Flotation Patents (Class 423/26)
-
Patent number: 11332806Abstract: A method for desulfurization and dezincification of tailings includes the step of passing tap water into a high oxidation reduction electrocatalytic water equipment to reduce the pH value of tap water to 1-2, mixing a specific ratio of the pH value 1-2 acid electrocatalytic water with low-quality high-sulfur iron in the tailings, heating the mixture to let H+ in the acid electrocatalytic water be reacted with sulfur and zinc in the low-quality high-sulfur iron and to further cause generation of an ion state of hydrogen sulfide gas where the volatilization of water vapor effectively removes the sulfur and zinc elements in the low-quality high-sulfur iron and the hydrogen sulfide gas thus generated is collected.Type: GrantFiled: May 15, 2019Date of Patent: May 17, 2022Inventor: Kun-Liang Hong
-
Patent number: 10252276Abstract: An arrangement for recirculation of flotation gas in a mineral flotation process wherein the flotation gas volume fluctuations are handled by a closed pressure equalization loop including an apparatus for storing gas and adsorbing changes of gas pressure; a flushing line for connecting the pressure side of the primary gas recirculation loop to the apparatus for storing gas and adsorbing changes of gas pressure for allowing expulsion of a fraction of the flotation gas from the primary gas recirculation loop; and a suction line for connecting the suction side of the primary gas recirculation loop to the apparatus for storing gas and adsorbing changes of gas pressure, whereby the suction line comprises a pressure reducer for restricting flotation gas flow through the suction line.Type: GrantFiled: December 7, 2016Date of Patent: April 9, 2019Assignee: OUTOTEC (FINLAND) OYInventor: Jukka Lakanen
-
Patent number: 9839917Abstract: In a method for recovering a copper sulfide concentrate by froth flotation from an ore containing an iron sulfide, wet grinding of the ore with grinding media made of high chromium cast iron alloy having a chromium content of from 10 to 35% by weight is combined with an addition of hydrogen peroxide to the conditioned mineral pulp before or during flotation in order to improve concentrate grade and recovery of copper sulfides.Type: GrantFiled: July 11, 2014Date of Patent: December 12, 2017Assignees: Evonik Degussa GmbH, Magotteaux International S.A.Inventors: Christopher Greet, Gerhard Arnold, Ingo Hamann, Alan Hitchiner
-
Patent number: 8999034Abstract: 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: GrantFiled: April 18, 2013Date of Patent: April 7, 2015Assignee: Chemtreat, Inc.Inventors: John Richardson, Robert Bedinger, Kevin Gottschalk
-
Patent number: 8931642Abstract: A method of extracting targeted metallic minerals from ores that contain sulfide metallic minerals along with oxide minerals, carbonate minerals, silicate minerals, halide minerals or combinations thereof. In the method, an ore slurry containing the metallic mineral in oxide, carbonate, silicate or halide form is provided. The slurry is activated by adding sodium thiosulfate and sodium metabisulfite, whereby the targeted metallic mineral forms an intermediary metal complex with the sodium thiosulfate and sodium metabisulfite. One or more metal release components are introduced into the ore slurry; whereby the targeted metallic mineral is released from the intermediary metal complex to form a metal sponge. This metal sponge is then subjected to a flotation process, whereby the targeted metallic mineral is drawn out of the ore slurry and thereby extracted from the ore.Type: GrantFiled: January 13, 2014Date of Patent: January 13, 2015Inventor: William D. Simmons
-
Publication number: 20140369906Abstract: The present invention is directed to methods that can be used in the enrichment of metal sulfide ores in desired minerals in cases where the ores have sulfide-containing gangues. The method involves adding an oxidant to slurries prepared from the ores during, or immediately prior to froth flotation.Type: ApplicationFiled: January 25, 2013Publication date: December 18, 2014Applicant: Evonik Degussa GmbHInventors: Gerhard Arnold, Terry Brown, Ingo Hamann, Alan Hitchiner
-
Patent number: 8871162Abstract: The present invention relates to a process of gold and copper recovery from gold-containing copper ores obtained from mixed oxide-sulfide copper ore bodies by a series of flotation stages. More specifically, the present invention relates to a process of gold and copper recovery whereby gold-containing ores obtained from mixed oxide-sulfide copper ore bodies, and/or copper flotation by-products thereof, are subjected to at least one flotation step following a dewatering step. In particular, it recovers copper and gold from the oxidized zone of porphyry and other mixed ore deposits. Likewise, the present process allows recovery of copper and gold from the tailings and scavenger concentrates which, in conventional process are no longer viable for further treatment.Type: GrantFiled: June 8, 2011Date of Patent: October 28, 2014Inventor: Antonio M. Ostrea
-
Patent number: 8741238Abstract: In one aspect, the invention provides processes for producing an enriched copper concentrate from a copper-and-nickel-containing ore. Processes of the invention may include an initial step of comminuting the ore, to provide a ground ore comprising copper minerals and nickel minerals. The ground ore may be subjected to a floatation process, to separate the ground ore into distinct fractions, such as first and second concentrates. A first concentrate may for example be made up of copper-enriched-and-nickel-containing solids, while a second concentrate is made up of nickel-enriched-and-copper-containing solids. The floatation process may for example fractionate the ore so that the concentration of copper minerals is higher in the first concentrate than in the ore, and the concentration of the nickel minerals is higher in the second concentrate than the ore.Type: GrantFiled: August 13, 2013Date of Patent: June 3, 2014Assignee: Polymet Mining Corp.Inventor: David Bruce Dreisinger
-
Patent number: 8685350Abstract: Disclosed herein is a method for separating an arsenic mineral from a copper-bearing material, including the steps of grinding a copper-bearing material containing arsenic, adding water to the copper-bearing material to prepare a slurry, and adding a flotation agent including a depressant, a frother, and a collector to the slurry and blowing air into the slurry for performing flotation to obtain a copper concentrate, wherein the depressant is a chelator. As the chelator, a polyethyleneamine or the like is used. Particularly, when triethylenetetramine is used as the chelator, the amount of triethylenetetramine to be added is preferably 1 to 10 equivalents relative to the amount of soluble copper generated by oxidation of the copper-bearing material, and the pH of the slurry is more preferably adjusted to 7 or more but 8 or less before the slurry is subjected to the flotation.Type: GrantFiled: February 3, 2011Date of Patent: April 1, 2014Assignees: Sumitomo Metal Mining Co., Ltd., Kyushu University, National University CorporationInventors: Hideyuki Okamoto, Yoshiyuki Tanaka, Tsuyoshi Hirajima, Keiko Sasaki
-
Publication number: 20140044618Abstract: The present invention relates to a process of gold and copper recovery from gold-containing copper ores obtained from mixed oxide-sulfide copper ore bodies by a series of flotation stages. More specifically, the present invention relates to a process of gold and copper recovery whereby gold-containing ores obtained from mixed oxide-sulfide copper ore bodies, and/or copper flotation by-products thereof, are subjected to at least one flotation step following a dewatering step. In particular, it recovers copper and gold from the oxidized zone of porphyry and other mixed ore deposits. Likewise, the present process allows recovery of copper and gold from the tailings and scavenger concentrates which, in conventional process are no longer viable for further treatment.Type: ApplicationFiled: June 8, 2011Publication date: February 13, 2014Inventor: Antonio M. Ostrea
-
Publication number: 20140044617Abstract: In one aspect, the invention provides processes for producing an enriched copper concentrate from a copper-and-nickel-containing ore. Processes of the invention may include an initial step of comminuting the ore, to provide a ground ore comprising copper minerals and nickel minerals. The ground ore may be subjected to a floatation process, to separate the ground ore into distinct fractions, such as first and second concentrates. A first concentrate may for example be made up of copper-enriched-and-nickel-containing solids, while a second concentrate is made up of nickel-enriched-and-copper-containing solids. The floatation process may for example fractionate the ore so that the concentration of copper minerals is higher in the first concentrate than in the ore, and the concentration of the nickel minerals is higher in the second concentrate than the ore.Type: ApplicationFiled: August 13, 2013Publication date: February 13, 2014Applicant: Polymet Mining Corp.Inventor: David Bruce Dreisinger
-
Patent number: 8383070Abstract: A method of recovering rhenium (Re) and other metals from Re-bearing materials in the form of ammonium perrhenate having at least the step of adding Re-bearing materials into a leaching slurry. Additionally, the method has the step of adjusting the pH of the slurry to obtain Re in soluble form in a metal salt solution and insoluble residues; filtering the metal salt solution to remove the insoluble residues; selectively precipitating Re from the metal salt solution; filtering the Re precipitate from the metal salt solution to obtain a Re filtercake; and formulating and drying the Re filtercake to obtain a Re sulfide product. The method further has the step of combining the Re sulfide product with a Molybdenum (Mo) concentrate containing Re to obtain a Mo/Re concentrate; roasting the Mo/Re concentrate to obtain Mo oxide product and a flue gas containing Re; and treating the flue gas containing Re to obtain ammonium perrhenate.Type: GrantFiled: March 8, 2011Date of Patent: February 26, 2013Assignees: World Resources Company, WRC World Resources Company GmbHInventors: Eberhard Luederitz, Ulrich R. Schlegel, Peter T. Halpin, Dale L. Schneck
-
Publication number: 20130004389Abstract: Disclosed herein is a method for separating an arsenic mineral from a copper-bearing material, including the steps of grinding a copper-bearing material containing arsenic, adding water to the copper-bearing material to prepare a slurry, and adding a flotation agent including a depressant, a frother, and a collector to the slurry and blowing air into the slurry for performing flotation to obtain a copper concentrate, wherein the depressant is a chelator. As the chelator, a polyethyleneamine or the like is used. Particularly, when triethylenetetramine is used as the chelator, the amount of triethylenetetramine to be added is preferably 1 to 10 equivalents relative to the amount of soluble copper generated by oxidation of the copper-bearing material, and the pH of the slurry is more preferably adjusted to 7 or more but 8 or less before the slurry is subjected to the flotation.Type: ApplicationFiled: February 3, 2011Publication date: January 3, 2013Applicants: KYUSHU UNIVERSITY NATIONAL UNIVERSITY CORPORATION, SUMITOMO METAL MINING CO LTDInventors: Hideyuki Okamoto, Yoshiyuki Tanaka, Tsuyoshi Hirajima, Keiko Sasaki
-
Patent number: 8257671Abstract: A method of leaching copper sulfide ore includes leaching copper from copper sulfide ore using a sulfuric acid solution comprising iodide ion and iron (III) ion surplus to the iodide ion as a leaching solution; reducing iodine in a solution obtained after the leaching step to less than 1 mg/L by an activated carbon treatment; and oxidizing iron (II) ion or newly added iron (II) ion in a solution obtained after the iodine reduction step by using iron oxidizing microbes to recover iron (III) ion.Type: GrantFiled: March 15, 2011Date of Patent: September 4, 2012Assignee: JX Nippon Mining & Metals CorporationInventors: Kenichi Kuwano, Atsuko Abe, Manabu Manabe, Akira Miura
-
Patent number: 8221709Abstract: Disclosed are compositions and methods for separating gangue material from metallic sulfide ores. The compositions typically include a lignosolfonate and do not include a cyanide salt. Suitable lignosulfonates may include lignosulfonates, for example hardwood lignosulfonate having a weight average molecular weight of about 3 kDa to about 12 kDa and having a relatively low sulfur content and a relatively low sulfonate content.Type: GrantFiled: August 29, 2008Date of Patent: July 17, 2012Assignee: LignoTech USA, Inc.Inventors: Jerry D. Gargulak, Lori L. Bushar
-
Publication number: 20120027652Abstract: In one aspect, the invention provides processes for producing an enriched copper concentrate from a copper-and-nickel-containing ore. Processes of the invention may include an initial step of comminuting the ore, to provide a ground ore comprising copper minerals and nickel minerals. The ground ore may be subjected to a floatation process, to separate the ground ore into distinct fractions, such as first and second concentrates. A first concentrate may for example be made up of copper-enriched-and-nickel-containing solids, while a second concentrate is made up of nickel-enriched-and-copper-containing solids. The floatation process may for example fractionate the ore so that the concentration of copper minerals is higher in the first concentrate than in the ore, and the concentration of the nickel minerals is higher in the second concentrate than the ore.Type: ApplicationFiled: January 25, 2011Publication date: February 2, 2012Applicant: Polymet Mining Corp.Inventor: David Bruce Dreisinger
-
Patent number: 8088347Abstract: Process for recovering copper sulphide and optionally molybdenum sulphide from a copper bearing ore by froth flotation includes crushing said ore, mixing the obtained ground powder with at least a collector and water, aerating the slurry, and removing and concentrating the mineral froth formed at the surface of the bath, wherein the collector comprises a thioglycolic acid derivate having the following formula: wherein R1 is N or O, and R2 is an alkyl group having 2 to 12 carbon atoms.Type: GrantFiled: March 7, 2008Date of Patent: January 3, 2012Assignee: S.P.C.M. SAInventors: Daniel Canady, Mark Dewald
-
Patent number: 8025859Abstract: A process for the extraction of a precious metal, such as gold or silver, from a sulphide ore or concentrate or other source material comprises subjecting the source material to pressure oxidation to produce a pressure oxidation slurry. The pressure oxidation slurry is flashed down to a lower temperature and pressure and is then subjected to a liquid/solid separation to obtain a pressure oxidation solution and a solid residue containing the precious metal. The solid residue is then subjected to cyanidation to extract the precious metal. The formation of thiocyanide during cyanidation is minimized or counteracted by effecting the cyanidation at an elevated oxygen pressure and a reduced retention time, such as 30 to 90 minutes. A method for the reduction of copper cyanide formation during cyanidation leaching is also provided.Type: GrantFiled: May 18, 2007Date of Patent: September 27, 2011Assignee: CESL LimitedInventor: David L. Jones
-
Patent number: 7922788Abstract: The present invention is directed to flotation of refractory gold sulfide ores in which the ore is ground, floated, the tailings reground, and refloated to produce gold-bearing concentrates.Type: GrantFiled: September 11, 2008Date of Patent: April 12, 2011Assignee: Barrick Gold CorporationInventors: Daniel Hillier, Barun Gorain, Jacques McMullen
-
Publication number: 20110020198Abstract: Process for recovering copper sulphide and optionally molybdenum sulphide from a copper bearing ore by froth flotation includes crushing said ore, mixing the obtained ground powder with at least a collector and water, aerating the slurry, and removing and concentrating the mineral froth formed at the surface of the bath, wherein the collector comprises a thioglycolic acid derivate having the following formula: wherein R1 is N or O, and R2 is an alkyl group having 2 to 12 carbon atoms.Type: ApplicationFiled: March 7, 2008Publication date: January 27, 2011Applicant: SNF FLOMIN INC.Inventors: Daniel Canady, Mark Dewald
-
Patent number: 7811534Abstract: The present invention relates to a method for the treatment of copper-bearing materials, such as copper concentrates, so that the impurities and gangue minerals in the materials, such as silicates, are in effect removed completely.Type: GrantFiled: February 13, 2006Date of Patent: October 12, 2010Assignee: Outotec OyjInventors: Stig-Erik Hultholm, Seppo Heimala, Teemu Ritasalo, Mikko Ruonala
-
Publication number: 20100233050Abstract: Disclosed are compositions and methods for separating gangue material from metallic sulfide ores. The compositions typically include a lignosulfonate and do not include a cyanide salt. Suitable lignosulfonates may include lignosulfonates, for example hardwood lignosulfonate having a weight average molecular weight of about 3 kDa to about 12 kDa and having a relatively low sulfur content and a relatively low sulfonate content.Type: ApplicationFiled: August 29, 2008Publication date: September 16, 2010Applicant: LIGNOTECH USA, INC.Inventors: Jerry D. Gargulak, Lori L. Bushar
-
Patent number: 7666371Abstract: The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials through pressure leaching operations. In accordance with the various aspects of the present invention, metal-containing pregnant leach solutions from pressure leaching operations need not be significantly diluted to facilitate effective metal recovery using solvent extraction and electrowinning.Type: GrantFiled: December 7, 2007Date of Patent: February 23, 2010Assignee: Freeport-McMoran CorporationInventors: John O Marsden, Robert E Brewer, Joanna M Robertson, Wayne W Hazen, Philip Thompson, David R Baughman
-
Patent number: 7576244Abstract: Compounds of formula (I) wherein R1 and R2 are each independently C1-C2 alkyl, and m is 1, 2, 3, 4, or 5 and compositions of formula (II) wherein R1 and R2 are each independently C1-C4 alkyl, and n is an integer >_0 and wherein the average molar value of n for the total of the compounds of formula (II) in said composition is in the range of (1) to (3) and methods for production thereof.Type: GrantFiled: December 9, 2003Date of Patent: August 18, 2009Assignee: Huntsman Corporation Australia Pty. LimitedInventors: Philip Joseph Leeming, Stewart John Knight, Salvatore Lazzaro, Jeffrey Roy Aston, David Hayshiv Parris
-
Patent number: 7491372Abstract: A chemical process to leach copper concentrates in the presence of a concentrated solution of sulfates and chlorides. The process includes forming a high reactivity chemical paste containing a high concentration of ions in the liquid phase of the paste which react with copper ores and forms a series of soluble salts. The salts are extracted by a simple wash. Mixing equipment for handling high viscosity liquids is used. The total mixing time is about 5 minutes, after which the paste is poured into a rectangular mold, of several hundred meters per side, and is left to settle and breathe. During settling, water and sulfuric acid are added at intervals to replace that consumed by the reactions taking place during the aeration, until the reactions have virtually end. This treatment results in a dry, very resistant mass, containing the copper extracted in form of chlorine salts, and sulfate.Type: GrantFiled: December 21, 2004Date of Patent: February 17, 2009Assignee: Minera Michilla S.A.Inventors: Jamie Rauld Faine, Freddy Aroca Alfaro, Raúl Montealegre Jullian, Abraham Backit Gutierrez
-
Patent number: 7482495Abstract: A process for making an alkylene glycol ether composition is disclosed. In one aspect, the process comprises reacting propylene glycol methyl ether (PM) with from 1.5 to 3 equivalents of propylene oxide (PO). The resulting alkoxylation mixture is distilled to provide a composition comprising at least 30 wt. % of TPM and less than 20 wt. % of DPM. In another process of the invention, DPM reacts with from 0.5 to 1.5 equivalents of PO in similar fashion to make an analogous product. Also disclosed are alkylene glycol ether compositions made by the process of the invention and use of the compositions in a method for recovering metals from metallic ores by froth flotation.Type: GrantFiled: December 22, 2005Date of Patent: January 27, 2009Assignee: Lyondell Chemical Technology, L.P.Inventor: Farhad Fadakar
-
Patent number: 7435405Abstract: By suppressing oxidation of sulfide minerals in sulfide ore due to bacteria or the like, this invention prevents the elution of heavy metals from the sulfide ore, and reduces the decrease in flotation performance when processing sulfide ore that is stored in a stockpile. Also, the invention makes it easier to process acidic wastewater from a stockpile or tailings dumpsite. In order to accomplish this, oxidation of sulfide minerals in sulfide ore is suppressed by adding an antioxidant, which contains plant polyphenol and whose main component is an organic acid that contains a carboxyl group, to the sulfide ore stored in a stockpile or tailings dumpsite.Type: GrantFiled: April 14, 2005Date of Patent: October 14, 2008Assignee: Sumitomo Metal Mining Co., Ltd.Inventors: Yoshiyuki Tanaka, Ryoichi Nakayama, Hideyuki Okamoto, Masaki Imamura
-
Publication number: 20080152558Abstract: The present invention relates to a method for the treatment of copper-bearing materials, such as copper concentrates, so that the impurities and gangue minerals in the materials, such as silicates, are in effect removed completely.Type: ApplicationFiled: February 13, 2006Publication date: June 26, 2008Applicant: OUTOTEC OYJInventors: Stig-Erik Hultholm, Seppo Heimala, Teemu Ritasalo, Mikko Ruonala
-
Patent number: 7387767Abstract: A process for recovering nickel and cobalt values from nickel- and cobalt-containing laterite ores as an enriched mixed nickel and cobalt sulphide intermediate and for producing nickel and cobalt metal from the nickel and cobalt sulphide intermediate. The laterite ore is leached as a slurry in a pressure acid leach containing an excess of aqueous sulphuric acid at high pressure and temperature, excess free acid in the leach slurry is partially neutralized to a range of 5 to 10 g/L residual free H2SO4 and washed to yield a nickel- and cobalt-containing product liquor, the product liquor is subjected to a reductant to reduce any Cr(VI) in solution to Cr(III), the reduced product liquor is neutralized to precipitate ferric iron and silicon at a pH of about 3.5 to 4.0, and the neutralized and reduced product liquor is contacted with hydrogen sulphide gas to precipitate nickel and cobalt sulphides.Type: GrantFiled: April 7, 2005Date of Patent: June 17, 2008Assignee: Dynatec CorporationInventors: Finlay Campbell, Michael Collins, Ian Masters, Lyle Trytten
-
Patent number: 7219804Abstract: A method of flotation processing ores and other mineral materials containing soluble nonferrous base metal and sulfide minerals involves dissolving the soluble nonferrous base metal and precipitating the soluble nonferrous base metal in the form of a floatable precipitate that is collected as part of a sulfide concentrate. The use of an oxygen-deficient flotation gas, such as nitrogen gas, promotes the precipitation of the floatable precipitate. A method for removing dissolved nonferrous base metal from solution involves contacting the solution with a particulate containing sulfide minerals under conditions promoting precipitation of the nonferrous base metal onto the sulfide mineral.Type: GrantFiled: April 1, 2004Date of Patent: May 22, 2007Assignee: Newmont USA LimitedInventors: Gary L. Simmons, John C. Gathje
-
Patent number: 7018593Abstract: A method of recovering base metal from a tailings dump which includes the steps of: aerating a surface layer of the dump; adjusting the pH and the moisture content of the surface layer to provide conditions favourable for bacterial oxidation of sulphide minerals; allowing bacterial oxidation to take place for a controlled period, after the controlled period removing the oxidized surface layer and adding water thereto for form a slurry; separating the slurry into solids and a solution; and recovering base metal from the solution.Type: GrantFiled: August 31, 2000Date of Patent: March 28, 2006Assignee: Billiton SA LimitedInventors: Peter Michael Craven, Trevor Hugh Tunley
-
Patent number: 6965629Abstract: A nanopowder synthesis system having an autofuser device which obviates the need for external power switches, and which accommodates repeated discharges (of the order of 107) between ablating electrodes of precursor material at a high repetition rate (?1 Hz).Type: GrantFiled: June 7, 2004Date of Patent: November 15, 2005Assignee: Nanotechnologies, Inc.Inventors: Kurt A. Schroder, Douglas Keith Jackson, Stephen James Schmidt
-
Patent number: 6953120Abstract: A method of recovering metal and/or oxide thereof from a slurry is described. The method involves magnetically separating at least a portion of any magnetic impurities from the slurry and then leaching or dissolving at least a portion of any remaining magnetic impurities in a slurry. At least one chelating agent can then be added to the slurry and the solids can be recovered from the slurry by various separation techniques. The methods of the present invention are particularly useful in the recovery of tantalum and/or oxide thereof especially tantalum and/or oxide thereof having a very fine size.Type: GrantFiled: February 8, 2002Date of Patent: October 11, 2005Assignee: Cabot CorporationInventors: Claude Deveau, Stephen R. Young
-
Patent number: 6875254Abstract: Methods for detecting gold and quantitating gold in ore samples utilizing a gold-specific protein are provided, including methods for multiple sample handling. Also provided are methods for extracting gold from mineral suspensions utilizing a magnetic mineral binding reagent and gold-specific protein, or hydrophobic reagent and gold-specific protein in conjunction with a flotation reagent.Type: GrantFiled: February 3, 2004Date of Patent: April 5, 2005Assignees: University of Washington, Placer Dome, Inc.Inventors: Clement E. Furlong, Scott Jorgenson-Soelberg, James B. Clendenning, Noel W. Kirshenbaum, Victor Chevillon, Peter Leon Kowalczyk
-
Patent number: 6680034Abstract: The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials through pressure leaching operations. In accordance with the various aspects of the present invention, metal-containing pregnant leach solutions from pressure leaching operations need not be significantly diluted to facilitate effective metal recovery using solvent extraction and electrowinning.Type: GrantFiled: July 25, 2001Date of Patent: January 20, 2004Assignee: Phelps Dodge CorporationInventors: John O. Marsden, Robert E. Brewer, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman
-
Publication number: 20020039974Abstract: A flotation agent including an oxidized paraffinic product which may be a Fischer-Tropach reaction product obtained by way of the Fischer-Tropsch reaction from carbon monoxide and hydrogen feed. A process for the production of a synthetic fatty acid suitable as a substitute for naturally derived fatty acid in various applications is also disclosed.Type: ApplicationFiled: January 29, 2001Publication date: April 4, 2002Inventors: Derick Raymond Johannes, Johannes Jurie Human
-
Patent number: 6251163Abstract: The process of the present invention recovers precious metals from refractory carbonaceous precious metal ores by floating a portion of the ground ore, blending the concentrate with an unfloated portion of the ore, autogenously autoclaving the blended material, cooling the oxidized slurry by dilution, leaching the oxidized slurry after dilution in the presence of a thiosulfate lixiviant, and recovering the precious metal by suitable techniques.Type: GrantFiled: March 4, 1998Date of Patent: June 26, 2001Assignee: Placer Dome, Inc.Inventor: James A. King
-
Patent number: 6210648Abstract: A method is provided for flotation of refractory auriferous sulfide using an oxygen-deficient flotation gas. The method is particularly suited for non-selective flotation of different iron-containing sulfide mineral species. Comminution prior to flotation may be performed in an oxygen-deficient environment.Type: GrantFiled: April 8, 1999Date of Patent: April 3, 2001Assignee: Newmont Mining CorporationInventors: John C. Gathje, Gary L. Simmons
-
Patent number: 6200377Abstract: An improved process for the beneficiation of mixtures of mineral particles (such as kaolin clays) containing minerals which chelate with hydroxamates. The use of a silicon-containing compound in combination with a hydroxamate results in a more effective separation of minerals which chelate with the hydroxamate.Type: GrantFiled: April 16, 1999Date of Patent: March 13, 2001Assignee: Thiele Kaolin CompanyInventors: Cesar I. Basilio, J. Michael Randolph
-
Patent number: 5902977Abstract: The present invention provides a process that employs both non-selective flotation and oxidative leaching of the resulting concentrates to recover an increased amount of copper from porphyry copper ores. The non-selective flotation step uses collectors and conditions, such as pH, that are conducive to the strong flotation of sulfide minerals generally. In the oxidative leach, the copper sulfide minerals in the concentrate fraction are oxidized to copper compounds, which are soluble in the leach solution. The oxidative leach includes the use of ammonia and sulfite under agitation leaching conditions to convert the copper sulfide minerals into ammonia soluble forms.Type: GrantFiled: July 14, 1997Date of Patent: May 11, 1999Assignee: COPROCO Development CorporationInventor: Nathaniel Arbiter
-
Patent number: 5837210Abstract: Provided is a method for processing a gold-bearing sulfide ore which involves maintaining the ore in a substantially oxygen free environment, preferably beginning with comminution of the ore and ending when a desired final concentrate, enriched in sulfide minerals, is obtained by flotation. In one embodiment, nitrogen gas is used to substantially prevent contact between the ore and air during comminution of the ore and during flotation operations. It is believed that oxygen gas present in air detrimentally affects the recovery of sulfide minerals in a flotation concentrate through surface oxidation of sulfide mineral particles. The use of a gas such as nitrogen can significantly reduce the potential for such surface oxidation.Type: GrantFiled: October 23, 1996Date of Patent: November 17, 1998Assignee: Newmont Gold CompanyInventors: Gary L. Simmons, John C. Gathje
-
Patent number: 5807479Abstract: The present invention provides a process that employs both non-selective flotation and oxidative leaching of the resulting concentrates to recover an increased amount of copper from porphyry copper ores. The non-selective flotation step uses collectors and conditions, such as pH, that are conducive to the strong flotation of sulfide minerals generally. In the oxidative leach, the copper sulfide minerals in the concentrate fraction are oxidized to copper compounds, which are soluble in the leach solution. The oxidative leach includes the use of ammonia and sulfite under agitation leaching conditions to convert the copper sulfide minerals into ammonia soluble forms.Type: GrantFiled: July 14, 1995Date of Patent: September 15, 1998Assignee: COPROCO Development CorporationInventor: Nathaniel Arbiter
-
Patent number: 5795465Abstract: The present invention provides a process that employs both non-selective flotation and oxidative leaching of the resulting concentrates to recover an increased amount of copper from porphyry copper ores. The non-selective flotation step uses collectors and conditions, such as pH, that are conducive to the strong flotation of sulfide minerals generally. In the oxidative leach, the copper sulfide minerals in the concentrate fraction are oxidized to copper compounds, which are soluble in the leach solution. The oxidative leach includes the use of ammonia and sulfite under agitation leaching conditions to convert the copper sulfide minerals into ammonia soluble forms.Type: GrantFiled: July 15, 1994Date of Patent: August 18, 1998Assignee: Coproco Development CorporationInventor: Nathaniel Arbiter
-
Patent number: 5792235Abstract: A method for recovering precious metals from carbonaceous ore comprising leaching the ore with a lixiviant solution and then preg-robbingly concentrating the precious metal-lixiviant complexes in solution on to the native carbonaceous component of the ore for subsequent recovery. The preg-robbing capacity of the native carbonaceous component of the ore can be augmented by adding recycled carbonaceous matter or finely ground carbon to the ore-lixiviant mixture.Type: GrantFiled: April 3, 1995Date of Patent: August 11, 1998Assignee: Geobiotics, Inc.Inventor: William J. Kohr
-
Patent number: 5770170Abstract: There is provided a novel class of additives, specifically coals, which are useful in zinc extraction processes involving one or more pressure leach stages carried out at temperatures above the melting point of sulphur. Such processes may include those incorporating a single stage pressure leach, a process involving two stage countercurrent or cocurrent pressure leaches or a multistage leach process for recovering zinc, lead and silver from zinc bearing sulphidic materials which also contain lead and silver.Type: GrantFiled: August 20, 1996Date of Patent: June 23, 1998Assignee: 698638 Alberta Ltd.Inventors: Michael J. Collins, Donald K. Kofluk
-
Patent number: 5653945Abstract: Provided is a method for processing a gold-bearing sulfide ore which involves maintaining the ore in a substantially oxygen free environment, preferably beginning with comminution of the ore and ending when a desired final concentrate, enriched in sulfide minerals, is obtained by flotation. In one embodiment, nitrogen gas is used to substantially prevent contact between the ore and air during comminution of the ore and during flotation operations. It is believed that oxygen gas present in air detrimentally affects the recovery of sulfide minerals in a flotation concentrate through surface oxidation of sulfide mineral particles. The use of a gas such as nitrogen can significantly reduce the potential for such surface oxidation.Type: GrantFiled: April 18, 1995Date of Patent: August 5, 1997Assignee: Santa Fe Pacific Gold CorporationInventors: John C. Gathje, Gary L. Simmons
-
Patent number: 5443621Abstract: A method for recovering precious metals from carbonaceous ore comprising leaching the ore with a lixiviant solution and then preg-robbingly concentrating the precious metal-lixiviant complexes in solution on to the native carbonaceous component of the ore for subsequent recovery. The preg-robbing capacity of the native carbonaceous component of the ore can be augmented by adding recycled carbonaceous matter or finely ground carbon to the ore-lixiviant mixture. Furthermore, after the carbonaceous component of the ore is separated from the gangue, the gangue material can be treated in a hot CIL process to further increase the recovery of the precious metal.Type: GrantFiled: October 14, 1994Date of Patent: August 22, 1995Assignee: Giobiotics, Inc.Inventor: William J. Kohr
-
Patent number: 5348713Abstract: A process is disclosed for recovering zinc, lead, copper and precious metals from zinc plant residue, said process comprising leaching the residue with return zinc spent electrolyte, neutralizing residual acid and reducing ferric iron in the solution by addition of zinc sulphide concentrate in the presence of a limited quantity of oxygen, flotation of the resulting slurry to separate unreacted zinc sulphide, treatment of flotation tailings with sulphur dioxide and elemental sulphur to further leach iron, zinc and impurity elements and precipitate copper, flotation of the resulting slurry to separate a copper sulphide concentrate, thickening, filtering and washing of the flotation tailings followed by addition of lime and sodium sulphide to activate lead sulphate and flotation of a lead concentrate from the residue.Type: GrantFiled: August 14, 1992Date of Patent: September 20, 1994Assignee: Sherritt Gordon LimitedInventors: Derek E. Kerfoot, Michael J. Collins, Michael E. Chalkley
-
Patent number: 5320759Abstract: A process for selectively recovering dissolved heavy metals from a solution is disclosed that involves selectively reacting a xanthate with such dissolved heavy metals. Selective reaction of a xanthate with selected dissolved heavy metals is accomplished by conducting the reaction under conditions such that only some of the heavy metals react with the xanthate, to the exclusion of reaction with other dissolved heavy metals. Selectivity of the reaction is particularly influenced by the pH at which the reaction occurs. Typically, the reaction should occur at a pH below about 4.0. Xanthates, once reacted, can be separated from the heavy metal xanthate reaction product and recycled for use within the process. Purified heavy metal product can be produced if desired.Type: GrantFiled: June 11, 1992Date of Patent: June 14, 1994Assignee: Hazen Research, Inc.Inventor: Enzo Coltrinari
-
Patent number: H2082Abstract: A flotation agent including an oxidized paraffinic product which may be a Fischer-Tropach reaction product obtained by way of the Fischer-Tropsch reaction from carbon monoxide and hydrogen feed. A process for the production of a synthetic fatty acid suitable as a substitute for naturally derived fatty acid in various applications is also disclosed.Type: GrantFiled: January 29, 2001Date of Patent: September 2, 2003Assignee: Schumann Sasol (SA)Inventors: Derick Raymond Johannes, Johannes Jurie Human