Extracting, Leaching, Or Dissolving Patents (Class 423/658.5)
  • Patent number: 10544481
    Abstract: The invention relates to a method for the recovery of precious metal from materials containing precious metal, said method comprises the following steps of: A) bringing the materials containing the precious metal into contact with an oxidizing agent, B) bringing the material containing the precious metal into contact with a reducing agent. Said method offers the possibility of recovering precious metal in a simple manner and in high purity from secondary materials.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: January 28, 2020
    Assignee: Max-Planck-Institut für Eisenforschung GmbH
    Inventors: Nejc Hodnik, Claudio Baldizzone, Karl Mayrhofer
  • Patent number: 10023935
    Abstract: A method of improving metal leach kinetics and recovery during atmospheric or substantially atmospheric leaching of a metal sulfide is disclosed. In some embodiments, the method may comprise the steps of: (a) producing a metal sulfide flotation concentrate; (b) processing the metal sulfide concentrate in a reductive activation circuit that operates at a first redox potential, to produce a reductively-activated metal sulfide concentrate; and, (c) subsequently processing the activated metal sulfide concentrate in an oxidative leach circuit to extract metal values. In some disclosed embodiments, reductive activation steps may be employed prior to oxidative leaching steps (including heap leap leaching or bio-leaching steps). In some embodiments, physico-chemical processing steps may be employed during reductive activation and/or oxidative leaching. Systems for practicing the aforementioned methods are also disclosed.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: July 17, 2018
    Assignee: FLSmidth A/S
    Inventors: David J. Chaiko, Frank Baczek, Tom Walters, Sarah (Sally) Rocks, Carlos Eyzaguirre
  • Patent number: 9611196
    Abstract: The present invention relates to a process for obtaining food grade hexane, comprising: fractionating a hydrocarbon feed having a boiling point in the range of 50° C. to 140° C. to obtain a hydrocarbon fraction having boiling point in the range of 63° C. to 69° C. and having 3%-15% (wt/wt) of aromatic compounds content; extracting the hydrocarbon fraction by counter current solvent extraction using sulfolane as a solvent to obtain a first raffinate phase; extracting the first raffinate phase by co-current solvent extraction using sulfolane as a solvent to obtain a second raffinate phase; and washing the second raffinate phase with water to obtain a food grade hexane containing less than 100 ppm of aromatic compounds.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: April 4, 2017
    Assignee: BHARAT PETROLEUM CORPORATION LTD
    Inventors: Pragya Rai, Jose Nehamiah, Chiranjeevi Thota, Dattatraya Tammannashastri Gokak, Poyyamani Swaminathan Viswanathan, Shashikant Shukla, Buddhadeb Kundu, Satish Kumar Goel
  • Patent number: 9278316
    Abstract: A liquid membrane matrix is disclosed in the form of an aquaporin containing bulk liquid membrane matrix (BLM), wherein said liquid membrane matrix is formed from a solution of an amphiphilic copolymer detergent wherein transmembrane proteins have been functionally incorporated and wherein said matrix further contains a stabilizing oil phase. The uses of the membrane matrix include water extraction from liquid aqueous media by forward osmosis, e.g. for desalination of salt water.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: March 8, 2016
    Assignee: AQUAPORIN A/S
    Inventors: Thomas Vissing, Jesper Søndergaard Hansen
  • Patent number: 9212069
    Abstract: A fluid (i.e., generally water or wastewater) treatment system and associated methods provide for effectively treating the fluid (i.e., generally water or wastewater containing at least a plurality of salts) to provide a separated pure fluid (i.e., generally water) and a separated impurity (i.e., generally a salt). Also provided are a method for detecting or determining the need for a controlled process intervention to prevent the plugging of system components in a fluid (i.e., generally water) treatment system, and a process for preventing the plugging of the system components in the fluid (i.e., generally water) treatment system.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: December 15, 2015
    Assignee: Salt Water Solutions, LLC
    Inventors: Jay N. Smtih, Samuel W. Gowan
  • Patent number: 9169533
    Abstract: The present disclosure relates to a metal recovery process comprising a solvent extraction process. In an exemplary embodiment, the solution extraction system comprises a plant with a first and second circuit. A high-grade pregnant leach solution (“HGPLS”) is provided to the first and second circuit, and a low-grade pregnant leach solution (“LGPLS”) is provided to the second circuit. The first circuit produces a rich electrolyte, which can be forwarded to a primary metal recovery, and a low-grade raffinate, which can be forwarded to a secondary metal recovery process. The second circuit produces a rich electrolyte, which can also be forwarded to the primary metal recovery process. The first and second circuits are in fluid communication with each other.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: October 27, 2015
    Assignee: FREEPORT MINERALS CORPORATION
    Inventors: Jason M Morgan, Barbara J Savage, David G Meadows, Wayne W Hazen
  • Patent number: 9115419
    Abstract: A process for the extraction of rare earth elements, including yttrium, from a rare earth element-bearing ore or concentrate, comprising the steps of leaching the rare earth element-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of from 90° C. to the boiling point of the solution and at an Eh of at least 200 mV. After a liquid/solids separation step, the solution obtained is subjected to steps for removal of iron and for recovery of rare earth elements. Alternatively, rare earth element-bearing ore or concentrate may be leached with sulphuric acid and liquid obtained subjected to extraction of iron and other impurities. Raffinate obtained may be treated with oxalic acid, the precipitate dissolved in hydrochloric acid and subjected to solvent extraction for rare earth elements or the raffinate may be subjected to solvent extraction for removal of rare earth elements and then stripped with hydrochloric acid.
    Type: Grant
    Filed: April 8, 2013
    Date of Patent: August 25, 2015
    Assignee: PROCESS RESEARCH ORTECH INC.
    Inventors: Vaikuntam I. Lakshmanan, Ramamritham Sridhar, M. A. Halim
  • Patent number: 9023313
    Abstract: The present disclosure relates to a process and system for recovery of one or more metal values using solution extraction techniques and to a system for metal value recovery. In an exemplary embodiment, the solution extraction system comprises a first solution extraction circuit and a second solution extraction circuit. A first metal-bearing solution is provided to the first and second circuit, and a second metal-bearing solution is provided to the first circuit. The first circuit produces a first rich electrolyte solution, which can be forwarded to primary metal value recovery, and a low-grade raffinate, which is forwarded to secondary metal value recovery. The second circuit produces a second rich electrolyte solution, which is also forwarded to primary metal value recovery. The first and second solution extraction circuits have independent organic phases and each circuit can operate independently of the other circuit.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: May 5, 2015
    Assignee: Freeport Minerals Corporation
    Inventors: Anand Raman, Jason M Morgan, Barbara J Savage, David G Meadows, Wayne W Hazen
  • Patent number: 8999034
    Abstract: Disclosed are methods and compositions for improving metal extraction processes by introducing at least one cationically charged compound selected from a group consisting of amines, particularly quaternary amines such as alkyldimethylbenzylammonium chlorides (ADBAC compounds), polyamines and other suitable cationic organic materials, and mixtures thereof, for neutralizing and/or coagulating excess anionic organic compounds including, for example, flotation reagents, surfactants, polymers, flotation reagent by-products and/or anti-scalant additives found in metal concentrate streams, and thereby reduce the downstream fouling of the activated carbon by these compounds.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: April 7, 2015
    Assignee: Chemtreat, Inc.
    Inventors: John Richardson, Robert Bedinger, Kevin Gottschalk
  • Patent number: 8968698
    Abstract: Provided herein are processes for recovering molybdenum and/or other value metals (e.g., uranium) present in aqueous solutions from a large range of concentrations: from ppm to grams per liter via a solvent extraction process by extracting the molybdenum and/or other value metal from the aqueous solution by contacting it with an organic phase solution containing a phosphinic acid, stripping the molybdenum and/or other value metal from the organic phase solution by contacting it with an aqueous phase strip solution containing an inorganic compound and having a ?1.0 M concentration of free ammonia, and recovering the molybdenum and/or other value metal by separating it from the aqueous phase strip solution. When the molybdenum and/or other value metal are present only in low concentration, the processes can include an organic phase recycle step and/or an aqueous phase strip recycle step in order to concentrate the metal prior to recover.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: March 3, 2015
    Assignee: Cytec Technology Corp.
    Inventors: Troy Allan Bednarski, Violina Antoneta Cocalia, Matthew Dean Soderstrom, Eduardo Alberto Kamenetzky, Andrew Michael Cameron, Douglas Harris
  • Patent number: 8961795
    Abstract: The invention relates to an apparatus and method for removing molybdenum and other possible impurities from an organic copper-containing extraction solution in connection with the liquid-liquid extraction related to copper recovery. The removal of impurities occurs in one or several removal units built into the organic extraction solution storage tank.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: February 24, 2015
    Assignee: Outotec Oyj
    Inventors: Hannu Laitala, Erkki Paatero, Bror Nyman, Eero Ekman
  • Patent number: 8920773
    Abstract: Various embodiments provide a process roasting a metal bearing material under oxidizing conditions to produce an oxidized metal bearing material, roasting the oxidized metal bearing material under reducing conditions to produce a roasted metal bearing material, leaching the roasted metal hearing material in a basic medium to yield a pregnant leach solution, conditioning the pregnant leach solution to thrill a preprocessed metal bearing material; and leaching the preprocessed metal bearing material in acid medium.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: December 30, 2014
    Assignee: Freeport Minerals Corporation
    Inventors: Joanna M. Robertson, Thomas R. Bolles, Wayne W. Hazen, Lawrence D. May, Jay C. Smith, David R. Baughman
  • Patent number: 8852549
    Abstract: Provided are methods for maintaining the ratio of the oxime to equilibrium modifier concentration in solvent extraction circuits, said solvents essentially consisting of at least one ketoxime and/or aldoxime; at least one equilibrium modifier; and at least one diluent.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: October 7, 2014
    Assignee: BASF Corporation
    Inventors: Michael Virnig, Jack Bender, Nathan C. Emmerich
  • Publication number: 20140264147
    Abstract: Heat transfer compositions, methods and use wherein the composition comprising: (a) from about 5 to about 20% by weight of HFC-32; (b) from about 70% to about 90% by weight of HFO-1234ze; and (c) from about 5% to less than about 20% by weight of HFC-152a and/or HFC-134a.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Inventors: SAMUEL F. YANA MOTTA, MARK W. SPATZ, CHRISTOPHER J. SEETON
  • Patent number: 8828353
    Abstract: The present invention relates generally to a process for controlled leaching and sequential recovery of two or more metals from metal-bearing materials. In one exemplary embodiment, recovery of metals from a leached metal-bearing material is controlled and improved by providing a high grade pregnant leach solution (“HGPLS”) and a low grade pregnant leach solution (“LGPLS”) to a single solution extraction plant comprising at least two solution extractor units, at least two stripping units, and, optionally, at least one wash stage.
    Type: Grant
    Filed: January 8, 2013
    Date of Patent: September 9, 2014
    Assignee: Freeport Minerals Corporation
    Inventors: Barbara J. Savage, David G. Meadows, Wayne W. Hazen
  • Patent number: 8801855
    Abstract: Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: August 12, 2014
    Assignee: Silicor Materials Inc.
    Inventor: Scott Nichol
  • Publication number: 20140222699
    Abstract: The invention provides a heat transfer composition comprising up to about 30% by weight carbon dioxide (R-744), from about 30% to about 80% by weight difluoromethane (R-32), and 1,3,3,3-tetrafluoropropene (R-1234ze).
    Type: Application
    Filed: August 2, 2012
    Publication date: August 7, 2014
    Inventor: Robert Elliott Low
  • Patent number: 8765480
    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: Grant
    Filed: April 2, 2012
    Date of Patent: July 1, 2014
    Assignee: ARKRAY, Inc.
    Inventor: Yuka Shimomura
  • Publication number: 20140178272
    Abstract: In one embodiment, the present disclosure provides an extraction method. A conduit is formed in a heap-leach pad. The heap-leach pad includes a plurality of poorly perfused areas. The conduit is in fluid communication with poorly perfused areas of the heap-leach pad. A fluid that includes steam is injected into the conduit. The fluid travels through the heap-leach pad and condenses in poorly perfused areas of the heap-leach pad. An extraction solution is applied to the heap-leach pad. Condensation of steam in the poorly perfused areas of the heap-leach pad provides new flow pathways for the extraction solution.
    Type: Application
    Filed: December 13, 2013
    Publication date: June 26, 2014
    Applicant: Board of Regents of the Nevada System of Higher Education, on behalf of the Desert Research Insti.
    Inventor: David Decker
  • Patent number: 8734757
    Abstract: A process for producing a mineral concentrate product that at is at least a substantially odor-free product comprises any one or more than one of (a) organics removal by (i) treatment of a froth product slurry containing floated mineral particles to remove organic compounds from the mineral particles and/or (ii) thermal treatment, and (b) addition of chemicals to prevent residual organic compounds on mineral concentrates being converted to odorous compounds, particularly while the concentrates are being stock-piled or transported.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: May 27, 2014
    Assignee: BHP Billiton SSM Development Pty Ltd.
    Inventors: Chris du Plessis, Geoffery David Senior
  • Publication number: 20140124699
    Abstract: A heat transfer composition comprising trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)), carbon dioxide (R-744) and a third component selected from difluoromethane (R-32), 1,1-difluoroethane (R-152a), fluoroethane (R-161), 1,1,1,2-tetrafluoroethane (R-134a), propylene, propane and mixtures thereof.
    Type: Application
    Filed: January 13, 2014
    Publication date: May 8, 2014
    Applicant: Mexichem Amanco Holding S.A. DE C.V.
    Inventor: Robert E. Low
  • Patent number: 8685164
    Abstract: Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: April 1, 2014
    Assignee: Silicor Materials Inc.
    Inventor: Scott Nichol
  • Patent number: 8652640
    Abstract: The present invention includes an article of manufacture or device, or related system, comprising a heterogeneous surface for selective analyte sensing or separation. Such an article can comprise a surface member and a plurality of spaced components extending therefrom and coupled thereto, such a surface member and spaced components providing a surface heterogeneity selected from different electrostatic interactions, different non-electrostatic interactions and a combination of such interactions, such that the interactions are at least partially sufficient for selective analyte interaction and/or separation. Each such component extension can be of a nanometer dimension about the Debye length of a medium comprising an analyte particle exposed to such a surface. An analyte particle, optionally of a mixture of particles, can be dimensioned from about 30 nm to 20 ?m.
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: February 18, 2014
    Assignee: The University of Massachusetts
    Inventors: Maria M. Santore, Jun Zhang, Vincent Rotello
  • Patent number: 8613895
    Abstract: A method and system remove contaminants from a vapor. In one embodiment, the system includes a contaminant removal system having a vacuum box. A contaminated vapor from process equipment is introduced to the vacuum box. The contaminated vapor includes steam and hydrocarbons. The vacuum box includes a water removal device. The water removal device removes water from the contaminated vapor to provide water and a reduced water vapor. The water and the reduced water vapor are removed from the vacuum box.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: December 24, 2013
    Assignee: Global Vapor Control, Inc.
    Inventors: Alan Finley, Doug Scott, Lisha Salathiel
  • Patent number: 8609063
    Abstract: Solvent extraction compositions having an orthohydroxyaryloxime extractant, an anti-degradation agent, and a water-immiscible organic solvent, processes for extracting a metal from an aqueous acidic solution using same, and methods of reducing degradation of such compositions are provided herein.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: December 17, 2013
    Assignee: Cytec Technology Corp.
    Inventors: John Campbell, Susan Owens, Matthew Soderstrom, Troy Bednarski, Gustavo Marin
  • Publication number: 20130325732
    Abstract: A heat transfer composition comprising trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)), difiuoromethane (R-32) and 1,1-difluoroethane (R-152a).
    Type: Application
    Filed: July 19, 2013
    Publication date: December 5, 2013
    Applicant: MEXICHEM AMANCO HOLDING S.A. DE C.V.
    Inventor: Robert E. Low
  • Patent number: 8557120
    Abstract: The invention relates to a process for collectively separating all the actinides (III), (IV), (V) and (VI) present in a strongly acidic aqueous phase, from the fission products, and in particular from the lanthanides, which are also present in this phase, using two extractants that operate in unconnected chemical fields. Applications: reprocessing of irradiated nuclear fuels, especially to recover plutonium, neptunium, americium, curium and, possibly, uranium present in trace amounts, in a grouped manner but selectively with respect to the lanthanides, from a solution for dissolution of an irradiated nuclear fuel, downstream of a uranium extraction cycle.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: October 15, 2013
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Xavier Heres, Manuel Miguirditchian, Pascal Baron, Laurence Chareyre
  • Patent number: 8491858
    Abstract: In some embodiments, the invention provides systems and methods for removing carbon dioxide and/or additional components of waste gas streams, comprising contacting the waste gas stream with an aqueous solution, removing carbon dioxide and/or additional components from the waste gas stream, and containing the carbon dioxide and/or additional components, in one form or another, in a composition. In some embodiments, the composition is a precipitation material comprising carbonates, bicarbonates, or carbonates and bicarbonates. In some embodiments, the composition further comprises carbonate and/or bicarbonate co-products resulting from co-processing SOx, NOx, particulate matter, and/or certain metals. Additional waste streams such as liquid, solid, or multiphasic waste streams may be processed as well.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: July 23, 2013
    Assignee: Calera Corporation
    Inventors: William Randall Seeker, Brent Constantz, Vinod Khosla
  • Patent number: 8470269
    Abstract: A highly efficient uranium leaching method using ultrasound is disclosed. The uranium leaching method includes preparing black slate powder containing uranium by pulverizing black slate containing uranium, placing the black slate powder and water in a reaction bath, and performing uranium leaching by adding and mixing sulfuric acid and an oxidant with the black slate powder and water to prepare a mixture in the reaction bath while applying ultrasound to the reaction bath. In this method, uranium leaching efficiency can be maximized by adding sulfuric acid to the uranium ore while applying ultrasound thereto.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: June 25, 2013
    Assignee: Korea Institute of Geoscience and Mineral Resources
    Inventors: Kyeong-Woo Chung, Chul-Joo Kim, Ho-Sung Yoon
  • Publication number: 20130121910
    Abstract: The present invention relates generally to a process for controlled leaching and sequential recovery of two or more metals from metal-bearing materials. In one exemplary embodiment, recovery of metals from a leached metal-bearing material is controlled and improved by providing a high grade pregnant leach solution (“HGPLS”) and a low grade pregnant leach solution (“LGPLS”) to a single solution extraction plant comprising at least two solution extractor units, at least two stripping units, and, optionally, at least one wash stage.
    Type: Application
    Filed: January 8, 2013
    Publication date: May 16, 2013
    Applicant: FREEPORT-MCMORAN CORPORATION
    Inventor: FREEPORT-MCMORAN CORPORATION
  • Patent number: 8420048
    Abstract: The present disclosure relates to a process and system for recovery of one or more metal values using solution extraction techniques and to a system for metal value recovery. In an exemplary embodiment, the solution extraction system comprises a first solution extraction circuit and a second solution extraction circuit. A first metal-bearing solution is provided to the first and second circuit, and a second metal-bearing solution is provided to the first circuit. The first circuit produces a first rich electrolyte solution, which can be forwarded to primary metal value recovery, and a low-grade raffinate, which is forwarded to secondary metal value recovery. The second circuit produces a second rich electrolyte solution, which is also forwarded to primary metal value recovery. The first and second solution extraction circuits have independent organic phases and each circuit can operate independently of the other circuit.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: April 16, 2013
    Assignee: Freeport-McMoran Corporation
    Inventors: Anand Raman, Jason M. Morgan, Barbara J Savage, David G Meadows, Wayne W Hazen
  • Patent number: 8382991
    Abstract: Discolored organic compounds (DOC) may be extracted from a medium using a sorbent composition derived by sulfidation of red mud, which contains hydrated ferric oxides derived from the Bayer processing of bauxitic ores. In some aspects, the sorbent composition is slurried with the medium. In other aspects, the sorbent composition is formed into pellets or the like, which are contacted with the medium. The red mud (along with adsorbed contaminants) is then separated from the water using any suitable technique, such as filtration, sedimentation, or centrifugation.
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: February 26, 2013
    Assignee: J. I. Enterprises, Inc.
    Inventor: Joseph Iannicelli
  • Patent number: 8382858
    Abstract: Textured heterogeneous surfaces and related articles as can be used in conjunction with methods for selective sensing and/or separation. When used for selective particle separation such a system can comprise a heterogeneous surface comprising a surface member and a plurality of components extending therefrom, such components spaced about and having a surface density, with heterogeneity comprising different interactions of the surface member and of the extended components with a particle exposed thereto. Various surface heterogeneities and different interactions can be utilized. However, in certain embodiments, competing electrostatic interactions, or a combination of electrostatic and non-electrostatic interactions, with a particle can be utilized. Such a system can utilize a surface member having a charge difference with respect to the components extending therefrom.
    Type: Grant
    Filed: June 25, 2009
    Date of Patent: February 26, 2013
    Assignee: University of Massachusetts
    Inventors: Maria M. Santore, Jung Zhang, Vincent Rotello
  • Patent number: 8361192
    Abstract: Various embodiments provide new methods of rhenium recovery. The methods can include subjecting a metal-bearing solution to an activated carbon bed, and adsorbing rhenium onto the activated carbon. The methods can also include heating a basic aqueous elution solution and eluting the rhenium from the activated carbon with the heated elution solution.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: January 29, 2013
    Assignee: Freeport-McMoran Corporation
    Inventors: Brett T. Waterman, Steve Nels Dixon, Theresa Linne Morelli, George Owusu, Stefka Todorova Ormsby
  • Patent number: 8343447
    Abstract: A hydrometallurgical process for a nickel oxide ore comprising obtaining an aqueous solution of crude nickel sulfate by high pressure acid leaching of a nickel oxide ore; obtaining a zinc free final solution by sulfurization of the solution; obtaining a waste solution; and scrubbing hydrogen sulfide gas from an exhaust gas. The process is characterized by at least one of the following operations: Adjusting the total volume (m3) of a sulfurization reactor to a ratio of 0.2-0.9 (m3/kg/h) relative to the input mass (kg/h) of the nickel to be introduced to the reactor; and/or subjecting the waste solution and the exhaust gas to countercurrent contact, then introducing the exhaust gas back to the scrubber and charging the waste solution from the scrubber into the sulfurization reactor.
    Type: Grant
    Filed: July 20, 2009
    Date of Patent: January 1, 2013
    Assignee: Sumitomo Metal Mining Co., Ltd.
    Inventors: Keisuke Shibayama, Yoshitomo Ozaki, Osamu Nakai
  • Patent number: 8328900
    Abstract: Provided herein are processes for recovering molybdenum and/or other value metals (e.g., uranium) present in aqueous solutions from a large range of concentrations: from ppm to grams per liter via a solvent extraction process by extracting the molybdenum and/or other value metal from the aqueous solution by contacting it with an organic phase solution containing a phosphinic acid, stripping the molybdenum and/or other value metal from the organic phase solution by contacting it with an aqueous phase strip solution containing an inorganic compound and having a ?1.0 M concentration of free ammonia, and recovering the molybdenum and/or other value metal by separating it from the aqueous phase strip solution. When the molybdenum and/or other value metal are present only in low concentration, the processes can include an organic phase recycle step and/or an aqueous phase strip recycle step in order to concentrate the metal prior to recover.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: December 11, 2012
    Assignee: Cytec Technology Corp.
    Inventors: Troy Allan Bednarski, Violina Antoneta Cocalia, Matthew Dean Soderstrom, Eduardo Alberto Kamenetzky, Andrew Michael Cameron, Douglas Harris
  • 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
  • Publication number: 20120301392
    Abstract: A method of leaching a metal value from a heap of a metal-containing ore and a heap leaching operation are disclosed. The method includes establishing a downward flow of a leach liquor through a section of the heap by supplying the leach liquor onto a top surface of the section and allowing the leach liquor (containing metal values in solution) to drain from a lower part of the section. The method is characterized by supplying the leach liquor onto the top surface of the section at a flow rate that is sufficient so that the downwardly flowing leach liquor saturates the section of the heap.
    Type: Application
    Filed: August 2, 2012
    Publication date: November 29, 2012
    Applicant: TECHNOLOGICAL RESOURCES PTY LTD
    Inventors: Robin John Batterham, Lucy Esdaile, Raymond Walter Shaw
  • Patent number: 8298510
    Abstract: The addition of a compatible metal salt crystal to the organic solution entering the mixer(s) in the solvent extraction stage(s) and/or the stripping stage(s), or to the emulsion mixture of the organic solution and the aqueous solution in the mixer(s), or to the mixture of the organic solution and the aqueous solution in a settler tank(s) following the mixer(s) in the solvent extraction and/or stripping stage(s) following the leaching of metal values from the ore containing that/those value(s) into an aqueous solution, and prior to the further refining of those values in processes, such as electrowinning, during mining operations for those metal values in order to improve the phase separation of the organic phase and the aqueous phase, and to promote the removal of contaminants from the organic phase.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: October 30, 2012
    Assignee: BASF Corporation
    Inventors: Eladio Rojas, Hans C. Hein
  • Patent number: 8273176
    Abstract: Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.
    Type: Grant
    Filed: June 13, 2011
    Date of Patent: September 25, 2012
    Assignee: Calisolar, Inc.
    Inventor: Scott Nichol
  • Patent number: 8268280
    Abstract: The present invention relates to a method for production of calcium compounds having very low content of phosphorus and boron from an impure calcium chloride, solution containing phosphorus and boron, which method comprises the following steps: a) addition of a FeCl3-solution to the calcium chloride solution, b) adjusting the pH of the solution by addition of a base to between 3 and 9.5 for precipitation of iron hydroxide, iron phosphate and boron compounds, c) removal of the solid precipitate from the solution in step b) obtaining a purified calcium chloride solution, d) precipitation of a calcium compound from the solution from step c), and e) separation of the calcium compound from the solution in step d).
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: September 18, 2012
    Assignee: Elkem Solar AS
    Inventors: Torfinn Buseth, Einar Andersen
  • Patent number: 8252086
    Abstract: Nickel entrained in the sulphide mineral pyrrhotite is engineered to dissolve in leaching acid in a two step procedure. First, a slurry of the mineral and the acid is activated by oxidation. This is done in a time T1 by electrolysis; or alternatively chemically, by adding e.g an oxidizing acid to the mineral. After activation, the slurry is then kept under anoxic conditions for a time T2. During T2, the sulphide starts to dissolve much more rapidly, and the rapid breakdown of the sulphide enables the nickel to dissolve and thus to be leached out of the mineral. The dissolved nickel is extracted from the leaching acid e.g by electro-winning.
    Type: Grant
    Filed: September 13, 2007
    Date of Patent: August 28, 2012
    Assignee: Enpar Technologies Inc.
    Inventors: Leonard Paul Seed, Gene Sidney Shelp
  • Patent number: 8206682
    Abstract: A method for recovering catalytic elements from a fuel cell membrane electrode assembly is provided. The method includes converting the membrane electrode assembly into a particulate material, wetting the particulate material, forming a slurry comprising the wetted particulate material and an acid leachate adapted to dissolve at least one of the catalytic elements into a soluble catalytic element salt, separating the slurry into a depleted particulate material and a supernatant containing the catalytic element salt, and washing the depleted particulate material to remove any catalytic element salt retained within pores in the depleted particulate material.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: June 26, 2012
    Inventors: Lawrence Shore, Ramail Matlin, Robert Heinz
  • Patent number: 8186607
    Abstract: An improved method and system is described for applying a leach solution to ore in the process of heap leaching. The Hybrid Irrigation System (HIS) relies on both surface solution delivery techniques as well as sub-surface solution application to improve the solution uniformity and metallurgical performance of a leaching process. The methods and systems allow for controlled application of leach solution with a hydraulic head applied that can be adjusted or varied depending on the conditions of the ore from negative, atmospheric or positive pressure, while distributing leaching solution in a uniform manner independent of surface variability with respect to elevation and infiltration capacity of the ore surface.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: May 29, 2012
    Assignee: G&S Partners
    Inventors: Amado Guzman, Randolph E. Scheffel
  • Patent number: 8163063
    Abstract: An object of the present invention is to provide a method of efficiently leaching copper from a copper sulfide ore containing chalcopyrite or enargite as a main constituent under versatile conditions for actual operation. A method of leaching copper from a copper sulfide ore, characterized by comprising using, as a leaching solution, a sulfuric acid solution containing iodide ions and ferric (III) ions in an excessive amount relative to the iodide ions and leaching copper from a copper sulfide ore; or a method of leaching copper from a copper sulfide ore, characterized by comprising leaching copper from a copper sulfide ore with the use of a leaching solution further containing water-soluble ligands such as chloride ions that can stabilize ferric (III) ions in addition to the above components, is provided.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: April 24, 2012
    Assignee: JX Nippon Mining & Metals Corporation
    Inventor: Manabu Manabe
  • Patent number: 8158102
    Abstract: A system, device, and method for mixing a substance with a liquid pumps the liquid into a container of the substance to produce a solution. The container may be part of a container assembly including a port assembly for coupling with the container to produce an inlet and/or and outlet port for the container. The container assembly may be received within a receiving chamber for causing the coupling. The solution may be permitted to flow out of the outlet port when the solution rises within the container to a level of the outlet port so that the substance is partially diluted before flowing out of the outlet port.
    Type: Grant
    Filed: October 30, 2003
    Date of Patent: April 17, 2012
    Assignee: DEKA Products Limited Partnership
    Inventors: Jason A. Demers, James D. Dale, Brian Tracey, David W. McGill, Larry B. Gray
  • Patent number: 8114371
    Abstract: Process for the production of precipitated silica from olivine including the following steps: providing olivine particles with a particle size preferably below 1 mm in diameter, preferably mixing olivine and water to form an olivine/water slurry, mixing the olivine/water slurry with hydrochloric acid (HCl), preferably at a Concentration at 18 wt % or above, and at a temperature preferably between 50 -130° C., and reacting for a period of time, preferably between 20-360 minutes, removal of coarse mineral impurities (sand product), separation of precipitated silica from mother solution, mechanical treatment of the separated precipitated silica and optionally some water to obtain a slurry, preparation of a low viscosity slurry by adding sodium aluminate or another suitable aluminate, preferably to 100-6000 p.p.m., and adjusting the pH, preferably to values between 4-9 ageing at a temperature between 50-150° C.
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: February 14, 2012
    Assignee: COD Technologies, a.s.
    Inventors: Gudmundur Gunnarsson, Oddmund Wallevik, Lars Øyvind Ekornrød, Birger Langseth, Per Bjøm Engseth
  • Patent number: 8029751
    Abstract: The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by a number of mechanisms, including control of the oxidation reaction conditions in the first autoclave compartment, hot curing of the autoclave discharge slurry, and/or contacting of the autoclave feed slurry with the hot cured discharge liquid.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: October 4, 2011
    Assignee: Placer Dome Technical Services Limited
    Inventors: James A. King, Jinxing Ji, Christopher Andrew Fleming, Cesare Giosue Ferron
  • Patent number: 8020710
    Abstract: The invention relates to a method for reversing the dispersion formed in the mixing section of liquid-liquid extraction and kept condensed in the separation section and the separated solutions form the rear end of the separation section to flow back towards the feed end of the separation section. The invention also refers to the extraction equipment for implementing the reversed flow.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: September 20, 2011
    Assignee: Outotec Oyj
    Inventors: Bror Nyman, Eero Ekman, Stig-Erik Hultholm, Pertti Pekkala, Juhani Lyyra, Launo Lilja, Raimo Kuusisto
  • Patent number: 7959730
    Abstract: Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: June 14, 2011
    Assignee: 6N Silicon Inc.
    Inventor: Scott Nichol