Mutanov, Beibit Zholdybaevich Arinov, Serik Kasymovich Kozhahmetov, Aishagul Batyrbekovna Baiboldieva, Nazira Habibyllakyzy Ospanova, Vera Anatolevna Rybakova
  • Publication number: 20140369907
    Abstract: There are provided processes for treating red mud. For example, the processes can comprise leaching red mud with HCl so as to obtain a leachate comprising ions of a first metal (for example aluminum) and a solid, and separating said solid from said leachate. Several other metals can be extracted from the leachate (Fe, Ni, Co, Mg, rare earth elements, rare metals, etc.). Various other components can be extracted from solid such as TiO2, SiO2 etc.
    Type: Application
    Filed: January 10, 2013
    Publication date: December 18, 2014
    Applicant: ORBITE ALUMINAE INC.
    Inventors: Richard Boudreault, Joel Fournier, Denis Primeau, Marie-Maxime Labrecque-Gilbert
  • Publication number: 20140314640
    Abstract: The invention relates to non-ferrous metallurgy and is used for extracting beryllium from genthelvites when processing the raw minerals (ores, concentrates) by heap and vat leaching. The objective of the invention is to disclose a method of leaching beryllium from danalite (Fe8 (BeSiO4) 6S2), genthelvite (Zn8 (BeSiOl) 6S2), and helvite (Mg8 (BeSiO4) 6S2), thus expanding the range of raw minerals used for processing and providing more economical production and improved environmental impact via use of an effective reagent at low temperatures by hydrochemical method. The offered method is beneficial both economically and ecologically, as the alternate modern pyrometallurgical method of beryllium extraction has the following drawbacks: emission of toxic gases, high energy requirements, and use of the fireproof materials. The newly developed method is recommended as a basis for the innovative technology of beryllium extraction from genthelvite concentrates and ores.
    Type: Application
    Filed: April 17, 2013
    Publication date: October 23, 2014
    Inventors: Habibulla Kusainovich Ospanov, Galimkair Mutanovich Mutanov, Beibit Zholdybaevich Arinov, Serik Kasymovich Kozhahmetov, Aishagul Batyrbekovna Baiboldieva, Nazira Habibyllakyzy Ospanova, Vera Anatolevna Rybakova
  • Publication number: 20140301919
    Abstract: A process for the extraction of alumina from an aluminum-bearing ore or concentrate, comprising the steps of leaching the aluminum-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of from 90° C. to the boiling point of the solution and at an Eh of at least 200 mV. After a liquid/solids separation step, the solution obtained is subjected to steps for removal of iron and for recovery of alumina.
    Type: Application
    Filed: March 13, 2014
    Publication date: October 9, 2014
    Inventors: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, Md. Abdul Halim, Dipak Patel, Paul Doherty
  • Patent number: 8834818
    Abstract: There is provided a hydrometallurgical process of recovering indium and gallium values from mixtures thereof with other metal values for example recycled and scrap solar panel cells which comprises subjecting the mixture to strongly oxidizing acid conditions, preferably via the simultaneous addition of sulfuric acid and hydrogen peroxide to the leach vessel, so as to form indium and gallium salt species of at least the major proportion of the indium and gallium values in the mixture, extracting the indium and gallium values with an organic extractant by adjusting the pH so as to extract individually the indium and gallium values with the organic extractant, stripping indium and gallium values from the extractant using an acid and an alkaline solution respectively and recovering the indium and gallium values.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: September 16, 2014
    Assignee: Molycorp Minerals Canada ULC
    Inventor: Casare G. Ferron
  • Patent number: 8679427
    Abstract: A process for neutralization is provided which can maintain a high solid content of a bauxite dissolution residual substance slurry even after a neutralization treatment is completed and the stabilize pH within a short time of the neutralization treatment. Such a process for neutralizing a bauxite dissolution residual substance containing a desiliconizing product which is generated in the production process of aluminum hydroxide using Bayer process, includes: mixing a bauxite dissolution residual substance or a bauxite dissolution residual substance slurry with sulfuric acid in an amount ranging from 0.6 to 1.2 equivalence to the total amount of sodium contained in the bauxite dissolution residual substance or a bauxite dissolution residual substance slurry, such that the solid content after mixing becomes 400 to 700 g/l to gelate the mixture, and thereafter obtaining a bauxite dissolution residual substance neutralized slurry.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: March 25, 2014
    Assignee: Showa Denko K.K.
    Inventor: Isao Ishikawa
  • Patent number: 8657917
    Abstract: A method for recycling metals from waste molybdic catalysts, comprises steps of leaching, by soaking a waste molybdic catalyst into a highly oxidized acid and conducting a reaction between sulfur in the waste molybdic catalyst and the acid to obtain sulfide and vaporizer, wherein metals in the waste molybdic catalyst are dissolved and oxidized by the acid to obtain a first solution and dregs; and refining, by further dissolving metals in the dregs into a second solution, and extracting metals in the waste molybdic catalyst from the first and second solution; wherein, the vaporizer obtained from the step of leaching is converted into highly oxidized acid and recycled in the step of leaching.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: February 25, 2014
    Assignee: Hong Jing Metal Corporation
    Inventors: Yu-Lung Sun, Ming-Zhe Tsai, Yung-Hao Liu
  • Patent number: 8597600
    Abstract: There are provided processes for extracting aluminum ions from aluminous ores and for preparing alumina. Such processes can be used with various types of aluminous ores such as aluminous ores comprising, for example, various types of metals such as Fe, K, Mg, Na, Ca, Mn, Ba, Zn, Li, Sr, V, Ni, Cr, Pb, Cu, Co, Sb, As, B, Sn, Be, Mo, or mixtures thereof.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: December 3, 2013
    Assignee: Orbite Aluminae Inc.
    Inventors: Richard Boudreault, Serge Alex, Fabienne Biasotto
  • Patent number: 8585991
    Abstract: The present invention relates to methods for recovering precious metals including silver and gold, rare metals including indium and gallium, base metals including copper, lead and zinc or a combination of precious, rare and base metals from complex oxide ores, sulfide ores or oxide and sulphide ores using an acid chloride oxidizing leach.
    Type: Grant
    Filed: May 2, 2012
    Date of Patent: November 19, 2013
    Assignee: South American Silver Corp.
    Inventors: David Dreisinger, Ralph Fitch, Cornelis Verbaan
  • Patent number: 8377840
    Abstract: Methods of fabricating nano-catalysts are described. In some embodiments the nano-catalyst is formed from a powder-based substrate material and is some embodiments the nano-catalyst is formed from a solid-based substrate material. In some embodiments the substrate material may include metal, ceramic, or silicon or another metalloid. The nano-catalysts typically have metal nanoparticles disposed adjacent the surface of the substrate material. The methods typically include functionalizing the surface of the substrate material with a chelating agent, such as a chemical having dissociated carboxyl functional groups (—COO), that provides an enhanced affinity for metal ions. The functionalized substrate surface may then be exposed to a chemical solution that contains metal ions. The metal ions are then bound to the substrate material and may then be reduced, such as by a stream of gas that includes hydrogen, to form metal nanoparticles adjacent the surface of the substrate.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: February 19, 2013
    Assignee: Babcock & Wilcox Technical Services Y-12, LLC
    Inventors: Roland D. Seals, Paul A. Menchhofer, Jane Y. Howe, Wei Wang
  • Publication number: 20120328494
    Abstract: The present invention relates to methods for recovering precious metals including silver and gold, rare metals including indium and gallium, base metals including copper, lead and zinc or a combination of precious, rare and base metals from complex oxide ores, sulfide ores or oxide and sulphide ores using an acid chloride oxidizing leach.
    Type: Application
    Filed: May 2, 2012
    Publication date: December 27, 2012
    Inventors: David DREISINGER, Ralph FITCH, Cornelis VERBAAN
  • Publication number: 20120308450
    Abstract: A method for recovering base metal values from oxide ore is provided, where the ore includes a first group metal selected from nickel, cobalt and copper. The method includes reducing ore particle size to suit the latter unit operation, favoring contact for the metal elements, contacting the ore with ferric or ferrous chloride, hydrated or anhydrous, to produce a mix of ore and iron (II or III) chloride subjecting the mixture of the ore and ferric or ferrous chloride to enough energy to decompose the chlorides into hydrochloric acid and a iron oxides from the second group, forming their respective chlorides, selectively dissolve the produced base metal chlorides, leaving the metal as oxides and in the solid state, and recovering the dissolved base metal values from aqueous solution.
    Type: Application
    Filed: July 14, 2010
    Publication date: December 6, 2012
    Applicant: VALE S.A.
    Inventors: Antonio C. Pereira, Tiago V. Berni
  • Patent number: 8287826
    Abstract: A method of purifying an aluminum source includes dissolving an aluminum ion source to provide a first solution including aluminum ions having a pH of not greater than 4.0, adjusting the pH of the first solution with a tetraalkylammonium hydroxide solution to a pH in range of 4.1 to 8.4 thereby forming an aluminum hydroxide precipitate, separating the aluminum hydroxide precipitate from the first solution, washing the separated aluminum hydroxide precipitate with an aqueous solution having a pH in a range of 4.1 to 8.4, dissolving the washed aluminum hydroxide precipitate using an acid to provide a second solution having a pH of not greater than 4.0, and forming an aluminum salt from the second solution.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: October 16, 2012
    Assignee: EEStor, Inc.
    Inventor: Lucas Pettey
  • Patent number: 8241594
    Abstract: There are provided processes for extracting aluminum ions from aluminous ores. Such processes can be used with various types of aluminous ores such as aluminous ores comprising various types of metals such as Fe, K, Mg, Na, Ca, Mn, Ba, Zn, Li, Sr, V, Ni, Cr, Pb, Cu, Co, Sb, As, B, Sn, Be, Mo, or mixtures thereof.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: August 14, 2012
    Assignee: Orbite Aluminae Inc.
    Inventors: Richard Boudreault, Serge Alex, Fabienne Biasotto
  • Patent number: 8147781
    Abstract: There is provided a method of treating a metalliferrous material, comprising providing a metalliferrous material including at least one target metallic element, solubilising the metalliferrous material so as to effect production of an intermediate product including an operative solution. The operative solution includes a solvent component and a solute component. The solute component includes at least one solute component-based target metallic element and each one of the at least one solute component-based target metallic element corresponds to a one of the at least one target metallic element of the metalliferrous material such that the operative solution includes at least one target metallic element.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: April 3, 2012
    Assignee: Sheritt International Corporation
    Inventors: Preston Carl Holloway, Michael Joseph Collins, Eugene William Yuzda
  • Publication number: 20110182786
    Abstract: A mineral processing facility is provided that includes a cogen plant to provide electrical energy and waste heat to the facility and an electrochemical acid generation plant to generate, from a salt, a mineral acid for use in recovering valuable metals.
    Type: Application
    Filed: January 20, 2011
    Publication date: July 28, 2011
    Applicant: MOLYCORP MINERALS, LLC
    Inventor: John L. Burba, III
  • Publication number: 20110076209
    Abstract: The invention provides a method of inhibiting the accumulation of DSP scale in the liquor circuit of Bayer process equipment. The method includes adding one or more particular silane based small molecules to the liquor fluid circuit. These scale inhibitors reduce DSP scale formation and thereby increase fluid throughput, increase the amount of time Bayer process equipment can be operational and reduce the need for expensive and dangerous acid washes of Bayer process equipment. As a result, the invention provides a significant reduction in the total cost of operating a Bayer process.
    Type: Application
    Filed: September 25, 2009
    Publication date: March 31, 2011
    Inventors: Timothy La, Ji Cui, John D. Kildea, David H. Slinkman
  • Patent number: 7906097
    Abstract: There is provided a process for preparing aluminium chloride comprising leaching aluminium dross residues with H2SO4 so as to obtain a leachate; and hydrochlorinating the leachate so as to obtain aluminium chloride. If desired, aluminium chloride can then be converted into alumina.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: March 15, 2011
    Assignee: Groupe Conseil Procd Inc.
    Inventors: Martin Beaulieu, Stéphane Chabot, Yves Charest, Jean-François Savard
  • Patent number: 7837961
    Abstract: There are provided processes for extracting aluminum ions from aluminous ores. Such processes can be used with various types of aluminous ores such as aluminous ores comprising various types of metals such as Fe, K, Mg, Na, Ca, Mn, Ba, Zn, Li, Sr, V, Ni, Cr, Pb, Cu, Co, Sb, As, B, Sn, Be, Mo, or mixtures thereof.
    Type: Grant
    Filed: May 7, 2008
    Date of Patent: November 23, 2010
    Assignee: Exploration Orbite VSPA Inc.
    Inventors: Richard Boudreault, Serge Alex, Fabienne Sotto
  • Patent number: 7651676
    Abstract: There is provided a process for preparing aluminium chloride comprising: leaching aluminium dross residues with HCl so as to obtain a mixture comprising a solid and a liquid; and hydrochlorinating the liquid obtained from the mixture, so as to form a precipitate comprising aluminium chloride. Such a sequence can also be used for preparing alumina. In such a case, the process can further comprise the step of converting the so-obtained aluminium chloride into alumina. In the processes previously defined, the solid so-obtained can also be leached with H2SO4, thereby generating a leachate. The leachate can also eventually be hydrochlorinated so as to increase the yield of the desired product obtained i.e. alumina or aluminium chloride.
    Type: Grant
    Filed: November 23, 2007
    Date of Patent: January 26, 2010
    Assignee: Groupe Conseil Procd Inc.
    Inventors: Martin Beaulieu, Stéphane Chabot, Yves Charest, Jean-François Savard
  • Patent number: 7556095
    Abstract: A method for treating an oil shale formation comprising dawsonite includes providing heat from one or more heaters to the formation to heat the formation. Hydrocarbon fluids are produced from the formation. At least some dawsonite in the formation is decomposed with the provided heat. A chelating agent is provided to the formation to dissolve at least some dawsonite decomposition products. The dissolved dawsonite decomposition products are produced from the formation.
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: July 7, 2009
    Assignee: Shell Oil Company
    Inventor: Harold J. Vinegar
  • Publication number: 20090022640
    Abstract: There is provided a process for preparing aluminium chloride comprising leaching aluminium dross residues with H2SO4 so as to obtain a leachate; and hydrochlorinating the leachate so as to obtain aluminium chloride. If desired, aluminium chloride can then be converted into alumina.
    Type: Application
    Filed: November 16, 2007
    Publication date: January 22, 2009
    Applicant: GROUPE CONSEIL PROCD, INC.
    Inventors: Martin BEAULIEU, Stephane CHABOT, Yves CHAREST, Jean-Francois SAVARD
  • Publication number: 20080286182
    Abstract: THE COMBINED LEACHING PROCESS comprises a dissolution process of the soluble constituents of an ore by means of the combined execution of two or more serial leaching phases with the first phase comprising atmospheric leaching (AL) and the second one pressure leaching (HPAL). This combined process takes place when the intermediate size fraction (0.075-0.5 mm) is submitted to atmospheric leaching (AL), ensuing an effluent with a high concentration of dissolved iron and aluminum as well as high residual acidity. This said effluent is fed in the following acid pressure leaching (HPAL) phase of the fine size fraction (<0.075 mm) and at reusing free acidity, regenerating the sulfuric acid through iron and aluminum precipitation in a hydrolysis reaction, and bringing forth a considerable reduction in the addition of sulfuric acid.
    Type: Application
    Filed: February 7, 2006
    Publication date: November 20, 2008
    Applicant: COMPANHIA VALE DO RIO DOCE
    Inventors: Renato de Souza Costa, Flavia Dutra Mendes
  • Publication number: 20080159935
    Abstract: There is provided a process for preparing aluminium chloride comprising: leaching aluminium dross residues with HCl so as to obtain a mixture comprising a solid and a liquid; and hydrochlorinating the liquid obtained from the mixture, so as to form a precipitate comprising aluminium chloride. Such a sequence can also be used for preparing alumina. In such a case, the process can further comprise the step of converting the so-obtained aluminium chloride into alumina. In the processes previously defined, the solid so-obtained can also be leached with H2SO4, thereby generating a leachate. The leachate can also eventually be hydrochlorinated so as to increase the yield of the desired product obtained i.e. alumina or aluminium chloride.
    Type: Application
    Filed: November 23, 2007
    Publication date: July 3, 2008
    Applicant: GROUPE CONSEIL PROCD, INC.
    Inventors: Martin BEAULIEU, Stephane CHABOT, Yves CHAREST, Jean-Francois SAVARD
  • Patent number: 7090809
    Abstract: A method for the production of inorganic aluminum substances and amorphous silica from aluminum oxide containing ores, comprising: (a) leaching of said ores with fluorosilicic acid to obtain aluminum fluosilicate solution; (b) filtering said leached solution from insoluble materials; and (c) washing said insoluble materials.
    Type: Grant
    Filed: December 27, 2001
    Date of Patent: August 15, 2006
    Assignee: ATI-Aluminum Technologies Israel Ltd.
    Inventors: Simcha Harel, Lev Shapira
  • Patent number: 6627165
    Abstract: A process for upgrading of titaniferous material containing silica, including pretreating the titaniferous material by alkaline leaching to precipitate the silica as an aluminosilicate which is amenable to further leaching. Subsequently, the pretreated titaniferous material is leached under acid conditions, causing the silica to enter solution under conditions such that the silica is not hydrolysed or precipitated as a silicate.
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: September 30, 2003
    Assignee: Technological Resources PTY LTD
    Inventors: Ross Alexander McClelland, Michael John Hollitt
  • Patent number: 6608001
    Abstract: A method for producing small spherical particles that are especially useful as catalysts and catalyst supports employed in chemical processes is disclosed. According to some embodiments, the method includes impregnating a porous support with a metal or metal oxide and dissolving the support to release spherical particles. In certain embodiments the support that is employed in the method comprises a number of spherical voids which determine the size of the spherical particles, and preferably have micrometer range diameters. One embodiment of an attrition resistant Fischer-Tropsch catalyst comprises a plurality of micrometer size spherical metal and/or metal oxide particles that are prepared according to the above-described method.
    Type: Grant
    Filed: September 14, 2001
    Date of Patent: August 19, 2003
    Assignee: ConocoPhillips Company
    Inventor: Joe D. Allison
  • Patent number: 6596252
    Abstract: A process is described for the treatment of spent pot lining material from electrolyte reduction cells, this spent material having a substantial content of cryolite. The spent material is first leached with water at a dilution and a time sufficient to dissolve substantially all water soluble fluorides, after which the solid residue is separated from the liquid. The solid residue obtained is then subjected to a caustic leach with an aqueous sodium hydroxide solution containing about 20 to 50 g/L of NaOH and thereafter the solid residue is separated from the liquid.
    Type: Grant
    Filed: December 8, 2000
    Date of Patent: July 22, 2003
    Assignee: Alcan International Limited
    Inventors: Vijaya Kasireddy, Jean-Luc Bernier, Frank M. Kimmerle
  • Patent number: 6576204
    Abstract: A process for the production of alumina is performed by dissolving gibbsite Al2O3.3H2O in nitric acid to provide an acid solution containing aluminum nitrate; decomposing the acid solution at 300-700° C. with a free air supply to form alumina and Nox by spraying onto the inner surface of one or more rotary kilns, drying in a fluid bed, or drying in a steel belt conveyor furnace; regenerating the formed NOx into concentrated nitric acid and recycling the nitric acid to be used for the dissolving of gibbsite; and recovering the alumina formed upon decomposing the acid solution.
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: June 10, 2003
    Assignee: Haldor Topsoe A/S
    Inventor: Keld Johansen
  • Patent number: 6468483
    Abstract: A method for processing alumina-bearing ores such as bauxite to recover iron, aluminum, silicon and titanium metal values therefrom the method comprising the steps of adding the alumina-bearing ores to a digester containing an acid to provide a mixture of acid and alumina-bearing ores and heating the mixture to dissolve soluble compounds of at least one of iron, aluminum, silicon and titanium to provide a digest containing dissolved salts of the soluble compounds and to provide a gas component. Thereafter, the digest is treated with water to dissolve water soluble salts therein to provide a slurry comprised of a liquid containing water and the dissolved soluble salts and a solid component comprised of silica. The solid component is separated from the liquid and the pH of the liquid is adjusted to form an aluminate and an iron-containing precipitate.
    Type: Grant
    Filed: May 3, 2001
    Date of Patent: October 22, 2002
    Assignee: Goldendale Aluminum Company
    Inventors: Robert J. Barnett, Michael B. Mezner
  • Patent number: 6451273
    Abstract: A method of extracting active mineral liquid from a rock such as granite is described. This method comprises charging an extraction vessel with finely divided granite at ambient temperature and pressure; introducing an aqueous ammonia solution with agitating and then diluted sulfuric acid into the vessel; introducing 98% ethyl alcohol at below 80° C. into the vessel to elevate the inner pressure of the vessel to 2-3 kg/cm2 for facilitating the formation of complexes; and agitating the resulting reaction mixture for 20-160 minutes at 80° C. to 85° C. while maintaining the internal pressure of the vessel. The active mineral liquid is advantageously used as a mineral source for soils, animals, plants, the human body and so forth, and as an agent for the purification of waterworks as well as for the treatment of wastewater.
    Type: Grant
    Filed: December 15, 2000
    Date of Patent: September 17, 2002
    Inventors: Dae-Kyu Jung, Kyu-Heon Lee
  • Patent number: 6447738
    Abstract: A process for the extraction of alumina, iron oxide and titanium dioxide from bauxite ore and clays, and other ore bodies and feedstocks. The process starts by sulfuric acid leaching of the feedstocks in pressure autoclaves at about 200° C. and appropriate pressure. A leach liquor of sulfate salts of aluminum, iron and titanium is obtained. Any iron values are converted to a ferrous state. A recycled potassium sulfate helps produce double aluminum alkali sulfate crystals in the reduced leach liquor. The crystals are removed at about 20°-60° C. with the help of SO2 gases that reduce the ferric. Such double salt is hydrolyzed into a basic aluminum alkali precipitated sulfate salt. This is then dried and calcined at about 950° C. Any alkali sulfate is washed out and recycled. The remainder is alumina. The ferrous sulfate is crystallized out at about 10° C. It is dried and calcined at about 450° C. to produce an iron oxide mixed with other sulfate salts that can be washed out and recycled.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: September 10, 2002
    Assignee: Solv-Ex Corporation
    Inventors: John S. Rendall, Massoud Ahghar, Jerry V. Fox, Fred A. Aiken
  • Patent number: 6284207
    Abstract: A material with high surface area can be obtained through the partial or total removal of CaO and MgO by acid leaching of blast furnace slag. This is accomplished by an improved process for selective leaching of blast furnace slag and other solid solution materials by control of temperature during leaching, rate of addition of acid, type of the acid, concentration of the acid, and concentration of the slag in the slurry. When these variables are controlled as disclosed a hierarchy of dissolution occurs. The hierarchy begins with MgO, progresses to CaO, and is followed by A12O3, and the rate of acid addition is slow and controlled so that alumina does not dissolve (thereby depriving the remaining silica has no acid sites or catalytic activity). By invoking the hierarchy one gains selectivity, and this can be used to convert blast furnace slag to a material with high surface area which may have applications as an absorbent could be economically feasible.
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: September 4, 2001
    Inventor: John R. McCauley
  • Patent number: 6248302
    Abstract: A method for processing red mud to recover iron, aluminum, silicon and titanium metal values therefrom the method comprising the steps of adding the red mud to a digester containing an acid to provide a mixture of acid and red mud and heating the mixture to dissolve soluble compounds of at least one of iron, aluminum, silicon and titanium to provide a digest containing dissolved salts of the soluble compounds and to provide a gas component. Thereafter, the digest is treated with water to dissolve water soluble salts therein to provide a slurry comprised of a liquid containing water and the dissolved soluble salts and a solid component comprised of silica. The solid component is separated from the liquid and the pH of the liquid is adjusted to form an aluminate and an iron-containing precipitate.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: June 19, 2001
    Assignee: Goldendale Aluminum Company
    Inventors: Robert J. Barnett, Michael B. Mezner
  • Patent number: 6231822
    Abstract: A method of recovering chloride and sulfate salts from spent potliner using acid digestion.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: May 15, 2001
    Assignee: Goldendale Aluminum Company
    Inventors: Robert J. Barnett, Michael B. Mezner
  • Patent number: 6217836
    Abstract: Spent potliner from aluminum reduction cells is treated, for example, with sulfuric acid to recover carbon, silica and alumina or to recover a vitrified product of silca and alumina.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: April 17, 2001
    Assignee: Goldendale Aluminum Company
    Inventors: Robert J. Barnett, Michael B. Mezner
  • Patent number: 6217840
    Abstract: A method for producing fumed silica and a fluorine-containing product from a source of silica in solid form and a solid material containing fluorine, the solid material selected from the group consisting of sodium aluminum tetrafluoride, cryolite, aluminum fluosilicate ammonium bifluoride, sodium aluminum silicofluoride, and sodium fluosilicate. The method comprises the steps of digesting the silica in solid form and the solid material selected from the group consisting of sodium aluminum tetrafluoride, cryolite, aluminum fluosilicate, ammonium bifluoride, sodium aluminum silicofluoride, and sodium flurosilicate in a sulfuric acid digester. The digestion step produces a first gas component comprised of silicon tetrafluoride, hydrogen fluoride and water vapor. The first gas component is removed from the digester.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: April 17, 2001
    Assignee: Goldendale Aluminum Company
    Inventors: Robert J. Barnett, Michael B. Mezner
  • Patent number: 6193944
    Abstract: Spent potliner from an aluminum reduction cell is subject to an acid digest and the digest may be adjusted to produce a first gas component comprised of at least one material selected from the group consisting of silicon tetrafluoride, hydrogen fluoride, hydrogen cyanide gas and water vapor, and a slurry component comprised of at least one material selected from the group consisting of carbon, silica, alumina, and sodium, iron, calcium and magnesium compounds. The first gas component is removed from the digester and heated to a temperature sufficiently high to convert said silicon tetrafluoride to fumed silica and hydrogen fluoride. Thereafter, the fumed silica is separated from the hydrogen fluoride to recover fumed silica from spent potliner material.
    Type: Grant
    Filed: April 22, 1999
    Date of Patent: February 27, 2001
    Assignee: Goldendale Aluminum Company
    Inventors: Robert J. Barnett, Michael B. Mezner
  • Patent number: 6187275
    Abstract: A method of recovering AlF3 from spent potliner using an acid digest to form gaseous HF which is converted to hydrofluoric acid and reacted with alumina trihydrate to form AlF3.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: February 13, 2001
    Assignee: Goldendale Aluminum Company
    Inventors: Robert J. Barnett, Michael B. Mezner
  • Patent number: 6153157
    Abstract: A process which allows the conversion of clay minerals of the kalonite group, to a relatively pure form of alumina and silica respectively comprising the steps of (a) heating the kaolinite group minerals to greater than 500.degree. C., which causes dehydroxylation of the crystallographic lattice and formation of an intermediate meta-kaolin; (b) reacting the intermediate with only one of a selection of reagents including acids, alkalines or metalliferous compounds followed by heating of the mixture to form an aluminium salt in solution and residue of silica; (c) separation of the aluminium salt solution from the residue of silica by filtration and further treatment of the silica residue to produce a relatively pure form of fine particled silica; (d) formation of an alum by addition of ammonium sulphate in solution to the aluminium salt solution and further treatment of the alum to produce a relatively pure form of aluminium hydroxide.
    Type: Grant
    Filed: December 31, 1998
    Date of Patent: November 28, 2000
    Assignee: McLaughlin Geosurveys Pty. Limited
    Inventor: Robert Joseph McLaughlin
  • Patent number: 6123908
    Abstract: A process of treating spent potliner material from aluminum reduction cells and recovering useful products. In the process of the present invention, spent potliner material is introduced into an acid digester containing, for example, sulfuric acid. As a result of this step, a gas component is produced which includes hydrogen fluoride, silicon tetrafluoride and hydrogen cyanide. Also, a slurry component is produced which includes carbon, a refractory material including silica, alumina, sodium compounds such as sodium sulfate, aluminum compounds such as aluminum sulfate, iron compounds such as iron sulfate, magnesium and calcium compounds such as magnesium and calcium sulfate. The slurry component remains in the digester after the gas component is removed. The gas component is recovered and heated an effective amount to convert or decompose the silicon tetrafluoride to fumed silica, hydrogen cyanide to a remaining gas component including CO.sub.2, H.sub.2 O, and nitrogen oxides, as well as HF gas.
    Type: Grant
    Filed: March 27, 1999
    Date of Patent: September 26, 2000
    Assignee: Goldendale Aluminum Company
    Inventors: Robert J. Barnett, Michael B. Mezner
  • Patent number: 6110433
    Abstract: The invention relates to a process for recovering metals from used nickel/hydride storage batteries, in which storage battery scrap has been mechanically comminuted and divided into at least a coarse fraction and a fine fraction capable of being treated separately from one another. The process comprises the steps of digesting and dissolving the fine fraction with a mixture of sulfuric acid and hydrogen peroxide, performing a double sulfate precipitation of the rare earths by raising the pH, performing a precipitation of the iron and of the aluminum by further raising the pH, performing a solvent extraction of other metals to separate nickel and cobalt which remain in the aqueous phase from the other metals which are extracted into the organic phase. Optionally, the nickel and the cobalt can be separated from each other and, if desired, the mixed-metal rare earth component which has been recovered can be melted together with cobalt and nickel alloy for the fabrication of new batteries.
    Type: Grant
    Filed: June 16, 1997
    Date of Patent: August 29, 2000
    Assignee: Varta Batterie Aktiengesellschaft
    Inventors: Klaus Kleinsorgen, Uwe Kohler, Alexander Bouvier, Andreas Folzer
  • Patent number: 6110434
    Abstract: A process for recovering one of alumina hydrate, magnesium hydroxide and magnesium aluminate spinel (MgAl.sub.2 O.sub.4) from aluminum dross wherein the dross is processed to a non-metallic product (NMP). The dross may contain fluxing salts which are removed in providing the NMP. The NMP may be derived from aluminum dross which does not contain fluxing salts sometimes referred to as white dross. The process comprises digesting the non-metallic product with an acid selected from the group consisting of sulfuric, hydrochloric, hydrofluoric and phosphoric acid or mixtures thereof to provide a slurry containing dissolved alumina, magnesia and a solid component, for example, containing magnesium aluminate spinel. Instead of an acid, a base such as sodium hydroxide may be used. The slurry is filtered to separate the solid component from the liquid containing dissolved constituents such as alumina and magnesia to recover the solid component.
    Type: Grant
    Filed: February 24, 1999
    Date of Patent: August 29, 2000
    Assignee: Alumitech of Cleveland, Inc.
    Inventors: John W. Pickens, Michael D. Waite
  • Patent number: 5997828
    Abstract: A process for extraction of alumina from ore bodies containing aluminum is disclosed. The process comprises the steps of acid leaching an aluminum bearing ore to produce a leach liquor that includes aluminum values and silicon values. Any ferrous sulfate in the leach liquor is oxidized with an oxidizing agent comprising ozone to ferric sulfate. The oxidized leach liquor is hydrolyzed at about 130.degree. C. to form a gel of ferric values which are then removed. Any ferric sulfate remaining in the leach liquor after hydrolyzing is reduced to ferrous sulfate. The reduced leach liquor is then hydrolyzed at 165-180.degree. C. to remove precipitated basic aluminum alkali sulfate. The basic aluminum alkali sulfate is then dried and calcined at around 950.degree. C. to produce alumina and alkali sulfate which releases any SO.sub.2 and any SO.sub.3. The alumina is washed to remove any alkali sulfate and the washed alumina is then agglomerated and dried.
    Type: Grant
    Filed: September 30, 1998
    Date of Patent: December 7, 1999
    Inventor: John S. Rendall
  • Patent number: 5993758
    Abstract: A process for the simultaneous recovery of substantially pure alumina and silica from an aluminosilicate. The process comprises the following steps: (i) heating the aluminosilicate with hydrated CaCl.sub.2 to obtain calcium-alumino-silicate and calcium-aluminate products, wherein the CaCl.sub.2 is substantially free of MgCl.sub.2 ; (ii) leaching the products with HCl to form a solution comprising AlCl.sub.3 and CaCl.sub.2, and insoluble silica; (iii) separating the insoluble silica from the solution; and (iv) crystallizing AlCl.sub.3 from the solution and recovering the alumina from the crystallized AlCl.sub.3. The process may further comprise the following steps: (v) substantially removing MgCl.sub.2 from the CaCl.sub.2 solution of step (iv); and (vi) recycling the CaCl.sub.2 solution for use in step (i).
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: November 30, 1999
    Assignee: Mashal Alumina Industries Ltd.
    Inventors: Shlomo Nehari, Chanoch Gorin, Israel J. Lin, deceased, Amos Berkovich