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| Number | Title | Issue Date |
| 7985277 | Process for extracting gold from gold-bearing ore A process for extracting gold from a gold-bearing ore. The process includes, first, providing a leaching liquor with thiosulfate anion and ethylenediamine. Next, the leaching liquor is contacted with the gold-bearing ore to form a pregnant leach solution including g... | 07/26/2011 |
| 7918919 | Process for mercury control during pressure oxidation A method for suppressing mercury dissolution during pressure oxidation of precious metal-containing materials in the presence of halogens and halides is provided. Pressure oxidation is performed under controlled oxidative conditions to maintain the mercury predomina... | 04/05/2011 |
| 7799114 | Method for recovering gold The invention relates to a method for recovering gold in connection with the hydrometallurgical production of copper from a waste or intermediate product containing sulphur and iron that is generated in the leaching of the copper raw material. The recovery of both c... | 09/21/2010 |
| 7776135 | Method for the recovery of gold The invention relates to a method for the recovery of gold in connection with the hydrometallurgical production of copper from a residue or intermediate product containing sulphur and iron generated in the leaching of copper raw material. The recovery of both copper... | 08/17/2010 |
| 7704298 | Method for thiosulfate leaching of precious metal-containing materials Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polyth... | 04/27/2010 |
| 7572317 | Thiosulfate generation in situ in precious metal recovery Precious metal recovery by thiosulfate leaching where thiosulfate lixiviant is generated in situ employing elemental sulfur generated from partial oxidation of sulfidic precious metal-bearing feed and/or employing reactants from processing effluent. ... | 08/11/2009 |
| 7559974 | Method for thiosulfate leaching of precious metal-containing materials Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polyth... | 07/14/2009 |
| 7559973 | Precious metal recovery using thiocyanate lixiviant For removal of precious metal from thiocyanate leach solution, precious metal is transferred from precious metal-thiocyanate complex to precious metal-cyanide complex. Preparation of thiocyanate leach solution includes dissolving cyanide in an aqueous liquid and con... | 07/14/2009 |
| 7547348 | Method for the recovery of metals using chloride leaching and extraction The invention relates to a method for the recovery of metals, in particular copper, from a copper-bearing raw material, whereby the material is leached into a chloride-containing solution. The leaching of the raw material is performed oxidatively and at a sufficient... | 06/16/2009 |
| 7544231 | Recovery of platinum group metals A process of recovering platinum group metals (PGMs) from a pregnant solution or leachate containing PGM values and base metals, typically a cyanide solution or leachate. A non-selective precipitation of the PGM values and base metals to form an insoluble precipitat... | 06/09/2009 |
| 7544232 | Method for thiosulfate leaching of precious metal-containing materials Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ heap leaching or lixiviants that include one or more blinding agents. ... | 06/09/2009 |
| 7537640 | Precious metal recovery using thiocyanate lixiviant A heap with precious metal-containing mineral material with precious metal locked within sulfide mineralization is subjected to bio-oxidation followed by acidic thiocyanate leaching to dissolve precious metal. Sulfide sulfur is oxidized during both of the bio-oxidat... | 05/26/2009 |
| 7416712 | Method for obtaining cobalt and nickel from ores and ore concentrates The invention relates to a method for obtaining metals from a cobalt and/or nickel arsenic sulfide ore or ore concentrate and/or a cobalt and/or nickel sulfide ore or ore concentrate, according to which the cobalt and/or nickel arsenic sulfide ore or ore concentrate... | 08/26/2008 |
| 7341700 | Method for recovery of metals from metal-containing materials using medium temperature pressure leaching The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials using controlled, super-fine grinding and medium temperature pressure leaching. Processes embodying aspects of the present invention may... | 03/11/2008 |
| 7314604 | Stable ferric arsenate precipitation from acid copper solutions whilst minimising copper losses A method of which includes the steps of introducing an acidic solution containing (V), copper, ferric iron and ferrous iron into a first tank of a series of continuously stirred tank reactors and, in the first tank, adding air to the solution; heating the solution t... | 01/01/2008 |
| 7311754 | Molecular decomposition processes for the synthesis of nanosize metallic powders A method for synthesizing nanosize metallic powders can include providing a metallic precursor. The metallic precursor can include a metal alloy formed having a fugitive constituent and a target metal. The fugitive constituent and target metal are chosen such that t... | 12/25/2007 |
| 7309353 | Use of platinum group metals in vascular devices and method of texturing platinum group metals A method of texturing polycrystalline iridium includes the steps of cold/warm working of the polycrystalline iridium at equal to or below its re-crystallization temperature to break up the polycrystalline structure such that the orientation favors one direction (i.e... | 12/18/2007 |
| 7291202 | Process for mutual separation of platinum group metals A process for mutual separation of platinum group metals (PGM), wherein highly stable compounds and steps are used to efficiently remove impurity elements while preventing increase of impurity content relative to that of the PGM in the mother liquor and also prevent... | 11/06/2007 |
| 7282080 | Process for extracting platinum group metals PGMs can be extracted from a source material by heat-treating the source material to form a residue containing PGMs in a cyanide leachable condition and, thereafter, cyanide leaching the residue using a solution containing cyanide to form a pregnant cyanide leach li... | 10/16/2007 |
| 7237574 | Controlled dispersion multi-phase nozzle and method of making the same A nozzle design and method for designing such a nozzle being adapted for three phase slurry flow from the choke into the flash tank during pressure let-down in autoclave mining operations that uses a selection of the expansion ratio in the choke to select a nozzle d... | 07/03/2007 |
| 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 |
| 7166145 | Recovery of precious metals This invention relates to the recovery of precious metals and, more particularly, to the recovery of precious metals, such as platinum group metals, gold and rhenium, from various sources using a solution comprising at least one ammonium salt, at least one halogen s... | 01/23/2007 |
| 7156894 | Method for recovering metal values from concentrates of sulfide minerals A method of recovering precious metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from a crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refra... | 01/02/2007 |
| 7128840 | Ultrasound enhanced process for extracting metal species in supercritical fluids Improved methods for the extraction or dissolution of metals, metalloids or their oxides, especially lanthanides, actinides, uranium or their oxides, into supercritical solvents containing an extractant are disclosed. The disclosed embodiments specifically include e... | 10/31/2006 |
| 7067090 | Recovery of platinum group metals This invention relates to the recovery of platinum group metals and, more particularly, to the recovery of platinum group metals from various sources by roasting the source material with one or more of sulfuric acid, a sulfate and/or a bi-sulfate and with one or mor... | 06/27/2006 |
| 7066983 | Method for thiosulfate leaching of precious metal-containing materials Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polyth... | 06/27/2006 |
| 7041152 | Method for processing elemental sulfur-bearing materials using high temperature pressure leaching The present invention relates generally to a process for the production of sulfuric acid and liberation of precious metal values from materials containing sulfur through pressure leaching operations. In accordance with various aspects of the present invention, the s... | 05/09/2006 |
| 7037357 | Recovery of metals from jarosite-containing materials A method to dissolve at least one metal from jarosite or other iron hydroxyl sulphate containing-material which includes the steps of subjecting the material to alkaline treatment in a brine solution to facilitate jarosite decomposition, and acidification of the bri... | 05/02/2006 |
| 7033480 | Process for recovering platinum group metals from material containing base metals The process of the present invention recovers platinum group metal(s), such as platinum and palladium, from PGM-containing materials containing base metals, such as copper and nickel. The process controls sulfur levels by using solvent extraction 306 to remov... | 04/25/2006 |
| 7025942 | Control of lead nitrate addition in gold recovery A method for controlling the extraction of gold from a gold ore by the cyanidation process in which a leaching step including the addition of a lead compound, which is typically lead nitrate or other lead salt, is used. In order to maintain stable conditions in the ... | 04/11/2006 |
| 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 |
| 6977050 | Synthesis of lignosulfonic acid-doped polyaniline using transition metal ion catalysts The present invention relates to a method of synthesizing lignosulfonic acid-doped polyaniline by oxidatively polymerizing aniline in the presence of transition metal ions selected from the group consisting of Ag(I), Fe(II), and Fe(III) salts. The present invention ... | 12/20/2005 |
| 6972107 | System for direct electrowinning of copper A system and process for recovering copper from a copper-containing ore, concentrate, or other copper-bearing material to produce high quality cathode copper from a leach solution without the use of copper solvent extraction techniques or apparatus. A process for re... | 12/06/2005 |
| 6923922 | Recover and recycle rhodium from spent partial oxidation catalysts A method for the recovery of rhodium from spent supported catalysts. In one embodiment, a method for recovering rhodium from a host material includes roasting the host material in air at a temperature sufficient to convert at least a portion of rhodium to Rh2 | 08/02/2005 |
| 6919030 | Process for recovering cyanide from copper-containing feed material A process for recovering cyanide from feed material containing cyanide and copper involves the steps of: (a) contacting the feed material with a strong base anion exchange resin whereby copper and cyanide from the feed material are adsorbed onto the resin; (b) conta... | 07/19/2005 |
| 6893482 | Method for improving metals recovery using high temperature pressure leaching The present invention is directed to a system for recovering metal values from metal-bearing materials. During a reactive process, a seeding agent is introduced to provide a nucleation site for the crystallization and/or growth of solid species which otherwise tend ... | 05/17/2005 |
| 6884280 | Heat transfer in heap leaching of sulphide ores A method of leaching sulphide mineral concentrates wherein heat generated by bioleaching of sulphide mineral concentrates in at least one reactor is transferred into a heap in which bio-assisted leaching takes place. ... | 04/26/2005 |
| 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 |
| 6852237 | Method for improved recovery of metals Methodology for the extraction of metallic elements from solid and liquid metal-contaminated starting material such as mineral ores, recyclable wastes, contaminated soils, engraving solutions, metal finishing solutions, battery manufacturing solutions, toxic wastes ... | 02/08/2005 |
| 6835230 | Method for leaching zinc concentrate A method of leaching zinc from a zinc concentrate comprising leaching a zinc concentrate in an aqueous solution containing free sulfuric acid and ferric ions, whereby elemental sulfur is deposited on the zinc concentrate, and grinding the zinc concentrate under atmo... | 12/28/2004 |
