Forming Insoluble Substance In Liquid Patents (Class 423/92)
  • Patent number: 9533904
    Abstract: Organo clay and activated carbon are mixed to form a particle mixture. The particle mixture is contacted with waste water having chlorides and other contaminants, such as organic materials, heavy metals, chlorides, and low level radio nuclei in solution. Acids, oxidizing chemicals, and compressed air are added to pretreat and to treat the waste water. The mixture is filtered with catalytic activated carbon filters to remove the remaining contaminants. The filters produce a clean chloride solution that is discharged or is subjected to a finishing process to produce a marketable chloride product.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: January 3, 2017
    Inventor: Tom Lewis, III
  • Patent number: 8999274
    Abstract: A process for treating a mixed sulphidic material containing lead sulphide and at least one other metal sulphide. The process includes the steps of subjecting the mixed sulphidic material to selective oxidation such that lead sulphide in the material is oxidised to form an oxidized lead compound while substantial oxidation of the at least one other metal sulphide is avoided, and separating the oxidized lead compound from the at least one other metal sulphide. The oxidized lead compound may be separated by flotation wherein the oxidized lead compound reports to the tailings and the at least one other metal sulphide reports to the concentrate (froth).
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: April 7, 2015
    Assignee: Glencore Queensland Limited
    Inventors: Patrick Bowen, Michael Matthew Hourn
  • Patent number: 8980203
    Abstract: The present invention relates to the recovery of high purity litharge from spent lead acid battery paste at a low temperature which does not produce sulfur dioxide. In the process lead acetate or other lead salt is produced which is converted to high purity litharge by precipitation with a base.
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: March 17, 2015
    Assignee: Retriev Technologies Incorporated
    Inventors: W. Novis Smith, Steven Kinsbursky
  • Publication number: 20140322108
    Abstract: A process for treating a mixed sulphidic material containing lead sulphide and at least one other metal sulphide. The process includes the steps of subjecting the mixed sulphidic material to selective oxidation such that lead sulphide in the material is oxidised to form an oxidised lead compound while substantial oxidation of the at least one other metal sulphide is avoided, and separating the oxidized lead compound from the at least one other metal sulphide. The oxidized lead compound may be separated by flotation wherein the oxidized lead compound reports to the tailings and the at least one other metal sulphide reports to the concentrate (froth).
    Type: Application
    Filed: August 8, 2012
    Publication date: October 30, 2014
    Inventors: Patrick Bowen, Michael Matthew Hourn
  • Patent number: 8802041
    Abstract: There is provided a process for decontaminating and converting volumetrically contaminated radioactive metals, especially nickel, and recovering a decontaminated metal hydroxide or metal carbonate. The process includes the use of hydrogen peroxide to oxidize and remove nucleotides.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: August 12, 2014
    Assignee: Toxco, Inc.
    Inventors: W. Novis Smith, David S. Eaker
  • Patent number: 8771620
    Abstract: Disclosed is a method for recycling lead from waste glass containing lead, which comprises the following steps: mechanical crushing waste glass containing lead, ball milling and screening to obtain glass powder containing lead; alkaline roasting the glass powder containing lead to obtain a roasted material; mixing polycarboxylic acid complexant and nitric acid to produce leaching agent, and then placing the roasted material into the leaching agent to obtain leachate; regulating pH value of the leachate to solidify metal ion to obtain precipitate, separating and removing impurities, rinsing and drying to obtain chemical product containing lead. The method avoids environment pollution caused by waste glass containing lead.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: July 8, 2014
    Assignee: Shenzhen Gem High-Tech Co., Ltd.
    Inventors: Kaihua Xu, Miaomiao Guo, Xianda He, Xiaokui Liang
  • Publication number: 20140154157
    Abstract: There is described a process of recycling screen glass resulting from the disposal of cathode tube televisions, with quantitative recovery of lead in the form of sulphide and of silicates of cations other than lead, and subsequently recycling all the materials so recovered.
    Type: Application
    Filed: December 3, 2012
    Publication date: June 5, 2014
    Applicant: Costech International S.P.A.
    Inventor: Giovanni Modica
  • Patent number: 8568670
    Abstract: A process for producing basic lead carbonate is provided. The process comprises: (1) immersing neutralization slag to obtain sodium hydroxide solution; (2) leaching lead chloride slag with the aqueous solution containing sodium chloride and hydrochloric acid, adding sodium sulfide and filtering; (3) neutralizing the filtrate with sodium hydroxide solution, filtering and washing the precipitate; and (4) converting the precipitate to basic lead carbonate with ammonium bicarbonate, crystallizing and washing. Said neutralization slag and lead chloride slag are the redundant slag from fire refining bismuth. Said process makes better use of the redundant slag from fire refining bismuth, saves resources and reduces environmental pollution.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: October 29, 2013
    Assignee: Jiangxi Rare Earth and Rare Metals Tungsten Group Holding Co., Ltd.
    Inventors: Guorong Lin, Huanrong Yu, Jihong Li
  • Patent number: 8562923
    Abstract: The present invention relates to the recovery of high purity litharge from spent lead acid battery paste at a low temperature which does not produce sulfur dioxide. In the process lead acetate is produced which is converted to pure litharge.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: October 22, 2013
    Assignee: Toxco, Inc.
    Inventors: W. Novis Smith, Steven A. Kinsbursky
  • Publication number: 20130129585
    Abstract: Disclosed is a method for recycling lead from waste glass containing lead, which comprises the following steps: mechanical crushing waste glass containing lead, ball milling and screening to obtain glass powder containing lead; alkaline roasting the glass powder containing lead to obtain a roasted material; mixing polycarboxylic acid complexant and nitric acid to produce leaching agent, and then placing the roasted material into the leaching agent to obtain leachate; regulating pH value of the leachate to solidify metal ion to obtain precipitate, separating and removing impurities, rinsing and drying to obtain chemical product containing lead. The method avoids environment pollution caused by waste glass containing lead.
    Type: Application
    Filed: October 27, 2010
    Publication date: May 23, 2013
    Inventors: Kaihua Xu, Miaomiao Guo, Xianda He, Xiaokui Liang
  • Publication number: 20130043139
    Abstract: A process for producing basic lead carbonate is provided. The process comprises: (1) immersing neutralization slag to obtain sodium hydroxide solution; (2) leaching lead chloride slag with the aqueous solution containing sodium chloride and hydrochloric acid, adding sodium sulfide and filtering; (3) neutralizing the filtrate with sodium hydroxide solution, filtering and washing the precipitate; and (4) converting the precipitate to basic lead carbonate with ammonium bicarbonate, crystallizing and washing. Said neutralization slag and lead chloride slag are the redundant slag from fire refining bismuth. Said process makes better use of the redundant slag from fire refining bismuth, saves resources and reduces environmental pollution.
    Type: Application
    Filed: December 30, 2009
    Publication date: February 21, 2013
    Inventors: Guorong Lin, Huanrong Yu, Jihong Li
  • Patent number: 8323376
    Abstract: The present invention describes a method of recycling lead from lead containing waste, the method comprising the steps of mixing the battery paste with aqueous citric acid solution so as to generate lead citrate; isolating lead citrate from the aqueous solution; and converting the lead citrate to lead and/or lead oxide.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: December 4, 2012
    Assignee: Cambridge Enterprise Limited
    Inventors: Ramachandran Vasant Kumar, Vega Petrova Kotzeva, Seref Sonmez
  • Publication number: 20120301375
    Abstract: A method of preparing basic metal carbonate selected from the group consisting of zinc carbonate, nickel carbonate, silver carbonate, cobalt carbonate, tin carbonate, lead carbonate, manganese carbonate, lithium carbonate, sodium carbonate, and potassium carbonate from metals comprising: contacting the metal with an aqueous solution comprising an amine, carbonic acid, and oxygen under conditions where the metal is converted into basic metal carbonate; and recovering the basic metal carbonate.
    Type: Application
    Filed: May 27, 2011
    Publication date: November 29, 2012
    Inventors: Jeff Miller, Brian Miller, Andrew Bourdeau
  • Publication number: 20120251417
    Abstract: A method for recovering a metal, capable of recovering a metal easily without requiring the use of an organic medium, is provided. A complex between a chelating agent and a metal present in a sample is formed in a mixture prepared by mixing the chelating agent and the sample under pH conditions where the chelating agent can be insoluble in an aqueous medium. Then, the complex is recovered from the mixture, and further, the metal is recovered by dissolving the recovered complex in an aqueous medium under pH conditions that are different from the pH conditions where the chelating agent can be insoluble in an aqueous medium. By this method, a metal can be recovered easily without requiring the use of the use of an organic medium.
    Type: Application
    Filed: April 2, 2012
    Publication date: October 4, 2012
    Applicant: ARKRAY, INC.
    Inventors: Yuka Shimomura, Mayumi Yamada
  • Publication number: 20120251390
    Abstract: A method for recovering a metal, capable of recovering a metal easily without requiring the use of an organic medium, is provided. A first complex between a first chelating agent and a metal present in a sample is formed in a first mixture prepared by mixing the first chelating agent and the sample. Then, the first complex is recovered from the first mixture, and a second complex between the metal derived from the first complex and a second chelating agent is formed in a second mixture prepared by mixing the first complex and an aqueous solution of the second chelating agent. The aqueous solution is under the pH conditions where the first chelating agent can be insoluble in the aqueous solution. Then, a liquid fraction containing the second complex is recovered from the second mixture. Thus, the metal can be recovered.
    Type: Application
    Filed: April 2, 2012
    Publication date: October 4, 2012
    Applicant: ARKRAY, INC.
    Inventor: Yuka Shimomura
  • Patent number: 8211389
    Abstract: Uses for a composition comprising a polymer derived from at least two monomers: acrylic-x and an alkylamine, wherein said polymer is modified to contain a functional group capable of scavenging one or more compositions containing one or more metals are disclosed. These polymers have many uses in various mediums, including wastewater systems.
    Type: Grant
    Filed: April 6, 2010
    Date of Patent: July 3, 2012
    Assignee: Nalco Company
    Inventors: Paul J. Zinn, Jitendra T. Shah, William J. Andrews
  • Patent number: 8147780
    Abstract: Wet process of low environmental impact recovers the lead content of an electrode slime and/or of lead minerals in the valuable form of high purity-lead carbonates that are convertible to highly pure lead oxide by heat treatment in oven at relatively low temperature, perfectly suited for making active electrode pastes of new batteries or other uses.
    Type: Grant
    Filed: January 15, 2008
    Date of Patent: April 3, 2012
    Assignee: Millbrook Lead Recycling Technologies Limited
    Inventor: Federica Martini
  • Publication number: 20110274598
    Abstract: Disclosed is a process for removing metals from waste, particularly electronic waste (or “e-waste”). The process generally includes the steps of dissolving at least some of the metals from the waste with nitric acid reagent and then causing at least some of the metals to precipitate as metal oxides and/or metal nitrates. NOx gases produced as by-product by the nitric acid dissolution of metallic components in the electronic waste are reused, in particular for generating permanganate when one of the metallic components comprises manganese.
    Type: Application
    Filed: April 14, 2009
    Publication date: November 10, 2011
    Inventor: James R. Akridge
  • Patent number: 8012336
    Abstract: Proposed is a method for collecting valuable metal from an ITO scrap in which a mixture of indium hydroxide and tin hydroxide or metastannic acid is collected by subjecting the ITO scrap to electrolysis in pH-adjusted electrolyte, and roasting this mixture as needed to collect the result as a mixture of indium oxide and tin oxide. This method enables the efficient collection of indium hydroxide and tin hydroxide or metastannic acid, or indium oxide and tin oxide from an ITO scrap of an indium-tin oxide (ITO) sputtering target or an ITO scrap such as ITO mill ends arisen during the manufacture of such ITO sputtering target.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: September 6, 2011
    Assignee: JX Nippon Mining & Metals Corporation
    Inventors: Yuichiro Shindo, Kouichi Takemoto
  • Patent number: 8012335
    Abstract: Proposed is a method for collecting valuable metal from an ITO scrap including a step of collecting tin by subjecting the ITO scrap to electrolysis. Further proposed is a method for collecting valuable metal from an ITO scrap including the steps of providing an ITO electrolytic bath and a tin collecting bath, dissolving the ITO scrap in the electrolytic bath, and thereafter collecting tin in the tin collecting bath. Additionally proposed is a method for collecting valuable metal from an ITO scrap including the steps of dissolving the ITO scrap by subjecting it to electrolysis as an anode in electrolyte, precipitating only tin contained in the solution as tin itself or a substance containing tin, extracting the precipitate, placing it in a collecting bath, re-dissolving this to obtain a solution of tin hydroxide, and performing electrolysis or neutralization thereto in order to collect tin.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: September 6, 2011
    Assignee: JX Nippon Mining & Metals Corporation
    Inventors: Yuichiro Shindo, Kouichi Takemoto
  • Patent number: 8003065
    Abstract: Proposed is a method for collecting valuable metal from an ITO scrap including the steps of subjecting the ITO scrap to electrolysis in pH-adjusted electrolyte, and collecting indium or tin as oxides. Additionally proposed is a method for collecting valuable metal from an ITO scrap including the steps of subjecting the ITO scrap to electrolysis in an electrolytic bath partitioned with a diaphragm or an ion-exchange membrane to precipitate hydroxide of tin, thereafter extracting anolyte temporarily, and precipitating and collecting indium contained in the anolyte as hydroxide. With the methods for collecting valuable metal from an ITO scrap described above, indium or tin may be collected as oxides by roasting the precipitate containing indium or tin. Consequently, provided is a method for efficiently collecting indium from an ITO scrap of an indium-tin oxide (ITO) sputtering target or an ITO scrap such as ITO mill ends arisen during the manufacture of such ITO sputtering target.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: August 23, 2011
    Assignee: JX Nippon Mining & Metals Corporation
    Inventors: Yuichiro Shindo, Kouichi Takemoto
  • Patent number: 7998440
    Abstract: An outstandingly low environmental impact wet process recovers the lead content of an electrode slime and/or of lead minerals in the valuable form of high purity lead oxide or compound convertible to highly pure lead oxide by heat treatment in oven at relatively low temperature, perfectly suited for making active electrode pastes of new batteries or other uses.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: August 16, 2011
    Assignee: Millbrook Lead Recycling Technologies Limited
    Inventor: Federica Martini
  • Publication number: 20110123418
    Abstract: A process for the recovery of a metal sulfide from a metal ion containing solution, including the steps of: a) providing a slurry containing seed panicles of said metal sulfide; h) adding a sulfide ion containing solution to said slurry to form an activated seed slurry; c) mixing said activated seed slurry with said metal ion containing solution to thereby form a metal sulfide precipitate; and d) recovering said metal sulfide precipitate.
    Type: Application
    Filed: June 26, 2009
    Publication date: May 26, 2011
    Applicant: BHP BILLITON SSM DEVELOPMENT PTY LTD
    Inventor: Eric Girvan Roche
  • Patent number: 7906084
    Abstract: Disclosed is a method for producing, controlling the shape and size of, Pb-chalcogenide nanoparticles. The method includes preparing a lead (Pb) precursor containing Pb and a carboxylic acid dissolved in a hydrocarbon solution and preparing a chalcogen element precursor containing a chalcogen element dissolved in a hydrocarbon solution. The amount of Pb and chalcogen in the respective precursor affords for a predetermined Pb:chalcogen element ratio to be present when the Pb precursor is mixed with the chalcogen element precursor. The Pb precursor is mixed with the chalcogen element precursor to form a Pb-chalcogen mixture in such a manner that Pb-chalcogenide nanoparticle nucleation does not occur. A nucleation and growth solution containing a surfactant is also prepared by heating the solution to a nucleation temperature sufficient to nucleate nanoparticles when the Pb-chalcogen element mixture is added.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: March 15, 2011
    Assignees: Toyota Motor Engineering & Manufacturing North America, Inc., University of California, Berkeley
    Inventors: Taleb Mokari, Minjuan Zhang, Peidong Yang
  • Patent number: 7785561
    Abstract: A process for producing high purity lead oxide from impure lead compounds particularly from waste lead battery paste which includes an oxidation-reduction step. The process results in a reduction of impure lead compounds to the +2 valence state and metal particle contaminants are oxidized to the +2 state.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: August 31, 2010
    Assignees: Toxco. Inc, Kinsbursky Brothers, Inc.
    Inventors: W. Novis Smith, Steven A. Kinsbursky
  • Publication number: 20100143219
    Abstract: Provided is a process for producing fine particles of pure lead oxide from a waste lead oxide paste obtained from exhausted lead-acid batteries. The lead oxide particles so produced are substantially spherical and have a weight average particle size from about 13 nm to about 100 nm, which, are of nano-particle dimensions. The process according to the present invention is capable to produce pure lead oxide of PbO2 and lead oxide of Pb3O4 or commonly known as red lead.
    Type: Application
    Filed: January 3, 2008
    Publication date: June 10, 2010
    Applicant: TAI-KWONG-YOKOHAMA BATTERY INDUSTRIED SDN BHD
    Inventor: Siew Hon Chow
  • Publication number: 20100034715
    Abstract: Wet process of low environmental impact recovers the lead content of an electrode slime and/or of lead minerals in the valuable form of high purity-lead carbonates that are convertible to highly pure lead oxide by heat treatment in oven at relatively low temperature, perfectly suited for making active electrode pastes of new batteries or other uses.
    Type: Application
    Filed: January 15, 2008
    Publication date: February 11, 2010
    Applicant: Millbrook Lead Recycling Technologies Limited
    Inventor: Federica Martini
  • Patent number: 7537741
    Abstract: A method for treating a polymetallic sulfide ore containing gold and/or silver, and further containing base metals selected from the group consisting of iron, aluminum, chromium, titanium, copper, zinc, lead, nickel, cobalt, mercury, tin, and mixtures thereof, is disclosed. The method comprises the steps of grinding the polymetallic sulfide ore to produce granules, oxidizing the granules to produce oxidized granules, and chloride leaching the granules using a brine solution including dissolved halogens, as well as chloride and bromide salts.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: May 26, 2009
    Assignee: Nichromet Extraction Inc.
    Inventor: Jean-Marc Lalancette
  • Patent number: 7507496
    Abstract: A process for recovering lead oxides from the spent paste of exhausted lead acid batteries. The process provides heating the spent paste with an alkali hydroxide solution at elevated temperatures prior to calcinations. Calcination is at various temperatures so that either lead mono-oxide, lead dioxide or red lead is obtained as the principal product. There is also provided the use of the lead oxide to prepare the paste for positive and negative electrodes or other lead compounds.
    Type: Grant
    Filed: December 7, 2004
    Date of Patent: March 24, 2009
    Assignees: Toxco, Inc, Kinsbursky Brothers Inc
    Inventors: Steven A. Kinsbursky, W. Novis Smith, Richard Schutte
  • Patent number: 7498012
    Abstract: The present invention relates to a desulfurization process of pastel and grids of lead accumulators comprising a carbonation in two steps, a granulometric separation between the two steps followed by specific desulfurization of the large part, a desodification obtaining the conversion of the PbSO4 contained in the pastel into PbCO3 which can be easily converted into metallic Pb in an oven by the addition of coal. The system used for the desodification of the large part of the pastel can also be used for the desulfurization of the fine part of the grids.
    Type: Grant
    Filed: January 12, 2005
    Date of Patent: March 3, 2009
    Assignee: ENGITEC S.r.l.
    Inventors: Marco Olper, Massimo Maccagni, Silvano Cossali
  • Patent number: 7208133
    Abstract: A high temperature non-aqueous synthetic procedure for the preparation of substantially monodisperse IV-VI semiconductor nanoparticles is provided. The procedure includes introducing a first precursor selected from the group consisting of a molecular precursor of a Group IV element and a molecular precursor of a Group VI element into a reaction vessel that comprises at least an organic solvent to form a mixture. Next, the mixture is heated and thereafter a second precursor of a molecular precursor of a Group IV element or a molecular precursor of a Group VI element that is different from the first is added. The reaction mixture is then mixed to initiate nucleation of IV-VI nanocrystals and the temperature of the reaction mixture is controlled to provide nanoparticles having a diameter of about 20 nm or less.
    Type: Grant
    Filed: November 22, 2004
    Date of Patent: April 24, 2007
    Assignee: International Business Machines Corporation
    Inventors: Kyung-Sang Cho, Wolfgang Gaschler, Christopher B. Murray, Dmitri Talapin
  • 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: 7115219
    Abstract: A method of producing an Indium Tin Oxide powder is described. A method of producing an Indium Tin Oxide powder comprising the steps of: (1) mixing a raw aqueous solution containing indium ions and tin ions and having a proportion of divalent tin ions in the tin ions of 50 wt % or more with an alkali aqueous solution, (2) separating the product into solid and liquid, and (3) calcinating the resulted solid.
    Type: Grant
    Filed: September 8, 2003
    Date of Patent: October 3, 2006
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Takeshi Hattori, Shinji Fujiwara, Kunio Saegusa
  • Patent number: 7049347
    Abstract: Disclosed is a method for making amorphous spherical particles of zirconium titanate and crystalline spherical particles of zirconium titanate comprising the steps of mixing an aqueous solution of zirconium salt and an aqueous solution of titanium salt into a mixed solution having equal moles of zirconium and titanium and having a total salt concentration in the range from 0.01 M to about 0.5 M. A stearic dispersant and an organic solvent is added to the mixed salt solution, subjecting the zirconium salt and the titanium salt in the mixed solution to a coprecipitation reaction forming a solution containing amorphous spherical particles of zirconium titanate wherein the volume ratio of the organic solvent to aqueous part is in the range from 1 to 5. The solution of amorphous spherical particles is incubated in an oven at a temperature ?100° C. for a period of time ?24 hours converting the amorphous particles to fine or ultrafine crystalline spherical particles of zirconium titanate.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: May 23, 2006
    Assignee: UT-Battelle, LLC
    Inventor: Michael Z. Hu
  • Patent number: 6827860
    Abstract: Nickel and lead ions are eliminated from an acidic concentrated iron(II) salt solution by adding an alkali sulfide and precipitating nickel and lead sulphides.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: December 7, 2004
    Assignee: Kronos Titan GmbH & Co. OHG
    Inventor: Dieter Schinkitz
  • Patent number: 6806295
    Abstract: Methods for sol-gel processing that generally involve mixing together an inorganic metal salt, water, and a water miscible alcohol or other organic solvent, at room temperature with a macromolecular dispersant material, such as hydroxypropyl cellulose (HPC) added. The resulting homogenous solution is incubated at a desired temperature and time to result in a desired product. The methods enable production of high quality sols and gels at lower temperatures than standard methods. The methods enable production of nanosize sols from inorganic metal salts. The methods offer sol-gel processing from inorganic metal salts.
    Type: Grant
    Filed: September 17, 1999
    Date of Patent: October 19, 2004
    Assignee: UT-Battelle, LLC
    Inventor: Zhong-Cheng Hu
  • Patent number: 6793908
    Abstract: A solution method for preparing indium-tin oxide (ITO) powders is provided. Indium compounds and tin compounds are dissolved in water respectively to form two solution bodies. Some proper additives are added into the solution bodies to form metal hydroxyl compounds with determined composition. After water washing and filtration, proper additives are added into the solution to peptize the solution. During the peptization process, hydrolysis and condensation reactions occurs between different metal hydroxyl compounds. Solvent of the solution is then removed to form high quality nanometer grade ITO powders.
    Type: Grant
    Filed: May 9, 2002
    Date of Patent: September 21, 2004
    Assignee: Cheng Loong Corporation
    Inventors: Hsin Chung Lu, Chio Hao Hsu, I Chiao Lin, Chien Lung Weng
  • Patent number: 6645458
    Abstract: Process for the manufacture of an aqueous sodium chloride solution, according to which a solid material comprising sodium chloride and heavy metals is dispersed in water, the aqueous medium thus obtained is alkalinized so as to precipitate the heavy metals in the form of metal hydroxides, calcium carbonate is coprecipitated with the metal hydroxides in the aqueous medium and the aqueous medium is then subjected to mechanical clarification.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: November 11, 2003
    Assignee: Solvay (Societe Anonyme)
    Inventor: Cédric Humblot
  • Patent number: 6485696
    Abstract: Ozone is used to rapidly oxidize specific metallic elements. The insoluble oxidized compounds of the metals formed by the ozonation are then recovered for industrial use in a conventional sedimentation/filtration tank or pool. There is no requirement for pre-treating or neutralizing the acid mine discharge, even when iron is the dominant metal. If the pH of the untreated acid mine discharge is less than about 2.5, metals other than iron precipitated first. After that, the pH is raised and the iron is precipitated as ferric hydroxide. Aluminum is removed as hydrated aluminum compounds after removal of the iron prior to discharging the acid mine discharge to streams. Both the ozonation and neutralization processes are monitored and controlled using electrochemical sensors and feedback controllers.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: November 26, 2002
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Motoaki Sato, Eleanora I. Robbins
  • Patent number: 6482372
    Abstract: A method for selectively separating and recovering palladium from an aqueous palladium/tin catalyst solution. The method includes the steps of adjusting the pH of the aqueous solution to a specified pH range thereby precipitating the tin, and producing a soluble form a palladium. The solution can be either pre-filtered or settled and subsequently processed through ion exchange resin in a conventional manner, or processed in an upflow direction through an at least partially fluidized bed of ion exchange resin to remove and concentrate the palladium for recovery.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: November 19, 2002
    Assignee: Kinetico Incorporated
    Inventors: Edward Robakowski, Jr., Lyle E. Kirman
  • Patent number: 6482371
    Abstract: A process for the separation of heavy metal and halogen from unwanted waste material or residue. Halogen is selectively extracted or washed out from the waste material. Metal is selectively extracted or washed out from the essentially halogen free waste material.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: November 19, 2002
    Assignee: NKT Research A/S
    Inventor: Erik Rasmussen
  • Patent number: 6442977
    Abstract: A sol-gel process for fabricating bulk, germanium-doped silica bodies useful for a variety of applications, including core rods, substrate tubes, immediate overcladding, pumped fiber lasers, and planar waveguides, is provided. The process involves the steps of providing a dispersion of silica particles in an aqueous quaternary ammonium germanate solution—typically tetramethylammonium germanate, gelling the dispersion to provide a gel body, and drying, heat treating, and sintering the body to provide the germanium-doped silica glass.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: September 3, 2002
    Assignee: Fitel USA Corp.
    Inventors: Suhas Bhandarkar, Frank J McNally, Thomas M Putvinski
  • Patent number: 6436358
    Abstract: A method and apparatus for removing metal contaminants from the spent salt of a molten salt oxidation (MSO) reactor is described. Spent salt is removed from the reactor and analyzed to determine the contaminants present and the carbonate concentration. The salt is dissolved in water, and one or more reagents may be added to precipitate the metal oxide and/or the metal as either metal oxide, metal hydroxide, or as a salt. The precipitated materials are filtered, dried and packaged for disposal as waste or can be immobilized as ceramic pellets. More than about 90% of the metals and mineral residues (ashes) present are removed by filtration. After filtration, salt solutions having a carbonate concentration >20% can be spray-dried and returned to the reactor for re-use. Salt solutions containing a carbonate concentration <20% require further clean-up using an ion exchange column, which yields salt solutions that contain less than 1.0 ppm of contaminants.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: August 20, 2002
    Assignee: The Regents of the University of California
    Inventors: Peter C. Hsu, Erica H. Von Holtz, David L. Hipple, Leslie J. Summers, William A. Brummond, Martyn G. Adamson
  • Patent number: 6423393
    Abstract: A suede-like stitchbonded fabric is disclosed. The stitchbonded fabric includes a nonwoven substrate. A first yarn is stitchbonded into the substrate in a manner that forms loops at the surface of the substrate. A second yarn is then also stitchbonded into the substrate in order to secure the loops to the fabric. Thereafter, the fabric is abraded for substantially breaking all of the loops at the surface of the fabric.
    Type: Grant
    Filed: August 18, 2000
    Date of Patent: July 23, 2002
    Assignee: Tietex International, Ltd.
    Inventor: Martin Wildeman
  • Patent number: 6403045
    Abstract: A method for treating residues derived from garbage and/or industrial waste incineration fumes including the steps of desalting the residues by washing with sodium carbonate in sufficient amount or slightly in excess to solubilize all the salts including the sulphates and precipitate the soluble calcium, the pH being higher than 11, then carrying out a solid/liquid separation to obtain a desalinated cake; leaching the desalinated cake with sodium carbonate in sufficient amount or slightly in excess to obtain, by reaction with the lime present in the cake or added thereto if necessary, the alkalinity required for solubilising amphoteric metals, the pH being higher than 12, and obtaining by solid/liquid separation a cake and a supernatant which is neutralised with carbon dioxide, and filtering the recovered solution to obtain metal hydroxide sludge and an aqueous sodium carbonate solution; and neutralising the resulting residues at a pH between 6.5 and 8.5.
    Type: Grant
    Filed: March 14, 2000
    Date of Patent: June 11, 2002
    Assignee: FIBAC
    Inventors: Daniel Daviller, Laurent Rizet
  • Patent number: 6379635
    Abstract: A process for preparing a nanocrystalline material comprising at least a first ion and at least a second ion different from the first ion, and wherein at least the first ion is a metal ion, is described. The process comprises contacting a metal complex comprising the first ion and the second ion with a dispersing medium suitable to form the nanocrystalline material and wherein the dispersing medium is at a temperature to allow formation by pyrolysis of the nanocrystalline material when contacted with the metal complex.
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: April 30, 2002
    Assignee: Imperial College of Science, Technology & Medicine
    Inventors: Paul O'Brien, Tito Trin Dade
  • Patent number: 6352675
    Abstract: The present invention provides both reagents and a process for removing heavy metals from a caustic fluid stream by the addition of reagents which are not corrosive or deleterious. Specifically, the present invention is directed to removing heavy metals from a Bayer liquor in an aluminum processing plant. The reagents, dithiocarbamate and dithocarbonate groups, are added individually or in combination thereof to the Bayer liquor for the removal of heavy metals, such as zinc. The reagents form a complex with the heavy metal for the precipitation of the metal from the fluid stream. Once a complex is formed, the Bayer liquor is held in a quiescent state for a period of time sufficient for settling out of solution the precipitate. After settling out of solution, the precipitate is separated and removed and the Bayer liquor is then further processed into alumina.
    Type: Grant
    Filed: June 7, 1999
    Date of Patent: March 5, 2002
    Assignee: Nalco Chemical Company
    Inventor: John T. Malito
  • Patent number: 6319482
    Abstract: The present invention relates to a process for treating fly ash/APC residues chlorides, sulphates, earth alkali metals selected from the group consisting of calcium, potassium, and sodium, and heavy metals selected from the group consisting of lead, which residues are obtained from air pollution control processes that utilize dry/semi-dry line injection, such that said residues may be disposed of as non-hazardous materials. The process comprises the sequential steps of: (a) washing and agitating the fly ash/APC residue (20) with water (50) to form a residue slurry containing solubilized lead salts and calcium chloride; (b) filtering (42) the residue slurry to remove a filtrate (46) having a pH of higher than about 11.8 and containing the solubilized lead salts and calcium chloride; and (c) recovering a first calcium enriched filter cake (44).
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: November 20, 2001
    Assignee: Apex Residue Recovery Inc.
    Inventors: Steven E. Sawell, Stephen A. Hetherington
  • Patent number: 6270679
    Abstract: A method is disclosed for recovering and separating precious and non-precious metals from waste streams, which removes, separates, and recovers such metals in a cost effective manner with more than 95% removal from waste streams and with minimal amounts of unprocessed solids and sludge remaining in the environment. Metals such as chromium, manganese, cobalt, nickel, copper, zinc, silver, gold, platinum, vanadium, sodium, potassium, beryllium, magnesium, calcium, barium, lead, aluminum, tin; and the like are removed and recovered from the waste streams with at least 95% removal and other metals and compounds, such as antimony, sulfur, and selenium are removed and recovered from waste streams with at least 50% removal. The method employs a unique complexing agent comprising a carbamate compound and an alkali metal hydroxide which facilitates the formation of the metals into ionic metal particles enabling them to be readily separated, removed and recovered.
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: August 7, 2001
    Inventor: Lawrence Kreisler
  • Publication number: 20010005495
    Abstract: A process for preparing a nanocrystalline material comprising at least a first ion and at least a second ion different from the first ion, and wherein at least the first ion is a metal ion, is described. The process comprises contacting a metal complex comprising the first ion and the second ion with a dispersing medium suitable to form the nanocrystalline material and wherein the dispersing medium is at a temperature to allow formation by pyrolysis of the nanocrystalline material when contacted with the metal complex.
    Type: Application
    Filed: September 9, 1998
    Publication date: June 28, 2001
    Applicant: Paul O'Brien
    Inventors: PAUL O'BRIEN, TITO TRINDADE