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| Number | Title | Issue Date |
| 8048390 | Method for the selective catalytic reduction of nitrogen oxides in exhaust gases of vehicles The invention relates to a method for the selective catalytic reduction of nitrogen oxides using ammonia in exhaust gases of vehicles, whereby solutions of guanidine salts with an ammonia forming potential of between 40 and 850 g/kg, optionally in combination with u... | 11/01/2011 |
| 7476371 | Dissolution of copper metal in aqueous alkanolamine to form copper containing aqueous solution Process for producing a copper-containing aqueous solution, in which a copper mass is dissolved in the presence of air in an aqueous leach liquor containing monoethanolamine and an acid, wherein the amount of acid equivalents is between 0.05 and about 0.7 times the ... | 01/13/2009 |
| 7361215 | Material and method for treatment of timber A material and method for treating timber. The material comprises a preservative and a carrier. The carrier is selected such that it remains mobile within the wood and provides for migration of the preservative within the treated wood. By providing a carrier which i... | 04/22/2008 |
| 7214644 | Cross-coupling reactions A method for producing a copper/palladium colloid catalyst useful for Suzuki couplings. ... | 05/08/2007 |
| 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 |
| 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 |
| 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 |
| 6337056 | Process for refining noble metals from auriferous mines A process for refining noble metals from auriferous mines, wherein the auriferous material is first milled and treated with a cyanide solution, and comprising: a step for the pretreatment of the auriferous material, wherein the complexes of cyanide with n... | 01/08/2002 |
| 6153155 | Recovery of the transition metal component of catalyst used in heavy feed hydroconversion The invention relates to a process for recovering the transition metal component of catalysts used in the hydroconversion of heavy hydrocarbonaceous materials. In accordance with the invention, a slurry of a transition metal catalyst and hydrocarbon is ca... | 11/28/2000 |
| 6049021 | Method for remediating sites contaminated with toxic waste Methods for decontaminating toxic waste, particularly solid carrier materials, such as soil contaminated with a toxin, or solid mixed wastes are more efficiently decontaminated with solvated electrons by first extracting the toxin from the carrier with a ... | 04/11/2000 |
| 5939034 | Process for the recovery of precious metal values from aqueous ammoniacal thiosulfate leach solutions The process of recovering precious metals from ores containing precious metals, such as gold and silver, from an aqueous ammoniacal thiosulfate leach solution to provide a significant practical and economical process for the recovery of gold or silver is ... | 08/17/1999 |
| 5788844 | Process for removing and recovering ammonia from organic metal extractant solutions in a liquid-liquid metal extraction process A process for removing and recovering ammonia from the organic extraction phase in a metal liquid-liquid extraction process in which at least one ammoniacal aqueous solution (either a leach feed solution containing the metal to be extracted or an aqueous ... | 08/04/1998 |
| 5492681 | Method for producing copper oxide A method for producing copper oxide. In the method, a copper bearing material, aqueous ammonia, and a sufficient amount of an ammonium salt to double the rate of production of copper oxide in the absence of the salt are placed in a single vessel. The vess... | 02/20/1996 |
| 5458746 | Process for making copper metal powder, copper oxides and copper foil This invention is directed to a process for making copper metal powder from copper-bearing material, comprising: (A) contacting said copper-bearing material with an effective amount of at least one aqueous leaching solution to dissolve copper ions in said... | 10/17/1995 |
| 5366599 | Method of selective recovery of ferrous and nonferrous metals from industrial wastes and scrap home electric appliances After optional preliminary treatment, solid wastes are processed in accordance with the flowsheet FIG. 1: first, Cu is leached selectively with a leaching solution containing Cu(II) ammine as a leachant according to the autooxidation or the autocatalytic ... | 11/22/1994 |
| 5354359 | Hydrometallurgical process for the recovery of precious metal values from precious metal ores with thiosulfate lixiviant A hydrometallurgical process for the recovery of precious metal values from refractory precious metal ore materials containing preg-robbing carbon by leaching with a thiosulfate lixiviant, the process comprising a. providing a body of particles and/or particul... | 10/11/1994 |
| 5332560 | Process for the removal of zinc and nickel from copper ammine sulfate solutions A method for the recovery of copper from copper-containing materials, for example, scrap, ores or dust. An aqueous cupric tetrammine sulfate lixiviant is contacted with the copper-containing material to produce a leachate containing cuprous, nickel, and z... | 07/26/1994 |
| 5328669 | Extraction of precious metals from ores and other precious metal containing materials using halogen salts Platinum group metals, gold and silver are extracted from complex ores, automobile scrap, refractory ores and as naturally occurring by leaching the precious metal containing materials with a solution containing halogen salts such as potassium or sodium i... | 07/12/1994 |
| 5304284 | Methods for etching a less reactive material in the presence of a more reactive material A method is described for providing a body of first material and a body of second material in a chemical environment wherein the first material contains first constituents having a lower and higher oxidation state and wherein the second material contains ... | 04/19/1994 |
| 5264191 | Quaternary ammonium trihalide and method for dissolution of metal with liquid containing the compound A quaternary ammonium trihalide, a novel compound, represented by the formula: [A--R']+ .multidot.X3- (wherein A stands for a trialkyl-amino radical or a pyridyl radical, R' for an alkyl radical of 6 to 22 carbon atoms, and X f... | 11/23/1993 |
| 5263044 | Remelting method for recognition and recovery of noble metals and rare metals Method for recognition of noble metals otherwise not recognizable in base material clusters includes using an electron beam furnace in which base material clusters are vaporized by means of an electron beam gun, and the vaporized materials are condensed a... | 11/16/1993 |
| 5188713 | Process for recovery of metal A process for recovery of metal from a feedstock comprising copper is provided. The process comprises the steps of: (a) contacting the feedstock with an aqueous mixture comprising ammonium nitrate having a concentration greater than about 1.5M and sulphuric ac... | 02/23/1993 |
| 5176802 | Treatment of copper sulfide concentrates A hydrometallurgical method is provided for recovering copper from particulate copper sulfide flotation concentrate containing at least about 20% copper by weight as cuprous and cupric sulfide, a significant portion of the copper in the copper sulfide con... | 01/05/1993 |
| 5173276 | Method for recovery of copper from copper-containing materials A process for precipitating solid hydrates of cupric tetrammine sulfate from a solution, wherein the solution contains at least 40 grams per liter of free ammonia, at least 50 grams per liter of ammonium sulfate and wherein the temperature of the solution... | 12/22/1992 |
| 5137700 | Processes employing iodine-iodide etching solutions Aqueous iodine-iodide etching solutions are employed in the recovery of precious metals. Elemental iodine is precipitated from spent etching solutions and used to supply both the iodine and iodide of new etching solutions. Prior to extraction of the eleme... | 08/11/1992 |
| 5114687 | Ammonia extraction of gold and silver from ores and other materials Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia, ammonium salts and one or more oxidants. The process is particularly effective for refractory gold ores including... | 05/19/1992 |
| 5061459 | Prevention of copper dissolution during cyanidation of gold ores A process for treating copper containing precious metal ores prior to cyanidation and recovery of the precious metal eg gold. The process involves addition to the ore before or after milling of a water soluble or water dispersible surface active agent in ... | 10/29/1991 |
| 4956154 | Selective removal of chromium, nickel, cobalt, copper and lead cations from aqueous effluent solutions Aqueous effluent solutions containing metal cations may be treated with an extractant comprising an organophosphinic acid, a di-2-ethylhexyl phosphoric acid and/or an aliphatic amine to selectively separate chromium, nickel, cobalt, copper and lead cation... | 09/11/1990 |
| 4919716 | Method for dissolution of metal A metal is dissolved by being brought into contact with at least one halogenated hydrocarbon in the presence of a cationic surfactant.... | 04/24/1990 |
| 4902345 | Treatment of refractory carbonaceous and sulfidic ores or concentrates for precious metal recovery The recovery of precious metals from refractory carbonaceous and sulfidic ores or concentrates is improved by subjecting an oxidized slurry of this type of ore to thiourea leaching in the presence of carbon instead of subjecting the slurry to cyanidation ... | 02/20/1990 |
| 4816235 | Silver and manganese recovery using acidified thiourea A method for obtaining silver and manganese metal from a silver-manganese ore includes the step of leaching the ore with acidified thiourea. More specifically, the method includes the step of leaching the ore with an acidic thiourea solution to form a lea... | 03/28/1989 |
| 4731113 | Method for the recovery of precious metals from ores A process for the recovery of precious metals from ore containing the same is disclosed. The process includes the formation of a lixiviant solution including a thiourea compound, urea and an alkali lignin sulfonate. The ore is then exposed to this lixivia... | 03/15/1988 |
| 4654078 | Method for recovery of precious metals from difficult ores with copper-ammonium thiosulfate Precious metals such as gold and silver are recovered from difficult-to-treat ores, especially those containing manganese and/or copper, by lixiviating the ores using copper-ammonium thiosulfate in which the pH of the lixiviating solution is maintained at... | 03/31/1987 |
| 4645535 | Method for the recovery of precious metals from ores A process for the recovery of precious metals from ore containing the same is disclosed. The process includes the formation of a lixiviant solution including a thiourea compound, urea and potassium lignin sulfonate. The ore is then exposed to this lixivia... | 02/24/1987 |
| 4500498 | Ammonium chloride-ammonium hydroxide strip for the recovery of anhydrous zinc chloride Anhydrous zinc chloride is produced from an aqueous feed solution containing zinc chloride from an aqueous feed solution containing zinc chloride. The zinc chloride is extracted onto an organic extractant known to the art such as tributyl phosphate, prima... | 02/19/1985 |
| 4452633 | Method for producing cobalt metal powder In a process for producing fine size cobalt metal powder from scrap material containing brazing compositions, the silver ions are removed by cementation with iron to form an insoluble mixture which is subsequently treated with concentrated hydrochloric ac... | 06/05/1984 |
| 4369061 | Recovery of precious metals from difficult ores Precious metals such as gold and silver are recovered from difficult-to-treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.0... | 01/18/1983 |
| 4343773 | Enhanced leaching of minerals which form product layers A novel process for enhancing the leaching rate of a mineral wherein the mineral is characterized by the tendency to form a reaction product layer during leaching. A suitable particulate modifier such as carbon is mixed with the mineral prior to leaching ... | 08/10/1982 |
| 4343781 | Decomposition of 2KCl.CuCl to produce cuprous chloride and potassium chloride Cuprous chloride is produced from the complex salt, 2KCl.CuCl, obtained as a by-product in the copper industry where chalcopyrite is decomposed in the presence of potassium chloride, by a series of steps involving reaction of an aqueous solution of the co... | 08/10/1982 |
| 4269622 | Recovery of precious metals from difficult ores Precious metals such as gold and silver are recovered from difficult-to-treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.5... | 05/26/1981 |
