Noble Metal Recovered As Free Metal Patents (Class 75/741)
  • Patent number: 11008470
    Abstract: The manufacturing method provided by the present invention is a method for manufacturing core-shell particles that includes core particles and a shell, the constituent metal elements of the foregoing being different from each other. In the present invention, a quinone-containing core particle dispersion containing at least core particles consisting of a first metal, hydroquinone (HQ), benzoquinone (BQ), and a second metal compound including a second metal element for making up the shell is prepared, and a reduction treatment is performed on the quinone-containing core particle dispersion, through addition of a reducing agent, to form a shell including the second metal element as a main constituent element, on the surface of the core particles. A mass ratio: HQ/BQ ratio of added hydroquinone (HQ) and benzoquinone (BQ) is 0.1 to 120.
    Type: Grant
    Filed: October 11, 2019
    Date of Patent: May 18, 2021
    Inventors: Yoshiki Watanabe, Keiko Kato
  • Patent number: 10358692
    Abstract: A hydrometallurgical process is provided for the selective extraction of one or more target metals from ore, concentrates, tailings, slags or other metal bearing solids, by combining simultaneously leaching with sorption in the state of wet solids. The sorption and leaching are performed simultaneously, which reduces the required number of process stages in comparison to conventional technologies. Performing the sorption leaching in wet solids enables a significant increase in the concentration of leaching agents in relation to target metal(s) content in solids, at the same addition rate of said leaching agents, improving thermodynamic conditions and leaching kinetics for dissolving target metal(s). The invention has the main advantage of improving metal recoveries at a reduced consumption rate of leaching agents.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: July 23, 2019
    Assignees: INNOVECO AUSTRALIA PTY. LTD., ORYXEIO INGENIERÍA LIMITADA
    Inventors: Hans Christian Hein, Pavel Spiridonov, Ricardo Oliver Hein Hoernig
  • Patent number: 9343635
    Abstract: There is provided a light-emitting device with enhanced luminescence efficiency, which simultaneously exhibits excitation enhancement and emission enhancement of a light-emitting material by controlling two or multiple surface plasmon resonance bands of anisotropic metal nanoparticles to be formed in a near ultraviolet light range and a visible light range and optimizing overlapping of a wavelength of a near ultraviolet or blue light source with an absorption wavelength and an emission wavelength of the light-emitting material. There is also provided a light-emitting device with improved color gamut and luminance, which simultaneously exhibit emission enhancement of different types of light-emitting materials by controlling two or multiple surfaces plasmon resonance bands of anisotropic metal nanoparticles to be overlapped with absorption and emission wavelengths of two or more light-emitting materials having different emission wavelengths from one another.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: May 17, 2016
    Assignee: HANWHA TOTAL PETROCHEMICAL CO., LTD.
    Inventors: Ki Se Kim, Do Hoon Lee, Ho Sik Chang, Chang Hyun Choi
  • Patent number: 9039804
    Abstract: Nanomaterial preparation methods, compositions, and articles are disclosed and claimed. Such methods can provide nanomaterials with improved morphologies and reduced nitric oxide co-production relative to previous methods. Such materials are useful in electronic applications.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: May 26, 2015
    Assignee: Carestream Health, Inc.
    Inventors: David R. Whitcomb, William D. Ramsden
  • Patent number: 9017449
    Abstract: Nanomaterial preparation methods, compositions, and articles are disclosed and claimed. Such methods can provide nanomaterials with improved morphologies relative to previous methods. Such materials are useful in electronic applications.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: April 28, 2015
    Assignee: Carestream Health, Inc.
    Inventors: David R. Whitcomb, William D. Ramsden, Doreen C. Lynch
  • Patent number: 9017450
    Abstract: Nanomaterial preparation methods, compositions, and articles are disclosed and claimed. Such methods can provide nanomaterials with improved morphologies relative to previous methods. Such materials are useful in electronic applications.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: April 28, 2015
    Assignee: Carestream Health, Inc.
    Inventor: David R. Whitcomb
  • Patent number: 8932384
    Abstract: The invention described relates to the synthesis of gold nanorods in high concentrations in a single batch and their use in detection of nitroexplosives using Surface Enhanced Raman Spectroscopy (SERS). The nanoparticle suspensions were stable up to a month after preparation. The aggregated nanorods have a strong SERS effect for nitroexplosives (3,5-dintro-4-methylbenzoic acid and 2,4,6-TNT) with sensitivity of 5.0 pg in a few seconds. The results obtained in numerous tests demonstrated a high reproducibility that makes aggregated nanorods very attractive substrates for defense and security applications.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: January 13, 2015
    Assignee: University of Puerto Rico
    Inventors: Samuel P. Hernandez-Rivera, Oliva M. Primera-Pedrozo, Ana M. Chamoun-Emanuelli, Wilmarie Medina-Ramos
  • Patent number: 8852777
    Abstract: A method for preparing a redox flow battery electrolyte is provided. In some embodiments, the method includes the processing of raw materials containing sources of chromium ions and/or iron ions. The method further comprises the removal of impurities such as metal ions from those raw materials. In some embodiments, a reductant may be used to remove metal impurities from an aqueous electrolyte containing chromium ions and/or nickel ions. In some embodiments, the reductant is an amalgam. In some embodiments, the reductant is a zinc amalgam. Also provided is a method for removing ionic impurities from an aqueous acid solution. Further provided a redox flow battery comprising at least one electrolyte prepared from the above-identified methods.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: October 7, 2014
    Assignee: Deeya Energy, Inc.
    Inventors: Majid Keshavarz, Aravamuthan Varadarajan
  • Patent number: 8852316
    Abstract: The invention relates to a process for the preparation of silver nano particles comprising dissolving a surfactant in ethanol to obtain a first solution; dissolving a silver precursor in water to obtain a second solution; adding the second solution to the first solution to obtain a third solution; dissolving a reducing agent in water to obtain a reducing agent solution and adding the reducing agent solution to the third solution to obtain silver nano particles.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: October 7, 2014
    Assignee: TATA Chemicals Limited
    Inventors: Murali Sastry, Madakasira Narasimhachary Shashikala, Sumant Phadtare
  • Patent number: 8808420
    Abstract: A process for producing nanoparticles comprises the steps of preparing silver seeds in the presence of a water soluble polyanionic polymer and growing the silver seeds to form nanoparticles. The polyanionic polymer may be poly(sodium styrenesulphonate).
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: August 19, 2014
    Assignee: The Provost, Fellows and Scholars of the College of the Holy and Undivided Trinity of Queen Elizabeth, Near Dublin
    Inventors: Damian John Aherne, Deirdre Marie Ledwith, John Moffat Kelly
  • Patent number: 8741026
    Abstract: Branched nanowire preparation methods, compositions, and articles are disclosed. Such branched nanowires are useful for electronics and optical applications.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: June 3, 2014
    Assignee: Carestream Health, Inc.
    Inventor: David R. Whitcomb
  • Patent number: 8741025
    Abstract: Methods of preparing metal nanowire are disclosed that employ quaternary phosphonium salts. Such processes can produce long and thin nanowires. Compositions and articles comprising such nanowires are useful in electronics applications.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: June 3, 2014
    Assignee: Carestream Health, Inc.
    Inventor: David R. Whitcomb
  • Patent number: 8715387
    Abstract: The process for making silver powder particles with small size crystallites uses a combination of gum arabic and maleic acid with the reduction of a silver salt with ascorbic acid. Silver thick film paste containing these silver powder particles can be used in electronic applications to form electrodes for semiconductor devices and, in particular, solar cells.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: May 6, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Roberto Irizarry, Haixin Yang
  • Patent number: 8636823
    Abstract: A silver salt solution and a reducing agent solution are added to an aqueous dispersing polymer solution to precipitate silver ribbons.
    Type: Grant
    Filed: September 27, 2010
    Date of Patent: January 28, 2014
    Assignee: Ames Advanced Materials Corporation
    Inventor: Jason H. Rouse
  • Patent number: 8613791
    Abstract: This invention relates to a process for obtaining metal values, typically base metals, platinum or gold from a feed material. In a first step of the process of the invention, feed material containing metal values is ground to a particle size d90 of 100 microns or less to form an ultra fine pulp. In a second step of the process of the invention, the ultra fine ground pulp from the first step is oxygenated by pumping it in multiple passes through an in-line high shear static oxygenation device (30), while re-circulating it on a tank (28) or any other vessel. The process of the invention results in a significant reduction in the required leach time, improved recoveries, reduced cyanide consumptions, a steadier gold tail, as well as reduced capital and operational expenditure.
    Type: Grant
    Filed: December 15, 2005
    Date of Patent: December 24, 2013
    Assignee: Maelgwyn Mineral Services Africa (Proprietary) Limited
    Inventors: Adrian Singh, Brian Tinniswood, Michael Battersby, Rainer Imhof
  • Publication number: 20130283976
    Abstract: A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent extraction step using an oxime to obtain a solution of organic solvent containing gold, which is stripped with sodium thiosulphate to recover gold. The extraction may be operated to extract gold with or without iron. Materials used in the process may be recycled. The process avoids environmental and other hazards associated with the use of cyanide to extract gold.
    Type: Application
    Filed: April 8, 2013
    Publication date: October 31, 2013
    Inventors: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, M. A. Halim
  • Patent number: 8551211
    Abstract: Methods of producing metal nanowires employing tubular continuous-flow reactors and their products are described and claimed. Such methods can provide superior nanowire uniformity without agglomeration. Such nanowires are useful for electronic applications.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: October 8, 2013
    Assignee: Carestream Health, Inc.
    Inventors: Richard R. Oilmann, William D. Ramsden, Doreen C. Lynch
  • Patent number: 8512438
    Abstract: Described herein are methods of controlling metal nanowire morphologies by adjusting the reaction conditions of a polyol synthesis. In particular, by purging the reaction with an inert gas, batch-to-batch consistency can be achieved.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: August 20, 2013
    Assignee: Cambrios Technologies Corporation
    Inventors: Rimple Bhatia, Jelena Sepa, Frank Wallace
  • Publication number: 20130108525
    Abstract: A method for separating an amount of osmium from a mixture containing the osmium and at least one other additional metal is provided. In particular, method for forming and trapping OsO4 to separate the osmium from a mixture containing the osmium and at least one other additional metal is provided.
    Type: Application
    Filed: August 3, 2012
    Publication date: May 2, 2013
    Applicant: THE CURATORS OF THE UNIVERSITY OF MISSOURI
    Inventors: Hendrik P. Engelbrecht, Cathy S. Cutler, Leonard Manson, Stacy Lynn Wilder
  • Patent number: 8372178
    Abstract: There is disclosed a silver powder comprising silver particles, each said silver particle comprising silver components 100-500 nm long, 80-100 nm wide, and 80-100 nm thick, assembled on the surface of silver to form a spherically-shaped, open structured particle, wherein the surface of the particle resembles the surface of an orange rind and the d50 particle size is from about 2.5 ?m to about 6 ?m. Also disclosed is a process for making these silver particles. The silver particles formed are particularly useful in electronic applications.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: February 12, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventor: Roberto Irizarry
  • Patent number: 8366799
    Abstract: Silver powders containing particles with a different morphology are disclosed. The silver particles are spherically-shaped with an open structure surface. The majority of the spherically-shaped silver particles have one or more silver plates attached to each of the majority of the spherically-shaped silver particles. Also provided is a process for making these silver particles. The silver particles formed are particularly useful in electronic applications.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: February 5, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventor: Roberto Irizarry
  • Patent number: 8323377
    Abstract: A process for recovering a target metal from an oxidized metalliferous material comprises the steps of: in an acid generation stage, adding sulfuric acid to a solution comprising a metal halide to generate an acidic aqueous halide solution; in a leaching stage that is separate to the acid generation stage, leaching the oxidized metalliferous material with the acidic aqueous halide solution to leach the target metal into solution; passing the solution from the leaching stage to a target metal recovery stage in which the target metal is recovered from the solution while the metal halide is retained in solution; and returning the solution with the metal halide therein from the target metal recovery stage to the acid generation stage.
    Type: Grant
    Filed: March 24, 2005
    Date of Patent: December 4, 2012
    Assignee: Intec, Ltd.
    Inventors: John Moyes, Frank Houllis, Andrew Tong
  • Patent number: 8231704
    Abstract: A silver powder comprising silver particles, each silver particle comprising silver components 100-2000 nm long, 20-100 nm wide and 20-100 nm thick assembled to form a spherically-shaped, open-structured particle, wherein the d50 particle size is from about 2.5 ?m to about 6 ?m is disclosed. Also disclosed is a process for making these silver particles. The silver particles formed are particularly useful in electronic applications.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: July 31, 2012
    Assignee: E I du Pont de Nemours and Company
    Inventor: Roberto Irizarry
  • Publication number: 20110308356
    Abstract: The method for sorptive extraction of precious metals from mineral raw materials containing alkaline and alkaline earth metal chlorides relates to hydrometallurgy and can be used for extracting precious metals (palladium, platinum, gold and silver) from different types of raw mineral materials. It includes sorption of precious metals from a pulp using a synthetic sorbent that contains strong and weak base functional groups, followed by desorption. Sorbent is washed in two stages with the liquid phase of the waste pulp and water, and then precious metals are desorbed using a hydrochloric acid solution of thiourea. Precious metals are precipitated from the thiourea solution into a collective concentrate using an ammonium hydroxide solution. The process is carried out in a cascade of six devices with screen drainages with a fixed volume of sorbent load in each device. Precious metals are desorbed at 50-60° C. using a solution containing thiourea and hydrochloric acid.
    Type: Application
    Filed: September 8, 2009
    Publication date: December 22, 2011
    Inventors: Izabella Alekseevna Logvinenko, Tatyana Veniaminovna Vlasova, Andrei Filippovich Smetannikov, Arkadiy Evgenievich Krasnoshtein, Tatyana Froyanovna Weitzman
  • Patent number: 8052774
    Abstract: Disclosed herein is a method for concentrating gold contained in a leach residue obtained in a copper hydrometallurgical process for recovering copper from a copper sulfide mineral to efficiently separate and recover gold from the leach residue: a gold-bearing copper sulfide mineral is subjected to pressure leaching with sulfuric acid at a temperature higher than 102° C. and 112° C. or lower to obtain a leach residue, and the leach residue is subjected to flotation to separate it into a float fraction and a sink fraction; the float fraction obtained by flotation is desulfurized to obtain a desulfurized product; the desulfurized product is subjected to oxidative roasting to obtain an oxidatively-roasted product; the oxidatively-roasted product is dissolved in a sulfuric acid solution to obtain a copper solution, and a gold-bearing residue is separated and recovered from the copper solution.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: November 8, 2011
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Noriyuki Nagase, Satoshi Asano, Masatoshi Takano, Kenji Takeda, Shinichi Heguri, Atsushi Idegami
  • Patent number: 7976609
    Abstract: A method for manufacturing metal nanorods includes: a step of adding a reducing agent to a metallic salt solution; a step of radiating light into the metallic salt solution containing the reducing agent; and a step of leaving the light-radiated metallic salt solution containing the reducing agent stationary in a dark place so as to grow metal nanorods. Metal nanorods can be also grown by forming a mixed solution by fractionating the above light-radiated metallic salt solution and mixing the fractionated metallic salt solution into a non-radiated metallic salt solution containing the reducing agent, or mixing a non-radiated metallic salt solution and the reducing agent into the above light-radiated metallic salt solution; and leaving the mixed solution stationary in a dark place so as to grow metal nanorods.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: July 12, 2011
    Assignees: Mitsubishi Materials Corporation, Dai Nippon Toryo Co., Ltd.
    Inventors: Yasuro Niidome, Sunao Yamada, Koji Nishioka, Hideya Kawasaki, Hiroki Hirata, Daigou Mizoguchi, Yoshiaki Takata, Jun-etsu Satoh, Masaoki Ishihara, Masanori Nagai, Masato Murouchi
  • Patent number: 7972413
    Abstract: A method for recovering precious metals such as gold and silver from aqueous solution as solid is described The method includes mixing an aqueous solution (e.g, thiosulfate or thiocyanate lixiviant) containing precious metals with ferrous ions in the presence of an effective amount of hydroxide ions. The precious metal ions are reduced and co-precipitate with iron hydroxides and/or hydrated iron oxides The co-precipitate is collected and purified. De-oxygenation of the reaction solution is optional. The recover/method is fast, complete and clean.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: July 5, 2011
    Assignee: Metal Asia International Ltd.
    Inventor: Chen Xia
  • Patent number: 7964015
    Abstract: An improved process and composition for the extraction of metal from a metal-laden ore, soil or rock is provided. A liquid, three-component aqueous lixiviant comprises water, an alkali metal salt and a low pH acidic composition. A four-component aqueous lixiviant comprises water, a low pH acidic composition, an alkali metal salt and an acid having a pH value less than 2. Both lixiviant compositions are efficient for extracting metal into a pregnant liquid solution. The pregnant solution is treated by known conventional means, such as filtration, centrifuging or electrolysis to remove the extracted metals. The three-component and four-component aqueous lixiviants of the present invention are non-toxic, meaning, not an irritant or deleterious to humans or the environment and perform, as well as, or better than known toxic cyanide lixiviants.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: June 21, 2011
    Assignee: Contact Marketing Solutions, LLC
    Inventors: David H. Creasey, Edwin B. Smith, Jr.
  • Publication number: 20110132146
    Abstract: An object is to provide a method and an apparatus for recovering indium, the method and apparatus ensuring that it is unnecessary to recover indium in the form of indium hydroxide, indium can be recovered at a high concentration, indium can be recovered easily by a filter or the like without handling inferiors and also, the recovery rate of indium is greatly improved. The method includes adding a precipitation-inducing metal including a metal having higher ionization tendency than indium to an etching waste solution containing at least indium and ferric chloride, in which the concentration of ferric chloride is adjusted to 20% by weight or less to thereby precipitate indium contained in the etching waste solution on the surface of the precipitation-inducing metal, then, detaching the indium precipitated on the precipitation-inducing metal from the precipitation-inducing metal by a detaching means and separating the detached solid indium or indium alloy from the solution to recover the indium.
    Type: Application
    Filed: November 19, 2007
    Publication date: June 9, 2011
    Applicants: SHARP KABUSHIKI KAISHA, KOBELCO ECO-SOLUTIONS CO., LTD.,
    Inventors: Takeo Miki, Tamotsu Sugimoto, Eiichi Sahashi, Takamichi Honma, Tomoharu Maeseto
  • Patent number: 7935173
    Abstract: A hydrometallurgical process for the recovery of metals selected from the group consisting of platinum, palladium, rhodium, ruthenium, iridium, and gold (PM) from solids includes dissolving the PM and base metals in an acidic halide aqueous solution and precipitating the PM using substituted quaternary ammonium salts (SQAS). PM having multiple oxidation states may be oxidized or reduced to separate through differential solubility. Au-SQAS is separated by washing the precipitate with a suitable organic solvent. Rh-SQAS and other PM with multiple oxidation states are dissolved in a strong halide acid solution and oxidized to separate soluble Rh. Pb and Pd are separated by boiling the initial acidic halide aqueous solution of metals in an excess of SQAS. The Pb and Pd filtrate is oxidized and then Pd-SQAS is dissolved in aqueous ammonia and separated from insoluble Pb. A slurry of Ir-SQAS and Pt-SQAS are separated through dissolution of Ir-SQAS with NaNO2.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: May 3, 2011
    Assignee: Metals Recovery Technology Inc.
    Inventors: Joseph L. Thomas, Gerald F. Brem
  • Patent number: 7922787
    Abstract: Embodiments of the present invention are directed to novel methods for the solution-based production of silver nanowires by adaptation of the polyol process. Some embodiments of the present invention can be practiced at lower temperature and/or at higher concentration than previously described methods. In some embodiments reactants are added in solid form rather than in solution. In some embodiments, an acid compound is added to the reaction.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: April 12, 2011
    Assignee: Seashell Technology, LLC
    Inventors: Yuliang Wang, Janet Cravens Dickerson
  • Patent number: 7918918
    Abstract: Provided is a novel extractant for palladium capable of improving an extraction rate compared to the conventional extractant, DHS, and also capable of back-extracting palladium using an ammonia solution, and a method of separating and recovering palladium using the novel extractant.
    Type: Grant
    Filed: January 9, 2009
    Date of Patent: April 5, 2011
    Assignee: National Institute of Advanced Industrial Science & Technology
    Inventors: Hirokazu Narita, Mikiya Tanaka, Ken Tamura
  • Patent number: 7892317
    Abstract: In present invention, colloidal nanosilver has been prepared with high affect on bacteria, viruses, and fungi. The average size of nano particles are less than 10 nm. In the present invention colloidal nanosilver is subject to synthesis by a very simple method and in a short time. Nanosilver colloid prepared by use of different surfactant like LABS, Tween 20, Tween 60, Tween 80, SDS.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: February 22, 2011
    Inventor: Jafar Rahman Nia
  • Patent number: 7744834
    Abstract: A method for manufacturing metal nanoparticles, the method including forming a mixture by dissociating a metallic salt of a metal selected from the group consisting of Ag, Pd, Pt, Au and an alloy thereof as a metal precursor in fatty acid; and adding a metallic salt of a metal selected from the group consisting of Sn(NO3)2, Sn(CH3CO2)2, and Sn(acac)2 as a metallic catalyst into the mixture and mixing the mixture and the metallic salt. According to the method, metal nanoparticles have a uniform particle size distribution and a high yield by performing in a non-aqueous environment without using any organic solvent, and are environmentally friendly due to no use of a reducing agent.
    Type: Grant
    Filed: April 13, 2007
    Date of Patent: June 29, 2010
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Kwi-Jong Lee, Jae-Woo Joung, Byung-Ho Jun
  • Publication number: 20100143781
    Abstract: A method for preparing a redox flow battery electrolyte is provided. In some embodiments, the method includes the processing of raw materials containing sources of chromium ions and/or iron ions. The method further comprises the removal of impurities such as metal ions from those raw materials. In some embodiments, a reductant may be used to remove metal impurities from an aqueous electrolyte containing chromium ions and/or nickel ions. In some embodiments, the reductant is an amalgam. In some embodiments, the reductant is a zinc amalgam. Also provided is a method for removing ionic impurities from an aqueous acid solution. Further provided a redox flow battery comprising at least one electrolyte prepared from the above-identified methods.
    Type: Application
    Filed: December 4, 2009
    Publication date: June 10, 2010
    Inventors: Majid KESHAVARZ, Aravamuthan Varadarajan
  • Patent number: 7691346
    Abstract: A method is shown for raising the pH of a cyanide leach solution of the type used in a heap leaching mining operation. Lime slurry is mixed with a side stream of barren cyanide solution in a reactor vessel in order to remove carbonate hardness, to regenerate the hydroxide alkalinity and to raise the pH of the resulting recausticized leach solution. A portion of the calcium carbonate precipitate formed in the reactor vessel is retained in order to encourage further crystal growth. Overflow from the reactor vessel passes through one or more cyclone separation stages in order to remove particulate solids. A cyclone overflow stream is directed back to the process to upwardly adjust the pH of the bulk of the barren cyanide solution. A cyclone underflow stream is directed back to the reactor vessel to provide seed crystal nuclei for precipitate growth.
    Type: Grant
    Filed: June 19, 2007
    Date of Patent: April 6, 2010
    Assignee: Chemical Lime Company
    Inventors: Starr Curtis, Jeff DiGulio, Jim Ramey
  • Patent number: 7585349
    Abstract: Methods for forming nanostructures of various shapes are disclosed. Nanocubes, nanowires, nanopyramids and multiply twinned particles of silver may by formed by combining a solution of silver nitrate in ethylene glycol with a solution of poly(vinyl pyrrolidone) in ethylene glycol. Hollow nanostructures may be formed by reacting a solution of solid nanostructures comprising one of a first metal and a first metal alloy with a metal salt that can be reduced by the first metal or first metal alloy. Nanostructures comprising a core with at least one nanoshell may be formed by plating a nanostructure and reacting the plating with a metal salt.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: September 8, 2009
    Assignee: The University of Washington
    Inventors: Younan Xia, Yugang Sun
  • Patent number: 7582136
    Abstract: A process for the recovery of gold from a potassium iodide-iodine solution is provided. The gold is precipitated from the solution using a weak acid, (e.g. ascorbic acid), a buffer, (e.g. sodium bicarbonate), and a dye. The precipitate is then removed from the solution resulting in the recovery the gold precipitate and the potassium iodide-iodine solution.
    Type: Grant
    Filed: March 28, 2007
    Date of Patent: September 1, 2009
    Assignee: Union Etchants International, Inc.
    Inventor: Robert E. Union
  • Publication number: 20090178513
    Abstract: Provided is a novel extractant for palladium capable of improving an extraction rate compared to the conventional extractant, DHS, and also capable of back-extracting palladium using an ammonia solution, and a method of separating and recovering palladium using the novel extractant.
    Type: Application
    Filed: January 9, 2009
    Publication date: July 16, 2009
    Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Hirokazu Narita, Mikiya Tanaka, Ken Tamura
  • Patent number: 7559971
    Abstract: The invention relates to a method for removing silver from a chloride solution in a copper recovery process. According to this method, silver is removed using fine-grained copper powder and mercury. Silver removal occurs in at least two stages and mercury is fed into the solution at a certain molar ratio with regard to the silver in the solution.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: July 14, 2009
    Assignee: Outotec Oyj
    Inventors: Olli Hyvärinen, Marika Jyrälä
  • Patent number: 7547348
    Abstract: The invention relates to a method for the recovery of metals, in particular copper, from a copper-bearing raw material, whereby the material is leached into a chloride-containing solution. The leaching of the raw material is performed oxidatively and at a sufficiently high redox potential that the copper in the copper chloride solution from leaching is mainly divalent. The chloride solution obtained, which contains copper and potentially other valuable metals, is fed to liquid-liquid extraction. In the extraction the copper is first transferred to the organic phase with extraction and then to a sulphate solution in stripping, which is fed to copper electrowinning.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: June 16, 2009
    Assignee: Outotec OYJ
    Inventors: Stig-Erik Hultholm, Olli Hyvärinen
  • Publication number: 20090038440
    Abstract: The invention relates to a method for recovering gold from a sulphidic concentrate, particularly one containing arsenopyrite and/or pyrite, hydro-metallurgically. The concentrate is first subjected to leaching with a concentrated solution of alkali chloride and copper (II) chloride, by means of which the copper minerals and some of the gold in the concentrate are made to dissolve. Elemental sulphur and precipitated iron and arsenic compounds are separated from the leaching residue using physical separation methods, whereby the first intermediate is obtained, which contains gold-bearing sulphide minerals and gangue minerals as well as the gold that remains undissolved. The free gold that remains undissolved is separated by means of gravity separation methods. After gravity separation, additional comminution is carried out, after which the sulphide minerals are decomposed and the gold-containing solution or residue is routed to the concentrate leaching circuit.
    Type: Application
    Filed: February 14, 2006
    Publication date: February 12, 2009
    Applicant: Outotec Oyi
    Inventors: Matti Hamalainen, Tuula Hamalainen, Jaakko Leppinen, Olli Hyvarinen, Seppo Heimala, Veikko Palosaari
  • Patent number: 7429286
    Abstract: A method of recovering precious metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from a crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refractory sulfide minerals from the separated fines and adding the concentrate to the heap, bioleaching the heap to thereby oxidize iron sulfides contained therein, and hydrometallurgically treating the bioleached ore to recover precious metal values contained therein.
    Type: Grant
    Filed: January 2, 2007
    Date of Patent: September 30, 2008
    Assignee: Geobiotics, LLC
    Inventor: William J. Kohr
  • Patent number: 7291202
    Abstract: A process for mutual separation of platinum group metals (PGM), wherein highly stable compounds and steps are used to efficiently remove impurity elements while preventing increase of impurity content relative to that of the PGM in the mother liquor and also preventing decomposition of a chloro complex, and palladium, platinum, iridium, ruthenium and rhodium are separated mutually in such a way that each of the separated PGM has a sufficient purity to be a commercial product.
    Type: Grant
    Filed: September 21, 2004
    Date of Patent: November 6, 2007
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Satoshi Asano, Shinichi Heguri, Yoshiaki Manabe, Masushi Kasai, Harumasa Kurokawa
  • Patent number: 7214644
    Abstract: A method for producing a copper/palladium colloid catalyst useful for Suzuki couplings.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: May 8, 2007
    Assignee: Xerox Corporation
    Inventors: Jennifer A. Coggan, Nan-Xing Hu, H. Bruce Goodbrand, Timothy P. Bender
  • Patent number: 6958308
    Abstract: A method for producing dispersed metal particles on a substrate and the compositions produced is disclosed. A method for producing the particles comprises exposing an organometallic and a particulate substrate to supercritical or near supercritical fluid under conditions to form a mixture of the fluid and the organometallic, allowing the mixture to remain in contact with the substrate for a time sufficient to deposit dispersed organometallic onto the substrate, venting the mixture, thereby adsorbing the organometallic onto the substrate, and reducing the dispersed organometallic to dispersed metal particles with a reducing agent.
    Type: Grant
    Filed: March 16, 2004
    Date of Patent: October 25, 2005
    Assignee: Columbian Chemicals Company
    Inventor: Garth Desmond Brown
  • Publication number: 20040173056
    Abstract: An improved method for plating an organic substrate with silver is disclosed. Improved plating is achieved in part through the use of Na4EDTA, which facilitates improved grain formation and recovery of silver from waste material. Articles prepared using the method of the invention are also disclosed.
    Type: Application
    Filed: September 19, 2003
    Publication date: September 9, 2004
    Inventors: William F. McNally, Satish Chandra, Vinesh Naik, Joel M. Furey
  • Publication number: 20040118248
    Abstract: A method to dissolve at least one metal from jarosite or other iron hydroxyl sulphate containing-material which includes the steps of subjecting the material to alkaline treatment in a brine solution to facilitate jarosite decomposition, and acidification of the brine slurry to solubilise the liberated metal.
    Type: Application
    Filed: September 8, 2003
    Publication date: June 24, 2004
    Inventors: Noelene Ahern, Jozef Maria Schaekers
  • Patent number: 6652623
    Abstract: In a method for working up a gold bath or a gold alloy bath, which contains gold in the form of a gold sulphite complex, working up takes place through at least one oxidant, which oxidizes the sulphite contained in the complex and reduces the gold contained in the complex to its metallic form. In the method in particular hydrogen peroxide and potassium-peroxo-monosulphate are used as oxidants. The oxidants are provided in a kit.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: November 25, 2003
    Assignee: Wieland Dental + Technik GmbH & Co. KG
    Inventors: Waldemar Mzyk, Susanne Ruebel
  • Publication number: 20030200839
    Abstract: A process for the selective recovery of precious metals from a medium loaded with precious metals and base metals. The selective recovery of precious metals is achieved by exposing the medium to an aqueous solution containing a complex of formula MX2—, wherein M is a metal of group IB or IIB of the Periodic Table of Elements, and X is a monovalent radical. A second invention relates to the removal of copper from the medium whereby elution of copper is achieved by exposing the medium to an aqueous solution capable of oxidising Cu(I) to Cu(II) whilst not eluting precious metals from the medium.
    Type: Application
    Filed: March 11, 2003
    Publication date: October 30, 2003
    Inventors: Alexander E. Jenkins, Tam Tran