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| Number | Title | Issue Date |
| 7214644 | Cross-coupling reactions A method for producing a copper/palladium colloid catalyst useful for Suzuki couplings. ... | 05/08/2007 |
| 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 |
| 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 |
| 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 |
| 5320720 | Extraction of precious metals from ores thereof Increased efficiency of extraction of silver and gold from ore materials thereof containing active carbonaceous material is obtained by conducting the extraction in two stages. In a first stage a portion of the silver and of the gold when present is extra... | 06/14/1994 |
| 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 |
| 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 |
| 4778519 | Recovery of precious metals from a thiourea leach A method is provided for recovering gold and silver from precious metal bearing materials including ores, leaching residues, flue dust, electronic scrap, jewelry scrap, etc. In the method, the gold and silver are extracted from the precious metal bearing ... | 10/18/1988 |
| 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 |
| 4369164 | Recovery of copper from arsenical drosses by ammonium arsenate leach A process for leaching copper and arsenic from copper dross containing copper arsenide and separated from molten lead bullion comprises leaching the dross with an aqueous ammoniacal solution containing arsenate as the predominant anion under oxidizing con... | 01/18/1983 |
| 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 |
| 4331635 | Recovery of copper and/or nickel and/or zinc Copper, nickel and zinc are recovered from sulfide minerals or concentrates thereof by leaching with ammonia at or near atmospheric pressure. A slurry of such minerals or concentrates in an aqueous solution containing free ammonia is passed into a closed ... | 05/25/1982 |
| 4322390 | Hydrometallurgical recovery of copper, cobalt nickel with reductive and oxidative leaching Desired metal values are recovered from metal-bearing sources by subjecting said metal-bearing sources to a reduction step which is effected in an aqueous solution of an ammoniacal ammonium salt containing a reducing reagent such as hydrazine, hydroxylami... | 03/30/1982 |
| 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 |
| 4153522 | Sulfate precipitation during oxidative ammonium leach of Cu, Ni, Zn sulfide ores In the recovery of copper, nickel or zinc from sulfide ores by leaching with ammonium sulfate solution containing free ammonia in the presence of oxygen to form a leach solution containing dissolved copper, nickel or zinc ammonia sulfate complex, an alkal... | 05/08/1979 |
| 4085188 | Reduction leaching of raw sea nodules with sulfides A process for extracting metal values from sea nodules is provided in which nickel, cobalt and copper values are selectively extracted by leaching raw sea nodules in an aqueous ammoniacal medium in the presence of a reducing agent for tetravalent manganes... | 04/18/1978 |
| 3988416 | Elevated pressure operation in the cuprion process A process in which copper, nickel, cobalt and molybdenum are recovered by direct leaching of comminuted raw manganese nodules with an aqueous ammoniacal leach solution containing cuprous ions. During the process cuprous ions are consumed and are oxidized ... | 10/26/1976 |
| 3983017 | Recovery of metal values from manganese deep sea nodules using ammoniacal cuprous leach solutions A process in which copper, nickel, cobalt and molybdenum are recovered by direct leaching of comminuted raw manganese nodules with an aqueous ammoniacal leach solution containing cuprous ions. During the process cuprous ions reduce the nodules, are consum... | 09/28/1976 |
| 3976500 | Method for dissolving non-ferrous metals Non-cyanide alkaline aqueous solutions for stripping non-ferrous metals, especially copper, from ferrous metal such as, for example, steel. The stripper solution comprises a water-soluble nitrate, a water-soluble compound of the formula ##EQU1## ... | 08/24/1976 |
| 3971652 | Ammoniacal extraction of copper from metallic materials A method of leaching copper values from copper dross obtained from pyro-metallurgical lead bullion by contacting finely-divided particles of the copper dross with an aqueous ammoniacal solution, preferably a solution of ammonium carbonate and ammonium hyd... | 07/27/1976 |
| 3967958 | Method of winning copper, nickel, and other metals The invention is a process for winning nickel by treating an aqueous ammonium salt solution of nickel salts with a carbon monoxide-containing gas under reducing conditions to produce nickel carbonyl and subsequently recovering nickel therefrom. Optionally... | 07/06/1976 |
