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| Number | Title | Issue Date |
| 7491372 | Procedure to leach copper concentrates, under pressure and at ambient temperature, by forming a reactive gel in a sulfate-chloride medium 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 w... | 02/17/2009 |
| 7435405 | Anti-oxidation method for sulfide minerals in sulfide ore 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 stock... | 10/14/2008 |
| 7387767 | Recovery of nickel, cobalt, iron, silica, zinc and copper from laterite ore by sulfuric acid leaching 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 o... | 06/17/2008 |
| 7219804 | Flotation processing including recovery of soluble nonferrous base metal values 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 preci... | 05/22/2007 |
| 7018593 | Base metal recovery from a tailings dump by bacterial oxidation 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; al... | 03/28/2006 |
| 7004326 | Arsenide depression in flotation of multi-sulfide minerals A mineral separation process includes wet-grinding the ore to liberation of minerals, oxidizing the slurry using air, hydrogen peroxide or other oxidants and floating the valuable minerals at a pH between about 9.0 and 10.0 with a xanthate as collector, and a combin... | 02/28/2006 |
| 6965629 | Method and apparatus for initiating a pulsed arc discharge for nanopowder synthesis 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 (≧... | 11/15/2005 |
| 6953120 | Method of recovering metal and/or oxide thereof in a slurry and tailings obtained from said method 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 impur... | 10/11/2005 |
| 6875254 | Methods for detecting and extracting gold 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 bindin... | 04/05/2005 |
| 6680034 | Method for recovering metal values from metal-containing materials using high temperature pressure leaching 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 pregn... | 01/20/2004 |
| 6251163 | Method for recovering gold from refractory carbonaceous ores 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 mat... | 06/26/2001 |
| 6210648 | Method for processing refractory auriferous sulfide ores involving preparation of a sulfide concentrate 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... | 04/03/2001 |
| 6200377 | Process for beneficiation of mixtures of mineral particles 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 s... | 03/13/2001 |
| 5902977 | Flotation cell and method 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 an... | 05/11/1999 |
| 5837210 | Method for processing gold-bearing sulfide ores involving preparation of a sulfide concentrate 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... | 11/17/1998 |
| 5807479 | Process for recovering copper from copper-containing material 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 an... | 09/15/1998 |
| 5795465 | Process for recovering copper from copper-containing material 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 an... | 08/18/1998 |
| 5792235 | Method for recovering gold and other precious metals from carbonaceous ores 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... | 08/11/1998 |
| 5770170 | Recovery of zinc from sulphidic concentrates 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 in... | 06/23/1998 |
| 5653945 | Method for processing gold-bearing sulfide ores involving preparation of a sulfide concentrate 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... | 08/05/1997 |
| 5443621 | Method for recovering gold and other precious metals from carbonaceous ores 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... | 08/22/1995 |
| 5348713 | Recovery of metal values from zinc plant residues 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 a... | 09/20/1994 |
| 5320759 | Selective recovery of heavy metals using xanthates 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 ... | 06/14/1994 |
| 5108495 | Method controlling a process by impedance analysis The invention relates to a method for controlling a process operating by means of the electrochemical potential, in which process complex ores and/or concentrates are treated in order to arrange the valuable components in the materials in a form appropria... | 04/28/1992 |
| 5074993 | Flotation process A method of flotation of sulfides wherein pyrrhotite is depressed by use of a water-soluble polyamine while non-ferrous metal-containing sulfide or sulfidized minerals are floated selectively.... | 12/24/1991 |
| 5013359 | Process for recovering gold from refractory sulfidic ores A process for recovering gold from a refractory sulfidic ore which has been suspended in an aqueous slurry and oxidized using nitric acid so that substantially all of the gold in the ore is made available for recovery and at least a portion of the sulfidi... | 05/07/1991 |
| 4895597 | Recovery of precious metals Recovery of precious metals such as gold and silver from aqueous cyanide solutions thereof, by contact with a reagent containing a guanidine functionality. The guanidine reagent extracts the precious metal from the aqueous solution which is subsequently s... | 01/23/1990 |
| 4879022 | Ore flotation process and use of mixed hydrocarbyl dithiophosphoric acids and salts thereof The present invention relates to an improved process for beneficiating an ore containing sulfide materials with selective rejection of pyrite, pyrrhotite and other metals and gangue. In particular, the process is useful for beneficiating ores and recoveri... | 11/07/1989 |
| 4853114 | Method for the depressing of hydrous, layered silicates A process for the recovery of mineral values from base metal ores is disclosed. Specifically, a froth flotation process is disclosed which comprises contacting an aqueous ore slurry with an effective amount of hemicellulose, a mineral collector and a frot... | 08/01/1989 |
| 4851036 | Mineral ore flotation process and apparatus There is disclosed a process and an apparatus for beneficiating a mineral ore, such as phosphate-containing ore, in a substantially vertical column. The feed subjected to the benefication preferably has a particle size of less than 20 mesh. The feed is in... | 07/25/1989 |
| 4797202 | Froth flotation method Minerals are recovered from ore by subjecting the ore, in the form of an aqueous pulp, to a froth flotation process in the presence of a collector of the formula: or wherein --(R)n -- is ##STR1## each R' is independently hydrogen, methyl o... | 01/10/1989 |
| 4793852 | Process for the recovery of non-ferrous metal sulfides This invention relates to a method of recovering non-ferrous metal sulfides from a metal ore which comprises subjecting the metal ore, in the form of an aqueous pulp, to a froth flotation process in the presence of a flotating amount of a flotation collec... | 12/27/1988 |
| 4786318 | Thickening of gold process slurries A process for thickening gold ore slurries or slimes for gold purification which comprises adding to such gold ore slimes an effective amount of flocculant comprising a terpolymer containing 5-35 mole % 2-AMPS, 5-45 mole % sodium acrylate and 50-90 mole %... | 11/22/1988 |
| 4747940 | Ore flotation and tri-alkali metal-di(carboxyalkyl) dithiocarbamate and triammonium-di(carboxyalkyl) dithiocarbamate flotation agents for use therein Tri-alkali metal di(carboxyalkyl) dithiocarbamates and triammonium-di(carboxyalkyl) dithiocarbamates which can be characterized by the formula ##STR1## wherein R and R' can be the same or different and are selected from the group consisting of a... | 05/31/1988 |
| 4744893 | Polymeric sulfide mineral depressants A process for the froth flotation separation of value sulfide minerals from gangue iron sulfide minerals in which a novel terpolymer of copolymer of acylamide, acrylic acid and/or derivatives of acrylamide and acrylic acid is employed as a depressant for ... | 05/17/1988 |
| 4735783 | Process for increasing the selectivity of mineral flotation An aqueous solution containing a water soluble polyvalent metal sulphate, an alkali metal silicate and an alkali metal metabisulphite is described which is added to a slurry of a copper mineral bearing ore to be subjected to a froth flotation step for obt... | 04/05/1988 |
| 4710361 | Gold recovery by sulhydric-fatty acid flotation as applied to gold ores/cyanidation tailings Gold values are obtained from gold cyanidation tailings or gold bearing ores by treating the same with a flotation collector consisting of 5 to 20% xanthate collector and 80 to 95% fatty acid collector of a pulp pH range from 5 to 8.... | 12/01/1987 |
| 4663279 | Method of beneficiation of complex sulfide ores A method of beneficiation of complex sulfide ores comprises crushing and grinding complex sulfide ore containing sulfides of copper, zinc, iron and other minerals, subjecting the ground ores to differential flotation to obtain a bulk copper-zinc concentra... | 05/05/1987 |
| 4606764 | Method of recovering metals from ores using a formate reducing agent The invention comprises the treatment of metal oxides and mixed metal oxides and metal sulfides in a vertical tube reactor system having a downcomer section and a riser section in order to oxidize and dissolve the metal values in aqueous slurry primarily ... | 08/19/1986 |
| 4597791 | Gold recovery processes The present invention relates to a process for the separation of gold from particulate material containing gold, which comprises introducing a hydrophobic liquid, a non-gold particulate hydrophobic bulking material and particulate, gold containing materia... | 07/01/1986 |