Ferric Oxide Patents (Class 423/633)
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Publication number: 20100285371Abstract: Disclosed is a separator comprising inorganic particle or aggregates thereof having a unique spectrum or color pattern according to a predetermined rule. Also, disclosed are an electrochemical device comprising the above separator and a method for identifying the origin or kind of the separator itself or the electrochemical device comprising the same by using the above separator. Further, disclosed is a method for manufacturing the aforementioned separator, the method comprising a step of forming a specific pattern by coating inorganic particles having a unique spectrum or color pattern on at least one area selected from the group consisting of a surface of a porous substrate and a porous part of the substrate.Type: ApplicationFiled: September 21, 2007Publication date: November 11, 2010Applicant: LG CHEM, LTD.Inventors: Sang-Young Lee, Dae-Jong Seo, Dong-Myung Kim, Seok-Koo Kim, Hyun-Min Jang
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Publication number: 20100279126Abstract: A method for production of ceramic slabs comprising a mixture of atomised ceramic powders and a mixture of alpha hematites.Type: ApplicationFiled: September 9, 2008Publication date: November 4, 2010Applicant: GRANITIFIANDRE SOCIETA' PER AZIONIInventor: Giovanni Pellicelli
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Patent number: 7811543Abstract: A method and apparatus for producing surface stabilized nanometer-sized particles includes the steps of mixing reactants, a surface-stabilizing surfactant, and a high boiling point liquid to form a mixture, continuously passing the mixture through an ultrasonic spray nozzle to form a mist of droplets of the mixture, injecting the mist directly into a furnace to cause a reaction between species of the mixture, and collecting the nanometer-sized products. The ultrasonic nozzle is positioned directly at one end of the heating furnace, preferably the top end, for travel of the droplets through the furnace. The continuous liquid-flow process, along with certain operating parameters, eliminates the need for dilution of the high boiling point liquid with a low boiling point solvent as in the prior art, significantly increases the yield, improves the quality of the product, and makes the process scalable.Type: GrantFiled: October 9, 2008Date of Patent: October 12, 2010Assignee: Irilliant, Inc.Inventors: Yuri T. Didenko, Yuhua Ni
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Publication number: 20100247423Abstract: The present invention relates to a goethite nanotube. Particularly, the present invention is directed to goethite nanotubes, which can be used as a catalyst relating to environment or a drug delivery system, and process for preparing the goethite nanotube, and process for preparing magnetite and hematite nanoparticles.Type: ApplicationFiled: October 24, 2008Publication date: September 30, 2010Applicant: SEOUL NATIONAL UNIVERSITY INDUSTRY FOUNDATIONInventors: Taeghwan Hyeon, Taekyung Yu
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Patent number: 7803347Abstract: 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: GrantFiled: July 1, 2005Date of Patent: September 28, 2010Assignee: Tohoku Techno Arch Co., Ltd.Inventor: Tadafumi Ajiri
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Patent number: 7799232Abstract: 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: GrantFiled: July 31, 2009Date of Patent: September 21, 2010Assignee: Mitsubishi Materials CorporationInventors: Hiroshi Hayashi, Hitoshi Takeuchi, Hajime Negishi, Shigeyuki Tsuzaki, Yoshio Aikawa, Ayako Mimoto, Shintaro Nakaya
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Patent number: 7794677Abstract: 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: GrantFiled: December 21, 2009Date of Patent: September 14, 2010Assignee: Air Liquide Canada, Inc.Inventors: Javier Jara, Sylvester Zuttah
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Publication number: 20100207061Abstract: 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: ApplicationFiled: July 11, 2008Publication date: August 19, 2010Inventor: Jong-Hoon Kim
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Patent number: 7754099Abstract: 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: GrantFiled: April 25, 2005Date of Patent: July 13, 2010Assignee: Mitsubishi Materials CorporationInventors: Hiroshi Hayashi, Hitoshi Takeuchi, Hajime Negishi, Shigeyuki Tsuzaki, Yoshio Aikawa, Ayako Mimoto, Shintaro Nakaya
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Patent number: 7604793Abstract: 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: GrantFiled: April 29, 2005Date of Patent: October 20, 2009Assignee: Metalox InternationalInventors: Darren Koningen, William J. Freund, David Bruce Dreisinger
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Publication number: 20090196820Abstract: 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: ApplicationFiled: February 4, 2009Publication date: August 6, 2009Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, NATIONAL INSTITUTE FOR MATERIALS SCIENCEInventors: Naoki Nakamura, Tetsuo Uchikoshi, Yoshio Sakka
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Patent number: 7566436Abstract: 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: GrantFiled: February 11, 2005Date of Patent: July 28, 2009Assignee: The University of NottinghamInventors: Edward Henry Lester, Barry James Azzopardi
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Publication number: 20090169470Abstract: 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: ApplicationFiled: December 23, 2008Publication date: July 2, 2009Applicant: TDK CorporationInventor: Mika KAWASE
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Publication number: 20090162274Abstract: 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: ApplicationFiled: December 18, 2008Publication date: June 25, 2009Applicant: DENSO CORPORATIONInventors: Hiroaki Yotou, Miho Itoh
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Publication number: 20090142522Abstract: 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: ApplicationFiled: October 12, 2004Publication date: June 4, 2009Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: A. Paul Alivisatos, Yadong Yin, Can Kerem Erdonmez
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Patent number: 7488464Abstract: 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: GrantFiled: July 28, 2004Date of Patent: February 10, 2009Assignee: EnviroScrub Technologies CorporationInventors: Charles F. Hammel, Richard M. Boren
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Patent number: 7482382Abstract: 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: GrantFiled: May 19, 2004Date of Patent: January 27, 2009Assignees: The Texas A&M University System, Kaneka CorporationInventors: Yuntao Li, Hung-Jue Sue, Riichi Nishimura, Nobuo Miyatake
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Publication number: 20080267852Abstract: 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: ApplicationFiled: November 29, 2006Publication date: October 30, 2008Applicant: EVONIK DEGUSSA GmbHInventors: Kai Schumacher, Stefan Fiedler, Roland Schilling, Ronald Ihmig, Stipan Katusic
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Patent number: 7425234Abstract: 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: GrantFiled: March 4, 2004Date of Patent: September 16, 2008Assignee: LANXESS Deutschland GmbHInventors: Leslaw Mleczko, Ulrich Meisen, Georg Lamp, Ralph Weber
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Publication number: 20080206127Abstract: 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: ApplicationFiled: April 29, 2005Publication date: August 28, 2008Applicant: METALOX INTERNATIONALInventors: Darren Koningen, William J. Freund, David Bruce Dreisinger
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Patent number: 7410625Abstract: 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: GrantFiled: August 29, 2006Date of Patent: August 12, 2008Assignee: International Business Machines CorporationInventor: Shouheng Sun
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Publication number: 20080152583Abstract: The invention relates to a process for producing nanoparticulate solids by means of a Péclet number-stabilized gas-phase reaction.Type: ApplicationFiled: January 24, 2006Publication date: June 26, 2008Applicant: Basf AktiengesellschaftInventors: Frank Kleine Jager, Julian Prolss
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Patent number: 7387671Abstract: 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: GrantFiled: March 4, 2004Date of Patent: June 17, 2008Assignee: LANXESS Deutschland GmbHInventors: Ulrich Meisen, Leslaw Mleczko
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Patent number: 7347893Abstract: 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: GrantFiled: June 2, 2006Date of Patent: March 25, 2008Assignee: IOP Specialists SDN. BHD.Inventor: Kin Onn Low
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Publication number: 20080067469Abstract: 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: ApplicationFiled: June 27, 2005Publication date: March 20, 2008Applicant: JOMA CHEMICAL ASInventors: Aharon Eyal, Asher Vitner
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Publication number: 20070277703Abstract: 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: ApplicationFiled: June 2, 2006Publication date: December 6, 2007Applicant: IOP Specialists Sdn. Bhd.Inventor: Kin Onn Low
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Publication number: 20070266900Abstract: 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: ApplicationFiled: May 1, 2007Publication date: November 22, 2007Inventor: Holger Friedrich
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Patent number: 7294319Abstract: 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: GrantFiled: December 3, 2002Date of Patent: November 13, 2007Assignee: Outotec OyjInventors: Marko Lahtinen, Leena Lehtinen, Heikki Takala
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Patent number: 7267777Abstract: 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: GrantFiled: June 11, 2003Date of Patent: September 11, 2007Assignee: Veracon Metal Ltd.Inventors: Pavel Koren, Igal Raz, Robert Asimov, Rami Noach, Irena Trounkovsky
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Patent number: 7235127Abstract: 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: GrantFiled: December 13, 2005Date of Patent: June 26, 2007Assignee: LANXESS Deutschland GmbHInventors: Herbert Kunstmann, Udo Kräuter, Carsten Rosenhahn, Hans-Josef Moringen
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Patent number: 7220360Abstract: 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: GrantFiled: June 14, 2004Date of Patent: May 22, 2007Assignee: National Cheng Kung UniversityInventors: Hung-Ta Chen, Min-Shing Tsai, Juu-En Chang, Tsair-Fuh Lin, Ting-Che Hsiao, Jun-Yi Wu, You-Shen Chen
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Patent number: 7217400Abstract: 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: GrantFiled: August 18, 2003Date of Patent: May 15, 2007Assignee: Albemarle Netherlands B.V.Inventors: Edgar Evert Steenwinkel, Johannes Petrus Jozef Verlaan, Marieke Paulyne Renate Spee, Erik Jeroen Laheij, Paul O'Connor, Dennis Stamires
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Patent number: 7208134Abstract: 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: GrantFiled: December 20, 2004Date of Patent: April 24, 2007Assignee: Massachusetts Institute of TechnologyInventors: Lev E. Bromberg, T. Alan Hatton, Daniel I. C. Wang, Jin Yin, Bernat Olle
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Patent number: 7186395Abstract: Iron oxides are upgraded by calcining at from 700 to 1200° C.Type: GrantFiled: April 3, 2002Date of Patent: March 6, 2007Assignee: BASF AktiengesellschaftInventors: Christian Walsdorff, Michael Bajer, Reinhard Körner, Klaus Harth, Gerald Vorberg, Wilhelm Ruppel
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Patent number: 7182929Abstract: 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: GrantFiled: August 18, 2004Date of Patent: February 27, 2007Assignee: NEI, Inc.Inventors: Amit Singhal, Ganesh Skandan, Mohit Jain
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Patent number: 7163667Abstract: 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: GrantFiled: January 17, 2003Date of Patent: January 16, 2007Assignee: Sanyo Electric Co., Ltd.Inventors: Takashi Umemoto, Hideki Yoshikawa, Keiichi Kuramoto, Hitoshi Hirano
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Patent number: 7144561Abstract: 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: GrantFiled: July 8, 2003Date of Patent: December 5, 2006Assignee: Sachtleben Chemie GmbHInventor: Bodo Gosch
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Patent number: 7135161Abstract: 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: GrantFiled: September 4, 2003Date of Patent: November 14, 2006Assignee: University of Florida Research Foundation, Inc.Inventors: Paul H. Holloway, Mostafa Abboudi
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Patent number: 7122168Abstract: 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 hType: GrantFiled: October 1, 2003Date of Patent: October 17, 2006Assignee: Korea Institute of Science and TechnologyInventors: Kyoungja Woo, Jae-Pyoung Ahn, Hae-Weon Lee
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Patent number: 7105144Abstract: 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: GrantFiled: July 7, 2004Date of Patent: September 12, 2006Assignee: Yazaki CorporationInventor: Takayuki Kato
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Patent number: 6908600Abstract: 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: GrantFiled: November 25, 2002Date of Patent: June 21, 2005Inventors: Franco Ambri, Filippo Ranuzzi
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Patent number: 6863877Abstract: 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: GrantFiled: July 17, 2001Date of Patent: March 8, 2005Assignee: BASF AktiengesellschaftInventors: Christian Walsdorff, Hermann Petersen, Klaus Harth, Michael Baier
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Patent number: 6849187Abstract: 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: GrantFiled: December 10, 2002Date of Patent: February 1, 2005Assignee: Engelhard CorporationInventor: Thomas J. Shaniuk
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Publication number: 20040253175Abstract: 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: ApplicationFiled: August 21, 2002Publication date: December 16, 2004Inventor: Donald R. Stiffler
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Patent number: 6818052Abstract: 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: GrantFiled: June 27, 2002Date of Patent: November 16, 2004Assignee: Biopigment Ltd.Inventors: Vladimir Boiko, Marlen Oryol, Boris Oryol
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Publication number: 20040213731Abstract: 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: ApplicationFiled: December 19, 2003Publication date: October 28, 2004Inventors: Jun Xu, Gaurav Jain
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Publication number: 20040202606Abstract: 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: ApplicationFiled: April 30, 2004Publication date: October 14, 2004Applicant: SUD Chemie MT S.r.l.Inventors: Esterino Conca, Carlo Rubini, Guido Petrini
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Patent number: 6797240Abstract: 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: GrantFiled: January 8, 2001Date of Patent: September 28, 2004Assignee: Andritz AGInventor: Albert Lebl
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Patent number: 6790274Abstract: 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: GrantFiled: March 12, 2003Date of Patent: September 14, 2004Assignee: SUD Ehemie MT S.r.L.Inventors: Esterino Conca, Carlo Rubini, Guido Petrini
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Patent number: 6780393Abstract: 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: GrantFiled: December 14, 2001Date of Patent: August 24, 2004Assignees: National Institute of Advanced Industrial Science and Technology, Noritake Co., LimitedInventors: Norimitsu Murayama, Woosuck Shin, Sumihito Sago, Makiko Hayashi