Iron Containing Patents (Class 423/558)
  • Patent number: 9738542
    Abstract: The invention relates to a method for the further processing of iron sulfate heptahydrate into iron sulfate monohydrate. An aqueous solution or suspension of iron sulfate heptahydrate is formed and heated in a pressure vessel to a temperature above its boiling temperature at atmospheric pressure and where solid iron sulfate monohydrate and a solution are formed. The solid iron sulfate monohydrate is separated from the solution and fed into a pressure vessel at a temperature above the boiling temperature of the solution at the pressure in the pressure vessel, which is lower than the pressure during separation.
    Type: Grant
    Filed: December 3, 2015
    Date of Patent: August 22, 2017
    Assignee: Kronos International, Inc.
    Inventors: Thomas Pierau, Mitja Medved
  • Patent number: 9376329
    Abstract: A method oxidizes ferrous iron to ferric iron. The method includes providing a liquid, which includes the ferrous iron, and a gas, which includes an oxidizing agent, such as oxygen and/or chlorine; providing two separate mixes, with both mixes including the gas and the liquid; and colliding the separate mixes, thereby obtaining the ferric iron.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: June 28, 2016
    Assignee: Tessenderlo Chemie NV
    Inventors: Philippe Quénon, Rudy Peeters
  • Patent number: 8840931
    Abstract: The present invention provides a pharmaceutical composition for dehydrating, atrophying and eliminating pathological tissues comprising inorganic polymeric ferric salt and/or inorganic polymeric ferric salt composite as its active ingredients, in which the inorganic polymeric ferric salt is polyferric sulfate, and the inorganic polymeric ferric salt composite is selected from a group consisting of poly-silicate ferric salts, polyphosphate ferric salts and their analogue. A surprising medical effect can be reached by treating pathological tissues with the pharmaceutical composition of the present invention which will make the treated pathological tissues dehydrated, atrophied, and absorbed or sloughed off.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: September 23, 2014
    Inventors: Kuok Leong Tam, Io cheng Tam, Hio man Tam
  • Patent number: 8747803
    Abstract: A process of producing a less acidic ferrous sulfate includes the steps of placing iron shavings within a tank, introducing sulfuric acid and water into the tank, retaining the sulfuric acid and water and the iron shavings within the tank for a period of time so as to react the sulfuric acid and water and iron shavings in order to produce less acidic ferrous sulfate, and removing the less acidic ferrous sulfate from the tank. The iron shavings and the sulfuric acid and the water are reacted together in the tank for a period of time of between twelve and twenty-four hours. The less acidic ferrous sulfate is Fe(SO4)<1.0.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: June 10, 2014
    Inventor: Ronald L. Horne
  • Patent number: 8734739
    Abstract: A process for treating spent pickle liquor has the steps of mixing the spent pickle liquor with sulfuric acid, introducing oxygen into the mixture of spent pickle liquor and the sulfuric acid for a period of time, and producing diiron(II) tetrachlorosulfate from the oxygen-introduced mixture of sulfuric acid and spent pickle liquor. The spent pickle liquor and the sulfuric acid are introduced into a column. The oxygen is passed under pressure into the column. The intimate mixture of spent pickle liquor, sulfuric acid and oxygen are maintained under pressure for a period of time.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: May 27, 2014
    Inventor: Ronald L. Horne
  • Patent number: 8658124
    Abstract: A process for manufacturing ferric sulfate has the steps of introducing water into an interior of a pressure vessel, introducing an iron material into the interior of the pressure vessel, mixing the iron material and the water within the interior of the pressure vessel, adding sulfuric acid to the mixed iron material and water, agitating the iron material and the sulfuric acid and the water for a period of time so as to increase a temperature of a reaction and a pressure of the reaction within the interior of the pressure vessel, and discharging ferric sulfate from the interior of the pressure vessel. The iron material can be either hematite or magnetite. Oxygen can be introduced into the interior of the pressure vessel if the iron material is magnetite.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: February 25, 2014
    Inventor: Ronald L. Horne
  • Patent number: 8632746
    Abstract: A process for producing ferric sulfate has the steps of reacting iron and water and sulfuric acid within a digester so as to produce a blend of ferric sulfate and ferrous sulfate, forming a column having an interior volume and an upper end in which the column has inert random packing material therein, passing the blend of the ferric sulfate and ferrous sulfate to the upper end of the column, introducing oxygen into the column at the upper end of the column, intimately mixing the oxygen with the blend of ferric sulfate and ferrous sulfate by gravity flowing the oxygen and the blend of ferric sulfate and ferrous sulfate downwardly through said random packing material in said column, and discharging the ferric sulfate from the interior volume of the column.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: January 21, 2014
    Inventor: Ronald L. Horne
  • Patent number: 8523975
    Abstract: Salts of mineral nutrients stabilized with amino acids and/or ammonium salt, product and food supplement in which they are included and procedures of obtention, where the salts are obtained with anions of organic acids or inorganic anions and metallic cations associated with amino acids and/or ammonium salt, in which the invention introduces its general structure: {[Ac]n?·Men+?n[Amino acid and/or ammonium salt]}·xH2O Where ? represents a covalent dative bond, These new compounds have better taste and more solubility in water, making them more bioavailable.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: September 3, 2013
    Inventors: Eduardo Walter Ettlin, Jose Ruben Boccio, Adrian Tomas De Paoli, Edgardo Adrian Hager, Pablo Adrian De Paoli
  • Publication number: 20130052106
    Abstract: The invention provides a process for the production of ferrous sulphate monohydrate which comprises: (a) reacting a source of iron with an aqueous solution of sulphuric acid in at least a first reaction vessel, to obtain a process liquor comprising ferrous sulphate and acid solution; and then (b) combining the process liquor with concentrated sulphuric acid in a mixing vessel, causing the solution to self crystallize, thus forming a slurry comprising crystalline ferrous sulfate monohydrate. The slurry can, if desired, then be converted to ferric sulphate.
    Type: Application
    Filed: February 11, 2011
    Publication date: February 28, 2013
    Applicant: Tioxide Europe Limited
    Inventors: Kim William Gates, Simon Nicholas Roberts
  • Publication number: 20120316340
    Abstract: The use of metal-accumulating plants for implementing chemical reactions.
    Type: Application
    Filed: November 18, 2010
    Publication date: December 13, 2012
    Applicants: UNIVERSITE MONTPELLIER 2 SCIENCES ET TECHNIQUES, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Claude Grison, Jose Escarre
  • Publication number: 20120141407
    Abstract: Compositions for the use of sewage or wastewater treatment, controlling odors or a combination thereof are disclosed, wherein the composition comprises at least one iron-based compound. Furthermore, methods of reducing the odors in a sewage or wastewater system are disclosed that include: adding a composition comprising at least one iron-based compound to a sewage or wastewater system. As used herein, the phrase “at least one iron-based compound” includes ferrous chloride, ferric chloride, ferrous sulfate, ferrate, polyferric sulfate, Ferix-3 (Fe2(SO4)3H2O) or a combination thereof.
    Type: Application
    Filed: September 28, 2011
    Publication date: June 7, 2012
    Inventors: Carla Dillon, Brian Reed, Talebi Mahin
  • Patent number: 8128903
    Abstract: The invention relates to a method of controlling the solubility of granular material by treating a precipitate comprising iron(II)sulphate monohydrate originating from titanium dioxide production, in which method the reaction temperature is allowed to increase at the most to a temperature of 120° C., to a plant for treating a precipitate comprising iron(II)sulphate monohydrate, to a product and its uses. A typical method according to the invention comprises the steps of mixing water to the reaction mixture in the said mixing apparatus, and keeping the amount of neutralizing agent sufficient to give a pH value from 1.5 to 4, preferably from 1.5 to 3, to the end product in order to obtain a granular material having a high soluble iron(II) content or keeping the amount of neutralizing agent sufficient to give a pH value ?9 to the end product in order to obtain a granular material having a low solubility.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: March 6, 2012
    Assignee: Sachtleben Pigments Oy
    Inventors: Juhatuomas Vuorisalo, Joni Pärnänen
  • Publication number: 20120034316
    Abstract: The present invention provides a pharmaceutical composition for dehydrating, atrophying and eliminating pathological tissues comprising inorganic polymeric ferric salt and/or inorganic polymeric ferric salt composite as its active ingredients, in which the inorganic polymeric ferric salt is polyferric sulfate, and the inorganic polymeric ferric salt composite is selected from a group consisting of poly-silicate ferric salts, polyphosphate ferric salts and their analogue. A surprising medical effect can be reached by treating pathological tissues with the pharmaceutical composition of the present invention which will make the treated pathological tissues dehydrated, atrophied, and absorbed or sloughed off.
    Type: Application
    Filed: October 14, 2011
    Publication date: February 9, 2012
    Inventors: Kuok Leong TAM, Io cheng TAM, Hio man TAM
  • Patent number: 8088349
    Abstract: Disclosed is a clean method for preparing layered double hydroxides (LDHs), in which hydroxides of different metals are used as starting materials for production of LDHs by atom-economical reactions. The atom efficiency of the reaction is 100% in each case because all the atoms of the reactants are converted into the target product since only M2+(OH)2, M3+(OH)3, and CO2 or HnAn? are used, without any NaOH or other materials. Since there is no by-product, filtration or washing process is unnecessary. The consequent reduction in water consumption is also beneficial to the environment.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: January 3, 2012
    Assignee: Beijing University of Chemical Technology
    Inventors: Xue Duan, Dianqing Li, Zhi Lv, Yanjun Lin, Xiangyu Xu
  • Publication number: 20110311641
    Abstract: The present invention provides a pharmaceutical composition for dehydrating and atrophying pathological tissues comprising ferric subsulfate, polyferric sulfate or a mixture thereof is disclosed. Ferric subsulfate and polyferric sulfate are traditionally used as water treatment agent. The inventor surprisingly discovered the medical value of these substances. The compositions are cost-effective, convenient to use and have significant effects in treatment of vascular diseases such as hemorrhoids, hemangiomas, hematomas (including hematomas caused by brain hemorrhage), thrombi and varices, and topical traumas such as bleeding and edemas. The compositions are also capable of killing various tumor cells by targeted injection.
    Type: Application
    Filed: August 24, 2009
    Publication date: December 22, 2011
    Inventors: Kuok Leong Tam, Io cheng Tam, Hio man Tam
  • Publication number: 20100061920
    Abstract: A process is provided whereby a liquid ferrous sulfate or ferrous chloride solution containing 0.5-100% of the iron in the ferrous form (Fe2+) is oxidized in a continuous process using an ozone gas stream as an oxidant. The invention has advantages over prior art in that the process does not require additional elevated pressures (>1 atm), elevated temperatures, or additional liquid oxidant, and can be run in a continuous, rather than a batch process.
    Type: Application
    Filed: September 10, 2008
    Publication date: March 11, 2010
    Inventors: Kevin Edward Janak, Levi James Grove
  • Publication number: 20090324467
    Abstract: A magnetic chemical absorbent according to the present invention is provided with a composite, which is constituted of a core substance comprising magnetite fine particles and schwertmannite being precipitated around the core substance to chemically bond therewith. This magnetic chemical absorbent can be produced in a hydrolysis reaction step, in which crystal of schwertmannite is precipitated by means of hydrolysis reaction by heating a solution of ferric salt and thereafter adding a reactive substance thereto, by means of adding magnetite fine particles into the solution after the solution is heated and before the precipitation of the crystal begins. This magnetic chemical absorbent is novel and good one whose absorption capability for harmful ion is upgraded more. In accordance with a waste-liquid treating method using this magnetic chemical substance, it is possible to intend the reduction of burdens in view of environmental and economic aspects. Moreover, this magnetic chemical absorbent is recyclable.
    Type: Application
    Filed: August 27, 2007
    Publication date: December 31, 2009
    Applicant: National University Corporation Nagoya University
    Inventors: Masazumi Okido, Yoshiyuki Bando, Akbar Eskandarpour, Kensuke Sassa, Shigeo Asai
  • Patent number: 7575735
    Abstract: The present invention includes pure single-crystalline metal oxide and metal fluoride nanostructures, and methods of making same. These nanostructures include nanorods and nanoarrays.
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: August 18, 2009
    Assignee: The Research Foundation of State University of New York
    Inventors: Stanislaus S. Wong, Yuanbing Mao
  • Patent number: 7537749
    Abstract: The invention concerns a method for processing heavy metal-laden spent sulfuric acid. For this, iron-laden spent sulfuric acid or iron-laden sulfuric materials obtained therefrom are reacted with a material that contains iron chloride and optionally other metal chlorides, producing iron (II) sulfate. The spent sulfuric acid preferably derives from titanium dioxide production.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: May 26, 2009
    Assignee: Tronox Pigments GmbH
    Inventors: Gerhard Auer, Berndt-Ullrich Köhler, Benno Laubach
  • Patent number: 7473409
    Abstract: A recycling process is presented to treat spent waste acid solutions whereby useful products are produced. Spent waste acid containing inorganic and organic contaminants is mixed with a magnesium compound containing aluminum and iron compounds that form oxyhydroxide flocs that complex, react, sequester and/or co-precipate the contaminates from the admixture. The magnesium reacts with sulfate ions to form a high quality magnesium sulfate solution.
    Type: Grant
    Filed: August 30, 2006
    Date of Patent: January 6, 2009
    Assignee: Veolia ES Technical Solutions L.L.C.
    Inventor: Danny Mislenkov
  • Patent number: 7387770
    Abstract: A process is provided for the production of liquid ferric sulfate from finely-divided ferric oxide, sulfuric acid and water in a reaction system comprising at least one closed reaction vessel at temperatures ranging from about 120° C. to about 150° C. and pressures from about 25 psi to about 70 psi. Iron oxide streams are fed countercurrent to the ferric sulfate reaction product stream and to the sulfuric acid and water feeds. The continuity of the reaction is effected by re-circulating fractions while withdrawing a fraction of the liquid ferric sulfate having a trivalent iron concentration of at least 10% from the reaction vessel. Yield and efficiency are provided by controlling the rate of iron ore, sulfuric acid and specific gravity and by counter current cycling the waste stream from the reaction through the dilution water and use of a polymeric settling agent to remove unreacted iron content from the digester output.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: June 17, 2008
    Assignee: General Chemical Performance Products Inc.
    Inventors: Mark Alan Wilkinson, Joseph Hurd, David Stone
  • Patent number: 7351391
    Abstract: A system and method of economically converting a spent first pickling acid solution that contains hydrochloric acid, water and ferrous chloride into a suitable second pickling solution. Sulfuric acid is added to the first pickling acid solution. This produces a regeneration solution. In the regeneration solution, the sulfuric acid reacts with said ferrous chloride and water to produce ferrous sulfate heptahydrate and hydrochloric acid. The regeneration solution is cooled to promote precipitation of the ferrous sulfate heptahydrate from the regeneration solution, therein creating ferrous sulfate heptahydrate crystals and a second pickling acid solution. The second pickling acid solution contains both hydrochloric acid and sulfuric acid. The ferrous sulfate heptahydrate crystals are separated from second pickling solution. The ferrous sulfate heptahydrate is sold commercially and the second pickling acid solution is used to directly pickle ferrous metal.
    Type: Grant
    Filed: May 16, 2005
    Date of Patent: April 1, 2008
    Inventors: Douglas R. Olsen, Charles D. Blumenschein
  • Patent number: 7338647
    Abstract: The present invention relates to a method for preparing an electroactive metal polyanion or a mixed metal polyanion comprising forming a slurry comprising a polymeric material, a solvent, a polyanion source or alkali metal polyanion source and at least one metal ion source; heating said slurry at a temperature and for a time sufficient to remove the solvent and form an essentially dried mixture; and heating said mixture at a temperature and for a time sufficient to produce an electroactive metal polyanion or electroactive mixed metal polyanion.
    Type: Grant
    Filed: May 20, 2004
    Date of Patent: March 4, 2008
    Assignee: Valence Technology, Inc.
    Inventors: Biying Huang, Jeffrey Swoyer, M. Yazid Saidi, Haitao Huang
  • Patent number: 7211235
    Abstract: A method is described for the manufacture of hydrotalcites by using at least one compound of a bivalent metal (Component A) and at least one compound of a trivalent metal (Component B), wherein at least one of these components is not used in the form of a solution, characterized in that a) at least one of the Components A and/or B which is not used in the form of a solution, shortly before or during mixing of the components, and/or b) the mixture containing the Components A and B is subjected to intensive grinding until an average particle size (D50) in the range of approx. 0.1 to 5 ?m is obtained, and optionally, after aging treatment or hydrothermal treatment, the resulting hydrotalcite product is separated, dried, and optionally calcinated.
    Type: Grant
    Filed: April 18, 2002
    Date of Patent: May 1, 2007
    Assignee: Sud-Chemie AG
    Inventors: Max Eisgruber, Jürgen Ladebeck, Jürgen Koy, Hubert Schiessling, Wolfgang Buckl, Herrmann Ebert
  • Patent number: 7097816
    Abstract: In a method of producing ferrous sulfate heptahydrate, ferrous sulfate monohydrate is converted in a crystallization reactor in the presence of water into ferrous sulfate heptahydrate as crystallized product, and water is subsequently isolated from the ferrous sulfate heptahydrate. Ferrous sulfate monohydrate is obtained from a pickling solution containing ferrous chloride, hydrochloric acid and water and reacted in a precipitating reactor in the presence of excess sulfuric acid to form ferrous sulfate monohydrate and hydrochloric acid. The ferrous sulfate monohydrate is then dehumidified and converted in a crystallization reactor in the presence of excess water into ferrous sulfate heptahydrate.
    Type: Grant
    Filed: July 23, 2004
    Date of Patent: August 29, 2006
    Inventor: Alexander Kehrmann
  • Patent number: 7067100
    Abstract: A process for the production of liquid ferric sulfate from finely-divided ferric oxide, sulfuric acid and water in a closed reaction vessel at temperatures ranging from about 130.degree. C. to about 150.degree. C. and pressures from about 30 psi to about 70 psi. The reaction time ranges from Four to eight hours and produces liquid ferric sulfate having at least 10% trivalent iron. Yield and efficiency are provided by controlling the specific gravity prior to the reaction and by counter current cycling the waste stream from the reaction through the dilution water and use of a polymeric settling agent to remove unreacted iron content from the digester output.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: June 27, 2006
    Assignee: General Chemical Corporation
    Inventors: Steven Faigen, Joseph Hurd, Larry Knuth
  • Patent number: 6986968
    Abstract: A cathode active material for a lithium secondary cell used in a cellular phone is disclosed. The cathode active material for the lithium secondary cell and the method the same having a high capacity and a long lifetime, different from LiCoO2 and LiMn2O4, Li(Ni, Co)O2, and V-system oxide that has been researched as the active material for substituting LiCoO2 are provided. The cathode active material for the lithium secondary cell in the next formula 1 is obtained by heating or chemically treating diadochite [Fe2(PO4)(SO4)(OH).6H2O] that is the mineral containing PO43?, SO42?, and OH?. LiaFebMc(PO4)x(SO4)y(OH)z ??(1) In the formula, M is at least one element selected from a radical consisting of Mg, Ti, Cr, Mn, Co, Ni, Cu, Zn, Al, and Si, with 0?a, c?0.5, 1?b?2, 0.5?x, y, z?1.5.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: January 17, 2006
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Young Sik Hong, Kwang Sun Ryu, Soon Ho Chang, Yong Joon Park, Young Gi Lee, Kwang Man Kim, Nam Gyu Park, Man Gu Kang, Xiang Lan Wu
  • Patent number: 6852297
    Abstract: A method of treating residual acid from production of chlorine dioxide is described. The method is characterized in that a compound containing iron is added to the residual acid to react therewith and form a product, which contains iron in trivalent form. As iron compound preferably ferrous sulphate is added, which under oxidation reacts with the residual acid to form ferric salt. Preferably sodium chlorate, sodium hypochlorite, hydrogen peroxide or an oxygen-containing gas is added as oxidant.
    Type: Grant
    Filed: April 4, 2003
    Date of Patent: February 8, 2005
    Assignee: Kemira Kemi AB
    Inventors: Lars Gillberg, Roger Bårström, Hannu Luhtala
  • Patent number: 6846346
    Abstract: The invention provides a hydrometallurgical process for treating metal-containing sulfide ores and concentrates, comprising reacting said metal-containing sulfide with concentrated sulfuric acid at a temperature of between about 300° C. and 400° C. in the presence of oxygen to produce a solid metal sulfate product and a gaseous product which is primarily SO3, wherein said metal is selected from the group consisting of iron, copper, zinc, nickel, cobalt and manganese. Said metal sulfate product is then leached with dilute sulfuric acid to form a metal-containing solution, from which the metal values are separated by precipitation at raised H2SO4 concentrations obtained by saturating the solution with the gaseous SO3 from the sulfatization reaction step.
    Type: Grant
    Filed: August 29, 2000
    Date of Patent: January 25, 2005
    Assignee: Joma Chemicals AS
    Inventor: Solomon Flax
  • Publication number: 20040179992
    Abstract: A process for the production of liquid ferric sulfate from finely-divided ferric oxide, sulfuric acid and water in a closed reaction vessel at temperatures ranging from about 130.degree.C. to about 150.degree.C. and pressures from about 30 psi to about 70 psi. The reaction time ranges from Four to eight hours and produces liquid ferric sulfate having at least 10% trivalent iron. Yield and efficiency are provided by controlling the specific gravity prior to the reaction and by counter current cycling the waste stream from the reaction through the dilution water and use of a polymeric settling agent to remove unreacted iron content from the digester output.
    Type: Application
    Filed: March 12, 2003
    Publication date: September 16, 2004
    Inventors: Steven Faigen, Joseph Hurd, Larry Knuth
  • Publication number: 20030026746
    Abstract: Apparatus and method for regenerating spent pickling liquor from the acid pickling of a metal are disclosed. Acid pickling of a metal uses a first acid and forms a spent pickling liquor (SPL). A second acid added to the spent pickling liquor, under specific low temperatures produces a metal salt of the second acid. The metal salt of the second acid is crystallized and removed from a regenerated first acid. In one aspect, hydrochloric acid is regenerated from a pickling process for iron or steel, using sulfuric acid as the second acid, and ferrous sulfate heptahydrate crystals are produced. Regenerated hydrochloric acid is recycled to the acid pickling process.
    Type: Application
    Filed: September 17, 2002
    Publication date: February 6, 2003
    Inventors: Douglas R. Olsen, Charles D. Blumenschein
  • Patent number: 6375919
    Abstract: A method for the manufacture of a ferric sulfate solution is provided, characterized in that, iron ore containing 30% by weight or more FeOOH as a trivalent iron (Fe3+) is calcined at 200-600° C., and then dissolved in sulfuric acid. A water treatment agent consisting of a basic ferric sulfate solution manufactured by the above mentioned manufacturing method is used as a coagulating agent for water treatment.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: April 23, 2002
    Assignee: Taki Chemical Co., Ltd.
    Inventors: Toshihiko Kakio, Tatsuo Tsukamoto
  • Patent number: 6315975
    Abstract: Fumed silica is used to suspend iron sulfates in concentrated sulfuric acid. The suspension system substantially reduces iron sulfate deposits in steel containment vessels.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: November 13, 2001
    Assignee: Rhodia Inc.
    Inventor: Donald Edward Lindblad
  • Patent number: 6203769
    Abstract: The invention relates to a method for the treatment of fluoboric electrolyte resulting from the processes of electro-extraction of metals such as copper and lead comprising a leaching stage with fluoboric acid, in order to recycle said fluoboric acid to be recirculated to said leaching stage devoid of impurities of metals such as Me=Fe, Zn, Ca, Mg, Cd, characterized in that it comprises the stages of: a) treating said fluoboric electrolyte comprising Cu(BF4)2 or Pb(BF4)2 with H2S in order to precipitate CuS or PbS respectively in accordance with the reactions Cu(BF4)2+H2S=>CuS+2HBF4  (1) Pb(BF4)2+H2S=>PbS+2HBF4  (2) thus obtaining a solution of HBF4 containing the fluoborates of said metals Me, said solution being separated, b) treating said Me fluoborates with H2SO4 in accordance with the reaction 2 Me(BF4)n+n H2SO4=>Me(SO4)n+2n HBF4  (3) (where Me=Fe, Zn, Ca, Mg, Cd) it being possible for said sulp
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: March 20, 2001
    Assignee: Ecochem Aktiengesellschaft
    Inventor: Gianni Zoppi
  • Patent number: 6056935
    Abstract: The invention provides an iron sulfide characterized in that it comprises FeS.sub.2, Fe.sub.1-x S, Fe.sub.3 O.sub.4 and FeSO.sub.4, and that the secondary particles thereof, have a 50% volume-cumulative particle diameter of from 20 to 300 .mu.m. The invention also provides a process for producing an iron sulfide comprising the steps of introducing (a) ferrous sulfate monohydrate having a d.sub.50 of from 20 to 300 .mu.m and (b) not less than stoichiometric amount of at least one sulfur compound selected from elemental sulfur and hydrogen sulfide into the fluidized bed of a furnace and then fluidizing, burning, and reacting the ingredients at a temperature of from 350 to less than 630.degree. C., a superficial velocity of 0.1 m/sec or higher, and a pressure of 1 atm or higher using air as a fluidizing gas.
    Type: Grant
    Filed: November 24, 1997
    Date of Patent: May 2, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Tadashi Kai, Yuji Matsue, Masaaki Sakurai, Kunihiro Imada, Kenji Inokuchi
  • Patent number: 5916447
    Abstract: A method for treatment of water in which an aqueous solution containing a freshly made polymerised iron substance is produced, the produced polymerised iron substance is aged sufficiently long to provide for efficient treatment of water, and the aqueous solution containing aged polymerised iron substance is added to the water to be treated.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: June 29, 1999
    Assignee: Eka Chemicals AB
    Inventors: Felix Hulten, Goran Sivertsson
  • Patent number: 5908716
    Abstract: The invention provides a battery having an electrode active material comprising a mixed-metal sulfate compound. The mixed-metal consists of at least one alkali metal and at least one transition metal. Preferably, the sulfate compound is a polysulfate having more than one SO.sub.4 group. The invention also provides novel lithium-metal-sulfate compounds and electrodes comprising such novel compounds.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: June 1, 1999
    Assignee: Valence Technology, Inc.
    Inventor: Jeremy Barker
  • Patent number: 5785862
    Abstract: A process for preparing a polymeric form of ferric sulphate wherein an acidic aqueous solution including ferrous sulphate is oxidized to form ferric sulphate in the solution in an oxidation stage at ambient pressure and in the absence of oxidation catalyst using at least one oxidizing agent. The ferric sulphate is subsequently at least partially hydrolyzed by addition to the solution of at least one base. The ferric sulphate is kept in contact with the base at the temperature selected for a time sufficient for polymerization of the at least partially hydrolyzed ferric sulphate. The polyferric sulphate (PFS) obtained by embodiments of such a process can be used as a coagulant or flocculant in water treatments for decolorizing, purifying or reducing pollutants with improved performance compared to conventional ferric sulphate and aluminium sulphate treatments.
    Type: Grant
    Filed: September 18, 1996
    Date of Patent: July 28, 1998
    Assignee: Imperial College of Science Technology & Medicine
    Inventors: Nigel Johnathan Douglas Graham, Jiaqian Jiang
  • Patent number: 5776424
    Abstract: There is provided a method for making a monovalent inorganic anion-intercalated hydrotalcite-like material by first reacting a magnesium-containing powder and a transition alumina powder in a carboxylic acid-free, aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a monovalent inorganic anion, in its acid or soluble salt form, to make a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include a bromide-, chloride-, nitrate- or vanadate-intercalated, hydrotalcite-like material.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: July 7, 1998
    Assignee: Aluminum Company of America
    Inventors: Edward S. Martin, John M. Stinson, Vito Cedro, III, William E. Horn, Jr.
  • Patent number: 5770172
    Abstract: The present invention is directed to a process for producing a nanometer-sized metal compound. The process comprises forming a reverse micelle or reverse microemulsion system comprising a polar fluid in a non-polar or low-polarity fluid. A first reactant comprising a multi-component, water-soluble metal compound is introduced into the polar fluid in a non-polar or low-polarity fluid. This first reactant can be introduced into the reverse micelle or reverse microemulsion system during formation thereof or subsequent to the formation of the reverse micelle or microemulsion system. The water-soluble metal compound is then reacted in the reverse micelle or reverse microemulsion system to form the nanometer-sized metal compound. The nanometer-sized metal compound is then precipitated from the reverse micelle or reverse microemulsion system.
    Type: Grant
    Filed: October 4, 1996
    Date of Patent: June 23, 1998
    Assignee: Battelle Memorial Institute
    Inventors: John C. Linehan, John L. Fulton, Roger M. Bean
  • Patent number: 5766566
    Abstract: The invention relates to a process of preparing ferric sulfate by forming a slurry which contains ferrous sulfate and sulfuric acid, the slurry containing bivalent iron in both the solution phase and the solid phase, and by oxidizing this slurry to form a ferric sulfate slurry. When so desired, the obtained ferric sulfate slurry is solidified to form solid ferric sulfate. The obtained ferric sulfate may, as such or dissolved in water, be used for the treatment of waste waters or for preparing pure tap water.
    Type: Grant
    Filed: August 2, 1996
    Date of Patent: June 16, 1998
    Assignees: Kemira Pigments Oy, Kemira Chemicals Oy
    Inventors: Harri Mattila, Timo Kenakkala, Olli Konstari
  • Patent number: 5730951
    Abstract: There is provided a method for making a polyvalent inorganic anion-intercalated hydrotalcite-like material by first reacting a magnesium-containing powder and a transition alumina powder in a carboxylic acid-free, aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a polyvalent inorganic anion, in its acid, acid salt or ammonium salt form, to make a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include a borate- metatungstate- and paramolybdate-intercalated hydrotalcite-like material.
    Type: Grant
    Filed: May 14, 1996
    Date of Patent: March 24, 1998
    Assignee: Aluminum Company of America
    Inventors: Edward S. Martin, John M. Stinson, Vito Cedro, III, William E. Horn, Jr.
  • Patent number: 5728365
    Abstract: There is provided a method for making a divalent inorganic anion-intercalated hydrotalcite-like material by first reacting a magnesium-containing powder and a transition alumina powder in a carboxylic acid-free aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a divalent inorganic anion, in its acid, acid salt or ammonium salt form, to make a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include a sulfate- and metavanadate-intercalated hydrotalcite-like material.
    Type: Grant
    Filed: May 14, 1996
    Date of Patent: March 17, 1998
    Assignee: Aluminum Company of America
    Inventors: Edward S. Martin, John M. Stinson, Vito Cedro, III, William E. Horn, Jr.
  • Patent number: 5728366
    Abstract: There is provided a method for making monovalent organic anion-intercalated hydrotalcite-like materials by first reacting a magnesium-containing powder and a transition alumina powder in a carboxylic acid-free, aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a monovalent organic anion to form a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include a stearate-, acetate- or benzoate-intercalated hydrotalcite-like material.
    Type: Grant
    Filed: May 14, 1996
    Date of Patent: March 17, 1998
    Assignee: Aluminum Company of America
    Inventors: Edward S. Martin, John M. Stinson, Vito Cedro, III, William E. Horn, Jr.
  • Patent number: 5728364
    Abstract: There is provided an improved method for making synthetic hydrotalcite by first reacting a divalent metal compound with a trivalent metal oxide powder in a carboxylic acid-free, aqueous solution or suspension to form an intermediate. This intermediate is then contacted with an anion source such as carbon dioxide; a carbonate-containing compound; an acid or an ammonium salt to form a layered double hydroxide having the formula:A.sub.1-x B.sub.x (OH).sub.2 C.sub.z.mH.sub.2 O, where A represents a divalent metal cation, B represents a trivalent metal cation, C represents a mono- to polyvalent anion, and x, z and m satisfy the following conditions: 0.09<x<0.67; z=x/n, where n=the charge on the anion; and 2>m>0.5. Said layered double hydroxide is typically separated from the suspension by filtering, centrifugation, vacuum dehydration or other known means.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: March 17, 1998
    Assignee: Aluminum Company of America
    Inventors: Edward S. Martin, John M. Stinson, Vito Cedro, III, William E. Horn, Jr.
  • Patent number: 5728363
    Abstract: There is provided an improved method for making synthetic hydrotalcite by first reacting powdered magnesium oxide with a high surface area, transition alumina in a solution or suspension to form a meixnerite-like intermediate. This intermediate is then contacted with an anion source such as an acid, and most preferably carbon dioxide, to form the layered double hydroxide which is separated from the suspension by filtering, centrifugation, vacuum dehydration or other known means. On a preferred basis, the transition alumina combined with activated magnesia consists essentially of an rehydratable alumina powder having a surface area of 100 m.sup.2 /g or greater. To make related double hydroxide compounds, still other reactants such as bromides, chlorides, boric acids, or salts thereof, may be substituted for the carbon dioxide gas fed into this suspension.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: March 17, 1998
    Assignee: Aluminum Company of America
    Inventors: Edward S. Martin, John M. Stinson, William E. Horn, Jr., Vito Cedro, III
  • Patent number: 5695893
    Abstract: A positive electrode material for use in lithium batteries contains a compound represented by the chemical formula Li.sub.x Fe.sub.2 (SO.sub.4).sub.3 (0<x.ltoreq.2). This positive electrode material is made from low cost material which is available in abundant quantities. Moreover a lithium battery using this material has a large discharge energy and long cycle life.
    Type: Grant
    Filed: May 6, 1996
    Date of Patent: December 9, 1997
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Hajime Arai, Shigeto Okada, Yoji Sakurai, Jun-ichi Yamaki
  • Patent number: 5624650
    Abstract: Ferric sulfate is produced by treating ferric ammonium sulfate, ammonium jarosite or a similar iron complex with nitric acid. The ferric ammonium sulfate or ammonium jarosite can be formed by treating a sulfuric acid leaching solution, e.g., a solution used to leach zinc or copper ore concentrate, with a solution of ammonium nitrate. Thereafter, upon addition of dilute nitric acid at a temperature of about 60.degree. C., ferric sulfate forms and is recovered.
    Type: Grant
    Filed: February 22, 1996
    Date of Patent: April 29, 1997
    Assignee: Environchip Technologies, Inc.
    Inventors: Thomas D. McEwan, William E. Pfaffenberger
  • Patent number: 5578286
    Abstract: There is provided a method for making a divalent or polyvalent organic anion-intercalated hydrotalcite-like materials by first reacting a magnesium-containing powder and a transition alumina powder in an aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a dicarboxylate or polycarboxylate anion to form a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include an oxalate-, succinate- or terephthalate-intercalated hydrotalcite-like material.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 26, 1996
    Assignee: Aluminum Company of America
    Inventors: Edward S. Martin, John M. Stinson, Vito Cedro, III, William E. Horn, Jr.
  • Patent number: 5417955
    Abstract: A two step method of converting ferrous chloride from a pickling liquor to produce hydrochloric acid and ferric sulfate is disclosed. The ferrous chloride is first mixed with sulfuric acid to produce ferrous sulfate and HCl. The HCl is carried to an absorbtion tower where most of the HCl is collected and the remainder is returned to the reactor. The ferrous sulfate is separated from the sulfuric acid. The unreacted sulfuric acid is returned to the reactor and the ferrous sulfate is transported to a second reactor where it is reacted with sulfuric acid and air (O.sub.2) to produce ferric sulfate. The ferric sulfate is removed from the second reactor. Both reactions are carried out at relatively low temperatures under atmospheric pressures.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: May 23, 1995
    Inventor: David W. Connolly