Ferric Oxide Patents (Class 423/633)
  • Patent number: 7803347
    Abstract: A technique for bonding an organic group with the surface of fine particles such as nanoparticles through strong linkage is provided, whereas such fine particles are attracting attention as materials essential for development of high-tech products because of various unique excellent characteristics and functions thereof. Organically modified metal oxide fine particles can be obtained by adapting high-temperature, high-pressure water as a reaction field to bond an organic matter with the surface of metal oxide fine particles through strong linkage. The use of the same condition enables not only the formation of metal oxide fine particles but also the organic modification of the formed fine particles. The resulting organically modified metal oxide fine particles exhibit excellent properties, characteristics and functions.
    Type: Grant
    Filed: July 1, 2005
    Date of Patent: September 28, 2010
    Assignee: Tohoku Techno Arch Co., Ltd.
    Inventor: Tadafumi Ajiri
  • Patent number: 7799232
    Abstract: A reducing water purification material having a reducing iron-based precipitate selected from green rust, iron ferrite, reducing iron hydroxide, and a mixture thereof. A wastewater treatment process having steps of adding a reducing iron compound to wastewater, leading the wastewater to which the reducing iron compound is added to a reaction tank and forming a precipitate, separating the formed precipitate by a solid-liquid separation to obtain a sludge, and alkalinizing all or a portion of the separated sludge to form an alkaline sludge followed by returning to the reaction tank, wherein in the precipitation step, the wastewater to which the reducing iron compound is added and the alkaline sludge are mixed and are allowed to react in a non-oxidizing atmosphere under alkaline condition to form a reducing iron compound precipitate as the precipitate, thereby incorporating contaminants in the precipitate to remove the contaminants from the wastewater.
    Type: Grant
    Filed: July 31, 2009
    Date of Patent: September 21, 2010
    Assignee: Mitsubishi Materials Corporation
    Inventors: Hiroshi Hayashi, Hitoshi Takeuchi, Hajime Negishi, Shigeyuki Tsuzaki, Yoshio Aikawa, Ayako Mimoto, Shintaro Nakaya
  • Patent number: 7794677
    Abstract: Methods and systems for removing copper minerals from a molybdenite concentrate. One embodiment provides leaching copper from the molybdenite concentrate with a leaching solution comprising ferric chloride, removing molybdenite from the leaching solution, introducing an acid into the leaching solution and introducing O2, O3, or a combination of both, into the leaching solution. A method for regenerating ferric chloride in a leaching solution is also provided. One embodiment provides adding a leaching solution comprising Fe(II) ions, Fe(III) ions, or a combination of both, to a mixture of mineral sulfides, introducing an acid into the leaching solution, and introducing O2, O3, or a combination of both, into the leaching solution.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: September 14, 2010
    Assignee: Air Liquide Canada, Inc.
    Inventors: Javier Jara, Sylvester Zuttah
  • Publication number: 20100207061
    Abstract: The present invention relates to a preparation method of metal oxide, and more specifically to a preparation method of metal oxide comprising the steps of: a) dissolving metal halide in a solvent; b) adding and reacting water or metal hydroxide having strong basicity; c) adding base to the reaction solution and then raising a temperature thereof to form the metal oxide-carbon complex; d) stopping the reaction by inputting a large amount of water or metal hydroxide and raising the temperature thereof; and e) obtaining the metal oxide-carbon complex by a separation and a cleaning.
    Type: Application
    Filed: July 11, 2008
    Publication date: August 19, 2010
    Inventor: Jong-Hoon Kim
  • Patent number: 7754099
    Abstract: A reducing water purification material having a reducing iron-based precipitate selected from green rust, iron ferrite, reducing iron hydroxide, and a mixture thereof. A wastewater treatment process having steps of adding a reducing iron compound to wastewater, leading the wastewater to which the reducing iron compound is added to a reaction tank and forming a precipitate, separating the formed precipitate by a solid-liquid separation to obtain a sludge, and alkalinizing all or a portion of the separated sludge to form an alkaline sludge followed by returning to the reaction tank, wherein in the precipitation step, the wastewater to which the reducing iron compound is added and the alkaline sludge are mixed and are allowed to react in a non-oxidizing atmosphere under alkaline condition to form a reducing iron compound precipitate as the precipitate, thereby incorporating contaminants in the precipitate to remove the contaminants from the wastewater.
    Type: Grant
    Filed: April 25, 2005
    Date of Patent: July 13, 2010
    Assignee: Mitsubishi Materials Corporation
    Inventors: Hiroshi Hayashi, Hitoshi Takeuchi, Hajime Negishi, Shigeyuki Tsuzaki, Yoshio Aikawa, Ayako Mimoto, Shintaro Nakaya
  • Patent number: 7604793
    Abstract: Improved methods for treating metallurgical compositions involve reacting a metallurgical composition with an aqueous nitric acid solution. The reaction is performed at a pressure or at least about 220 psig and at a temperature of at least 100° C. The metallurgical composition comprises iron and one or more non-ferrous metals. The reaction dissolves at least a portion of the non-ferrous metal compositions into the solution which is in contact with solid ferric oxide. The reaction can be repeated on the isolated solids to increase the purity of ferric oxide in the solids. Zinc can be removed from mixed metal solutions obtained from furnace dust by adding base to precipitate zinc hydroxide.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: October 20, 2009
    Assignee: Metalox International
    Inventors: Darren Koningen, William J. Freund, David Bruce Dreisinger
  • Publication number: 20090196820
    Abstract: A process for producing an anisotropic magnetic material includes: preparing a feebly magnetic material capable of transforming into a magnetic material by a prescribed reaction, orienting the feebly magnetic material by imparting an external field to the feebly magnetic material, and transforming the oriented feebly magnetic material to a magnetic substance by the prescribed reaction.
    Type: Application
    Filed: February 4, 2009
    Publication date: August 6, 2009
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Naoki Nakamura, Tetsuo Uchikoshi, Yoshio Sakka
  • Patent number: 7566436
    Abstract: A mixing reactor for mixing efficiently streams of fluids of differing densities. In a preferred embodiment, one of the fluids is supercritical water, and the other is an aqueous salt solution. Thus, the reactor enables the production of metal oxide nanoparticles as a continuous process, without any risk of the reactor blocking due to the inefficient mixing inherent in existing reactor designs.
    Type: Grant
    Filed: February 11, 2005
    Date of Patent: July 28, 2009
    Assignee: The University of Nottingham
    Inventors: Edward Henry Lester, Barry James Azzopardi
  • Publication number: 20090169470
    Abstract: The process for production of iron oxyhydroxide particles according to the invention is characterized by comprising a step (A) in which a suspension containing iron(II) is prepared, and a step (B) in which fine bubbles with diameters of 0.05-500 ?m are generated in the suspension to form a reaction mixture, and the iron(II) in the reaction mixture is oxidized by the bubbles to produce iron oxyhydroxide particles.
    Type: Application
    Filed: December 23, 2008
    Publication date: July 2, 2009
    Applicant: TDK Corporation
    Inventor: Mika KAWASE
  • Publication number: 20090162274
    Abstract: A method for preparing metal oxide particles having a primary particle size on the order of nanometers is provided. The method comprises subjecting a metal ion present in an aqueous solution and an amino alcohol to an initial stage of reaction with each other at normal temperatures under normal pressures for a given time, and adding at least once either of a metal ion or an amino alcohol or both thereof to the resulting reaction system for carrying out a subsequent stage of reaction for a given time wherein total amounts of the metal ion and the amino alcohol are such that the amino alcohol is used in the range of not less than a molar equivalent to the metal ion.
    Type: Application
    Filed: December 18, 2008
    Publication date: June 25, 2009
    Applicant: DENSO CORPORATION
    Inventors: Hiroaki Yotou, Miho Itoh
  • Publication number: 20090142522
    Abstract: Described herein are hollow nanocrystals having various shapes that can be produced by a simple chemical process. The hollow nanocrystals described herein may have a shell as thin as 0.5 nm and outside diameters that can be controlled by the process of making.
    Type: Application
    Filed: October 12, 2004
    Publication date: June 4, 2009
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: A. Paul Alivisatos, Yadong Yin, Can Kerem Erdonmez
  • Patent number: 7488464
    Abstract: Methods and systems for processing metal oxides from metal containing solutions. Metal containing solutions are mixed with heated aqueous oxidizing solutions and processed in a continuous process reactor or batch processing system. Combinations of temperature, pressure, molarity, Eh value, and pH value of the mixed solution are monitored and adjusted so as to maintain solution conditions within a desired stability area during processing. This results in metal oxides having high or increased pollutant loading capacities and/or oxidation states. These metal oxides may be processed according to the invention to produce co-precipitated oxides of two or more metals, metal oxides incorporating foreign cations, metal oxides precipitated on active and inactive substrates, or combinations of any or all of these forms.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: February 10, 2009
    Assignee: EnviroScrub Technologies Corporation
    Inventors: Charles F. Hammel, Richard M. Boren
  • Patent number: 7482382
    Abstract: The present invention is directed to novel sol-gel methods in which metal oxide precursor and an alcohol-based solution are mixed to form a reaction mixture that is then allowed to react to produce nanosized metal oxide particles. The methods of the present invention are more suitable for preparing nanosized metal oxide than are previously-described sol-gel methods. The present invention can provide for nanosized metal oxide particles more efficiently than the previously-described sol-gel methods by permitting higher concentrations of metal oxide precursor to be employed in the reaction mixture. The foregoing is provided by careful control of the pH conditions during synthesis and by ensuring that the pH is maintained at a value of about 7 or higher.
    Type: Grant
    Filed: May 19, 2004
    Date of Patent: January 27, 2009
    Assignees: The Texas A&M University System, Kaneka Corporation
    Inventors: Yuntao Li, Hung-Jue Sue, Riichi Nishimura, Nobuo Miyatake
  • Publication number: 20080267852
    Abstract: Process for preparing pulverulent solids, in which one or more oxidizable and/or hydrolysable metal compounds are reacted in a high-temperature zone in the presence of oxygen and/or steam, the reaction mixture is cooled after the reaction, and the pulverulent solid is removed from gaseous substances, wherein at least one metal compound is introduced into the high-temperature zone in solid form and the evaporation temperature of the metal compound is below the temperature of the high-temperature zone.
    Type: Application
    Filed: November 29, 2006
    Publication date: October 30, 2008
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Kai Schumacher, Stefan Fiedler, Roland Schilling, Ronald Ihmig, Stipan Katusic
  • Patent number: 7425234
    Abstract: The invention relates to iron oxide pigments comprising an average solid body diameter of 0.1 to 500 ?m, and to the production and use thereof.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: September 16, 2008
    Assignee: LANXESS Deutschland GmbH
    Inventors: Leslaw Mleczko, Ulrich Meisen, Georg Lamp, Ralph Weber
  • Publication number: 20080206127
    Abstract: Improved methods for treating metallurgical compositions involve reacting a metallurgical composition with an aqueous nitric acid solution. The reaction is performed at a pressure or at least about 220 psig and at a temperature of at least 100° C. The metallurgical composition comprises iron and one or more non-ferrous metals. The reaction dissolves at least a portion of the non-ferrous metal compositions into the solution which is in contact with solid ferric oxide. The reaction can be repeated on the isolated solids to increase the purity of ferric oxide in the solids. Zinc can be removed from mixed metal solutions obtained from furnace dust by adding base to precipitate zinc hydroxide.
    Type: Application
    Filed: April 29, 2005
    Publication date: August 28, 2008
    Applicant: METALOX INTERNATIONAL
    Inventors: Darren Koningen, William J. Freund, David Bruce Dreisinger
  • Patent number: 7410625
    Abstract: A method and structure for making magnetite nanoparticle materials by mixing iron salt with alcohol, carboxylic acid and amine in an organic solvent and heating the mixture to 200-360° C. is described. The size of the particles can be controlled either by changing the iron salt to acid/amine ratio or by coating small nanoparticles with more iron oxide. Magnetite nanoparticles in the size ranging from 2 nm to 20 nm with a narrow size distribution are obtained with the invention.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: August 12, 2008
    Assignee: International Business Machines Corporation
    Inventor: Shouheng Sun
  • Publication number: 20080152583
    Abstract: The invention relates to a process for producing nanoparticulate solids by means of a Péclet number-stabilized gas-phase reaction.
    Type: Application
    Filed: January 24, 2006
    Publication date: June 26, 2008
    Applicant: Basf Aktiengesellschaft
    Inventors: Frank Kleine Jager, Julian Prolss
  • Patent number: 7387671
    Abstract: Iron Oxide pigment containing greater than 99% iron oxide, having a chloride content of less than 0.1% and a mean solid diameter of 10 to 500 ?m and methods of making the same are disclosed.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: June 17, 2008
    Assignee: LANXESS Deutschland GmbH
    Inventors: Ulrich Meisen, Leslaw Mleczko
  • Patent number: 7347893
    Abstract: The current invention relates to a method of manufacturing iron oxide pigments from mill scale. The mill scale is mixed with alien iron oxide and the resultant mixture is heated to a temperature of 200° C. to 900° C. in an oxidizing atmosphere to produce iron oxide pigment which can be black, brown or red. The alien iron oxide used and the iron oxide pigment produced are predominantly Fe2O3 or Fe3O4 or a mixture of both. The iron oxide pigment produced as above or from any other sources can be turn into black by mixing it with mill scale and the resultant mixture is heated to a temperature of 200° C. to 900° C. in a non-oxidizing or reducing atmosphere to produced iron oxide black pigment. Additives can be added to produce better quality iron oxide black pigment. The additives can be chromium oxide or manganese oxide or magnesium oxide or any carbonaceous material or mixtures thereof. The iron oxide black pigment produced as above is cooled in a non-oxidizing or reducing atmosphere to ensure no re-oxidation.
    Type: Grant
    Filed: June 2, 2006
    Date of Patent: March 25, 2008
    Assignee: IOP Specialists SDN. BHD.
    Inventor: Kin Onn Low
  • Publication number: 20080067469
    Abstract: The invention provides a method for the formation of small-size iron oxide particles comprising the steps of preparing a starting aqueous solution comprising at least one of ferric ions and complexes thereof, at a concentration of at least 0.1% W/W iron and a pH greater than about 1.5; maintaining said solution at a temperature lower than 55° C. for a retention time in which hydrolysis takes place, the extent of said hydrolysis being insufficient to decrease the pH by at least 0.2 units, wherein said time does not exceed 14 days, to form a system containing a modified solution; and adjusting the conditions in said system by at least one of the steps of heating the modified solution to elevate the temperature thereof by at least 10° C; elevating the pH of the modified solution by at least 0.3 units; and diluting the modified solution by at least 20%; whereby there are formed particles; wherein the majority of the particles formed are between about 2 nm and about 500 nm in size.
    Type: Application
    Filed: June 27, 2005
    Publication date: March 20, 2008
    Applicant: JOMA CHEMICAL AS
    Inventors: Aharon Eyal, Asher Vitner
  • Publication number: 20070277703
    Abstract: The current invention relates to a method of manufacturing iron oxide pigments from mill scale. The mill scale is mixed with alien iron oxide and the resultant mixture is heated to a temperature of 200° C. to 900° C. in an oxidizing atmosphere to produce iron oxide pigment which can be black, brown or red. The alien iron oxide used and the iron oxide pigment produced are predominantly Fe2O3 or Fe3O4 or a mixture of both. The iron oxide pigment produced as above or from any other sources can be turn into black by mixing it with mill scale and the resultant mixture is heated to a temperature of 200° C. to 900° C. in a non-oxidizing or reducing atmosphere to produced iron oxide black pigment. Additives can be added to produce better quality iron oxide black pigment. The additives can be chromium oxide or manganese oxide or magnesium oxide or any carbonaceous material or mixtures thereof. The iron oxide black pigment produced as above is cooled in a non-oxidizing or reducing atmosphere to ensure no re-oxidation.
    Type: Application
    Filed: June 2, 2006
    Publication date: December 6, 2007
    Applicant: IOP Specialists Sdn. Bhd.
    Inventor: Kin Onn Low
  • Publication number: 20070266900
    Abstract: The present invention relates to oxidation-stable iron oxide pigments which have a coating of at least one organic substance, to their preparation and to their use.
    Type: Application
    Filed: May 1, 2007
    Publication date: November 22, 2007
    Inventor: Holger Friedrich
  • Patent number: 7294319
    Abstract: This invention relates to a method for the removal of iron as hematite from a zinc sulphate solution in atmospheric conditions during the electrolytic preparation of zinc. According to the method, the pH of the iron-containing solution is adjusted to a value of at least 2.7, oxygen-containing gas is fed into the solution and part of the hematite thus formed is recirculated to the precipitation stage.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: November 13, 2007
    Assignee: Outotec Oyj
    Inventors: Marko Lahtinen, Leena Lehtinen, Heikki Takala
  • Patent number: 7267777
    Abstract: Method for removal of heavy metal ions from aqueous wastes, which are produced during electroplating and other industrial processes. The method comprises a precipitation process that is conducted in a magnetic field.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: September 11, 2007
    Assignee: Veracon Metal Ltd.
    Inventors: Pavel Koren, Igal Raz, Robert Asimov, Rami Noach, Irena Trounkovsky
  • Patent number: 7235127
    Abstract: The present invention relates to reduction- and oxidation-stable iron oxide black pigments having high color strength, the preparation thereof and the use thereof.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: June 26, 2007
    Assignee: LANXESS Deutschland GmbH
    Inventors: Herbert Kunstmann, Udo Kräuter, Carsten Rosenhahn, Hans-Josef Moringen
  • Patent number: 7220360
    Abstract: This invention offers an integrated technology in sequential treatment of wastewater. Low biodegradable organics and heavy metal ions are both contained in wastewater from surface finishing processes. The aim of the invention is to find the solution for treatment of organics and heavy metal ions in complicated wastewater that contains organics and heavy metal ions sequentially. Low biodegradable organics are oxidized by a fenton process with pH ranging from 2 to 5 and temperature ranging from 20° C. to 100° C. Heavy metal ions are then treated by a ferrite process with pH ranging from 8 to 12 and temperature ranging from 20° C. to 100° C. The integrated technology of the fenton process and the ferrite process (2FP) is advantageous to treat the wastewater from surface finishing processes, decrease the production of iron sludge caused in the fenton process and increase the quality of ferrite products.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: May 22, 2007
    Assignee: National Cheng Kung University
    Inventors: Hung-Ta Chen, Min-Shing Tsai, Juu-En Chang, Tsair-Fuh Lin, Ting-Che Hsiao, Jun-Yi Wu, You-Shen Chen
  • Patent number: 7217400
    Abstract: An apparatus and continuous process for the conversion of one solid iron compound to another solid iron compound in a heterogeneous suspension wherein the suspension is formed by dispersing a solid starting iron compound in a liquid that is continuously fed through one or more agitated conversion vessels under hydrothermal conditions and converted to a solid product iron compound having different physical, chemical, or structural properties from the solid starting iron compound.
    Type: Grant
    Filed: August 18, 2003
    Date of Patent: May 15, 2007
    Assignee: Albemarle Netherlands B.V.
    Inventors: Edgar Evert Steenwinkel, Johannes Petrus Jozef Verlaan, Marieke Paulyne Renate Spee, Erik Jeroen Laheij, Paul O'Connor, Dennis Stamires
  • Patent number: 7208134
    Abstract: One aspect of the present invention relates to magnetic nanoparticles colloidally stabilized in aqueous milieu by association with an organic phase. The organic phase may be either a fluorinated polymer or an organic hydrocarbon bilayer, wherein the two layers are chemically bonded to each other. The stabilized particles are further non-toxic and provide useful enhancements in bioprocesses. Another aspect of the present invention relates to compositions comprising an oxygen-dissolving fluid vehicle and surface modified, nanometer-sized magnetic particles. The inventive compositions have utility in a wide range of applications, but are particularly suitable for use as recyclable oxygen carriers, separation and purification vehicles, and bioprocessing media, including fermentation processes.
    Type: Grant
    Filed: December 20, 2004
    Date of Patent: April 24, 2007
    Assignee: Massachusetts Institute of Technology
    Inventors: Lev E. Bromberg, T. Alan Hatton, Daniel I. C. Wang, Jin Yin, Bernat Olle
  • Patent number: 7186395
    Abstract: Iron oxides are upgraded by calcining at from 700 to 1200° C.
    Type: Grant
    Filed: April 3, 2002
    Date of Patent: March 6, 2007
    Assignee: BASF Aktiengesellschaft
    Inventors: Christian Walsdorff, Michael Bajer, Reinhard Körner, Klaus Harth, Gerald Vorberg, Wilhelm Ruppel
  • Patent number: 7182929
    Abstract: A method for producing nanostructured multi-component or doped oxide particles and the particles produced therein. The process includes the steps of (i) dissolving salts of cations, which are either dopants or components of the final oxide, in an organic solvent; (ii) adding a dispersion of nanoparticles of a single component oxide to the liquid solution; (iii) heating the liquid solution to facilitate diffusion of cations into the nanoparticles; (iv) separating the solids from the liquid solution; and (v) heat treating the solids either to form the desired crystal structure in case of multi-component oxide or to render the homogeneous distribution of dopant cation in the host oxide structure. The process produces nanocrystalline multi-component or doped oxide nanoparticles with a particle size of 5–500 nm, more preferably 20–100 nm; the collection of particles have an average secondary (or aggregate) particle size is in the range of 25–2000 nm, preferably of less than 500 nm.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: February 27, 2007
    Assignee: NEI, Inc.
    Inventors: Amit Singhal, Ganesh Skandan, Mohit Jain
  • Patent number: 7163667
    Abstract: A production process for an oxide magnetic material comprising the steps of blending raw material powder so as to take the composition of a hexagonal ferrite including: at least one kind of an element A selected from the group consisting of Ba, Sr and Ca; Co and Cu; Fe; and O; and sintering said blended powder at a temperature lower than 1000° C.
    Type: Grant
    Filed: January 17, 2003
    Date of Patent: January 16, 2007
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Takashi Umemoto, Hideki Yoshikawa, Keiichi Kuramoto, Hitoshi Hirano
  • Patent number: 7144561
    Abstract: Described is a method for the manufacture of iron hydroxide, iron oxide hydrate or iron oxide from filter salts from thin acid recovery, in which the filter salts are dissolved in water, the solution is adjusted to a pH of <1, then a pH of 2 to 4 is established by the addition of a strong base, with stirring, the substances precipitating are separated in a known manner, the remanent solution is adjusted to a pH of 6 to 8 by the addition of a strong base, the precipitating iron hydroxide is separated from the solution, washed, dried, and, if desired, dried and/or calcined to form iron oxide.
    Type: Grant
    Filed: July 8, 2003
    Date of Patent: December 5, 2006
    Assignee: Sachtleben Chemie GmbH
    Inventor: Bodo Gosch
  • Patent number: 7135161
    Abstract: A method of forming metal oxide powders includes the steps of solid state mixing of at least one metal nitrate salt, such as Fe(NO3)3 or a combination of metal nitrate salts such as Zn(NO3)3,6H2O and Ga(NO3)3, xH2O, and at least one reducing organic acid, such as tartaric or citric acid. The mixture is heated to form a metal oxide powder, such as alpha-iron oxide (?-Fe2O3) or a mixed metal powder such as zinc gallate phosphor (ZnGa2O4). A metal oxide precursor intermediate can be formed and then heated to form the metal oxide powder.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: November 14, 2006
    Assignee: University of Florida Research Foundation, Inc.
    Inventors: Paul H. Holloway, Mostafa Abboudi
  • Patent number: 7122168
    Abstract: In a metal oxide nanoparticle and a synthetic method thereof, and in particular to maghemite (?-Fe2O3) nanoparticles usable as a superhigh density magnetic recording substance by having good shape anisotropy and magnetic characteristics, hematite (?-Fe2O3) nanoparticles usable as a precursor to the maghemite or a catalyst, maghemite and hematite-mixed nanoparticles and a synthetic method thereof, the method for synthesizing metal oxide nanoparticles includes forming a reverse micelle solution by adding distilled water, a surfactant and a solvent to metallic salt not less than trivalent, precipitating and separating gel type amorphous metal oxide particles by adding proton scavenger to the reverse micelle solution; adjusting a molar ratio of metal oxide to the surfactant by washing the gel type amorphous metal oxide particles with a polar solvent; and crystallizing metal oxide nanoparticles through heating or reflux after dispersing the gel type amorphous metal oxide particles in a non-polar solvent having a h
    Type: Grant
    Filed: October 1, 2003
    Date of Patent: October 17, 2006
    Assignee: Korea Institute of Science and Technology
    Inventors: Kyoungja Woo, Jae-Pyoung Ahn, Hae-Weon Lee
  • Patent number: 7105144
    Abstract: A method for producing ferrite hollow particles having a hollow structure formed by mutual sintering of ferrite powder, including: a) a step of mixing a resin powder and a ferrite powder of a particle size smaller than that of the resin powder under compaction thereby forming ferrite powder-coated particles in which ferrite powder coats, in a partially embedded state, surface of the resin powder; and b) a step of heat treating the obtained ferrite powder-coated particles thereby removing the resin powder and mutually sintering the ferrite powder.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: September 12, 2006
    Assignee: Yazaki Corporation
    Inventor: Takayuki Kato
  • Patent number: 6908600
    Abstract: A method for obtaining pigments for ceramic and glass, particularly for substrates and coatings, including a step of adding a solution of an iron salt to at least one silicon addition agent including silica in gel form.
    Type: Grant
    Filed: November 25, 2002
    Date of Patent: June 21, 2005
    Inventors: Franco Ambri, Filippo Ranuzzi
  • Patent number: 6863877
    Abstract: A process for removing chloride from chloridic iron oxide comprises mixing said chloridic iron oxide with an acid and subsequently conducting a thermal treatment at from 50 to 1300° C.
    Type: Grant
    Filed: July 17, 2001
    Date of Patent: March 8, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Christian Walsdorff, Hermann Petersen, Klaus Harth, Michael Baier
  • Patent number: 6849187
    Abstract: Disclosed is a heavy metal removal media containing ferric hydroxide having unique levels of microporosity and mesoporosity/macroporosity, and/or a specific average particle size and/or granule size. The ferric hydroxide is made by simultaneously combining in a vessel at least one iron salt and at least one hydroxide compound, and then recovering the ferric hydroxide. The ferric hydroxide made by simultaneous mixing is effective in removing heavy metals, such as arsenic, from aqueous systems.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: February 1, 2005
    Assignee: Engelhard Corporation
    Inventor: Thomas J. Shaniuk
  • Publication number: 20040253175
    Abstract: A milling apparatus is modified by electrically insulating the milling chamber to enhance the efficiency of tribochemical reactions between reactive compositions during milling. The enhanced level of tribochemical reactivity is attributed to the buildup of electrostatic charge in and on the milled chamber during mill operation. The insulated mills in accordance with the invention can be used in a wide variety of commercial applications generally involving tribomechanically induced redox chemistry, including ore extraction, precious metal extraction, production of ferrites and pigments, and waste processing.
    Type: Application
    Filed: August 21, 2002
    Publication date: December 16, 2004
    Inventor: Donald R. Stiffler
  • Patent number: 6818052
    Abstract: The invention provides a process for the production of iron based pigments and anticorrosive additives from elemental iron comprising: a) reacting iron Fe° with ferric sulphate Fe2(SO4)3 and with sulfuric acid H2SO4 to produce ferrous sulphate FeSO4; b) oxidizing ferrous sulphate FeSO4 in a bacterial solution containing at 107 bactrial cells of thiobacillus ferrooxidans per 1 ml of solution under aerobic conditions to produce ferric oxide sulphate Fe2(SO4)3; c) reacting said ferric oxide sulphate Fe2(SO4)3 with water, to precipitate iron oxide monohydrate Fe2O3×H2O; and d) re-cycling the solution from step c, to step a, to utilize the sulphuric acid and a portion of the ferruos sulphate values therein.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: November 16, 2004
    Assignee: Biopigment Ltd.
    Inventors: Vladimir Boiko, Marlen Oryol, Boris Oryol
  • Publication number: 20040213731
    Abstract: An iron oxide based host material capable of intercalating lithium ions includes nanostructured phases composed of at least substantially amorphous nanometer sized particles, and is applicable for use in the cathode electrode of a lithium rechargeable battery.
    Type: Application
    Filed: December 19, 2003
    Publication date: October 28, 2004
    Inventors: Jun Xu, Gaurav Jain
  • Publication number: 20040202606
    Abstract: Highly pure iron oxides are prepared by reaction of metallic iron, in the form of microspheroidal particles or of scraps or cuttings, with an agitated aqueous solution of a mono- or polycarboxylic acid with a pKa of 0.5 to 6 relative to the first carboxyl and capable of decomposing, by heating in air at 200 to 350° C., to carbon dioxide and water, using 0.03 to 1.5 moles of acid per g-atoms of iron, a water/iron weight ration of 1 to 20, and by oxidation of the ferrous carboxilate to ferric salt, with an agent selected from oxygen, mixtures containing oxygen, hydrogen peroxide, organic peroxides and hydroperoxides.
    Type: Application
    Filed: April 30, 2004
    Publication date: October 14, 2004
    Applicant: SUD Chemie MT S.r.l.
    Inventors: Esterino Conca, Carlo Rubini, Guido Petrini
  • Patent number: 6797240
    Abstract: Process and apparatus for regenerating spent acid liquor includes a primary roasting furnace for evaporating a substantial portion of the liquid from the spent acid to produce acid vapors and partially roasted metal salts. The partially roasted metal salts are transferred to a secondary roasting chamber where the acids adhering to the surface of the metal salts is vaporized and the metal salts are oxidized. The acid vapors from the primary roasting furnace are then transferred to an absorption column to regenerate the acid. The primary roasting furnace is operated at a different temperature from the secondary roasting chamber and has different retention times for the metal salts. The secondary roasting chamber includes a raking device to mix and convey the metal salts during the secondary roasting step to produce a uniformly roasted metal oxide.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: September 28, 2004
    Assignee: Andritz AG
    Inventor: Albert Lebl
  • Patent number: 6790274
    Abstract: Highly pure iron oxides are prepared by reaction of metallic iron, in the form of microspheroidal particles or of scraps or cuttings, with an agitated aqueous solution of a mono- or polycarboxylic acid with a pKa of 0.5 to 6 relative to the first carboxyl and capable of decomposing, by heating in air at 200 to 350° C., to carbon dioxide and water, using 0.03 to 1.5 moles of acid per g-atoms of iron, a water/iron weight ration of 1 to 20, and by oxidation of the ferrous carboxilate to ferric salt, with an agent selected from oxygen, mixtures containing oxygen, hydrogen peroxide, organic peroxides and hydroperoxides.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: September 14, 2004
    Assignee: SUD Ehemie MT S.r.L.
    Inventors: Esterino Conca, Carlo Rubini, Guido Petrini
  • Patent number: 6780393
    Abstract: A method of producing fine particles of an oxide of a metal, comprising the steps of: preparing an acidic solution which contains ions of the metal; precipitating fine particles of a hydroxide of the metal by adding an alkaline solution to the acidic solution; collecting the fine particles of the hydroxide of the metal precipitated in a mixed solution of the acidic solution and the alkaline solution; mixing fine particles of a carbon with the collected fine particles of the hydroxide of the metal; and heat-treating a mixture of the fine particles of the hydroxide of the metal and the fine particles of the carbon at a predetermined temperature in a non-reducing atmosphere, whereby the fine particles of the oxide of the metal are produced.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: August 24, 2004
    Assignees: National Institute of Advanced Industrial Science and Technology, Noritake Co., Limited
    Inventors: Norimitsu Murayama, Woosuck Shin, Sumihito Sago, Makiko Hayashi
  • Patent number: 6770773
    Abstract: The present invention relates to ferroxanes and a method of making wherein a ferroxane may be defined by the general formula [Fe(O)x(OH)y(O2CR)z]n wherein x, y and z may be any integer or fraction such that 2x+y+z=3 and n may be any integer. The ferroxanes may be doped with at least one other element other than iron. The present invention further relates to a ceramic made from the ferroxanes of the present invention and a method of making. The present invention still further relates to supported and unsupported membranes made from the ceramic of the present invention.
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: August 3, 2004
    Assignee: William Marsh Rice University
    Inventors: Jerome Rose, Mark Wiesner, Andrew Barron
  • Patent number: 6758894
    Abstract: A black pigment substantially free of objectionable transition metal materials is disclosed. This pigment is particularly useful for coloring glass since the absence of the transition metal gives it excellent recycling properties. The pigment is an alkaline earth (preferably strontium) iron maganese oxide material as specifically defined the in the present invention.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: July 6, 2004
    Assignee: The Shepherd Color Company
    Inventor: Joel D. Houmes
  • Patent number: 6716555
    Abstract: The positive active material for secondary battery according to the invention comprises O, Fe in an amount of higher than 25% by weight, and V in an amount of from higher than 0% by weight to less than 35% by weight. The positive active material, when it is free of lithium, exhibits the following main peaks by the X-ray diffractometry using CuK&agr; rays: a peak within a 2&thgr; range of from greater than 26° to less than 29° and a peak within a 2&thgr; range of from greater than 29° to less than 32°. The non-aqueous secondary battery having a positive electrode comprising this positive active material exhibits a high capacity and good cycle life performance and is inexpensive and environmentally friendly.
    Type: Grant
    Filed: June 12, 2001
    Date of Patent: April 6, 2004
    Assignee: Japan Storage Battery Co., Ltd.
    Inventor: Atsushi Funabiki
  • Patent number: 6692719
    Abstract: A process is disclosed for regenerating an aqueous acid halide leachant from a spent aqueous metal halide leach liquor. The process comprises introducing into a fluidized bed or spray roaster a hydrocarbon fuel, an oxygen-enriched oxidizing gas and the aqueous metal halide leach liquor; pyrohydrolyzing the aqueous metal halide leach liquor by combustion of the hydrocarbon fuel with the oxygen-enriched oxidizing gas to produce an acid halide-containing gas fraction and a metal oxide-containing solid fraction; separating the gas fraction from the solid fraction, recovering heat energy from the acid halide-containing gas fraction and absorbing the gas fraction in water to produce the aqueous acid halide leachant. The oxygen-enriched oxidizing gas has an oxygen concentration of greater than about 21 percent by volume, preferably greater than about 50 percent by volume, more preferably greater than about 80 percent by volume, and even more preferably greater than about 90 percent by volume.
    Type: Grant
    Filed: November 8, 2000
    Date of Patent: February 17, 2004
    Assignee: Hatch Ltd.
    Inventors: Bert Wasmund, Kamal Adham