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| Number | Title | Issue Date |
| 6958308 | Deposition of dispersed metal particles onto substrates using supercritical fluids A method for producing dispersed metal particles on a substrate and the compositions produced is disclosed. A method for producing the particles comprises exposing an organometallic and a particulate substrate to supercritical or near supercritical fluid under condi... | 10/25/2005 |
| 6551378 | Recovery of precious metals from low concentration sources A process for the recovery of gold and the platinum group metals from sources that contain relatively low amounts of the metals is described. The process is environmentally acceptable and uses no expensive and potentially dangerous organic solvents. The p... | 04/22/2003 |
| 6132491 | Method and apparatus for dissociating metals from metal compounds extracted into supercritical fluids A method for dissociating metal-ligand complexes in a supercritical fluid by treating the metal-ligand complex with heat and/or reducing or oxidizing agents is described. Once the metal-ligand complex is dissociated, the resulting metal and/or metal oxide... | 10/17/2000 |
| 5393322 | Process for recovering noble metals from solutions deriving from the treatment of nuclear fuels A process for recovering palladium, rhodium and ruthenium from aqueous solutions deriving from the treatment of nuclear fuels and containing also iron and nickel, by reducing carbonylation with carbon monoxide at a pressure up to 1 atmosphere in a nitric ... | 02/28/1995 |
| 5256187 | Separation of precious metals by an ion exchange process The present invention relates to the extraction and separation of low concentrations of precious group metals from acid chloride solutions, which are obtained by leaching catalytic converters, by utilizing a 8-hydroxyquinoline containing resin and a thiou... | 10/26/1993 |
| 5165901 | Platinum group metal recovery with a polyamine Rhodium and certain other PGM's in oxidation state III complex with chloride is precipitated from a solution by mixing with a polyamine, especially diethylene-triamine, in the presence of a protonating agent for the polyamine. High selectivity and high yi... | 11/24/1992 |
| 4979986 | Rapid oxidation process of carbonaceous and pyritic gold-bearing ores by chlorination A method of treating a gold-bearing ore to render the gold component of the ore more amenable to standard cyanidation treatment in a reduced amount of time is disclosed. An aqueous slurry of the gold-bearing ore is introduced into at least one vessel. An ... | 12/25/1990 |
| 4913730 | Recovery of gold from aqueous solutions Gold is recovered from aqueous solutions which include a solubilizing reagent by contacting the solution with hydrogen under selected conditions until the gold precipitates, and removing the precipitate from the solution. The reagent comprises a thiourea ... | 04/03/1990 |
| 4895596 | Method of recovering palladium catalyst An improved method of recovering a palladium catalyst from a liquid reaction mixture having been produced by oxidative coupling reaction of an aromatic compound in the presence of a catalyst containing palladium(II) salt is disclosed. The improved method ... | 01/23/1990 |
| 4754953 | Utilization of oxygen in leaching and/or recovery procedures employing carbon In gold and/or silver cyanide leaching-adsorption processes employing solid adsorbents such as activated charcoal, the overall efficiency in the recovery of gold and/or silver from ores or the like is greatly increased by contacting the cyanide slurry con... | 07/05/1988 |
| 4681628 | Gold Recovery processes The invention relates to a process for the recovery of gold from an alkaline aqueous liquid solution containing gold-cyanide ion, and possibly silver and/or copper and/or mercury, which comprises adding a quantity of thiourea to the solution so as to allo... | 07/21/1987 |
| 4654145 | Direct recovery of precious metals by solvent extraction and selective removal The direct recovery of precious metals, particularly gold and the platinum group metals, from chloride solutions, is achieved by solvent extraction and selective stripping/precipitation. Substituted quinolines are used as active extractant, in particular ... | 03/31/1987 |
| 4331520 | Process for the recovery of hydrogen-reduced metals, ions and the like at porous hydrophobic catalytic barriers This disclosure concerns primarily the recovery of hydrogen-reduced metals from aqueous solutions of salts thereof, by hydrogen reduction at a porous hydrophobic catalytic barrier, at ordinary temperatures, in an apparatus provided with means to supply hy... | 05/25/1982 |
| 4163664 | Process for precipitating precious metals from solutions which contain them Process for the practically total precipitation of precious metals from solutions which contain them, according to which said solutions are treated with carbon monoxide in the presence of a quantity of water or a primary or secondary alcohol at least equa... | 08/07/1979 |
| 4129441 | Recovery of silver from silver containing solutions Silver is precipitated from an aqueous sulphate solution containing dissolved silver and other metals at a temperature between about 60° C. and about 125° C. by hydrogen gas at a partial pressure between about 2 and about 5 kg/cm2.... | 12/12/1978 |
| 4105442 | Separation and purification of ruthenium A process for the separation or purification of ruthenium from solutions thereof comprising conversion of the ruthenium to nitrosylruthenium complex with the ruthenium in the Ru+2 oxidation state; conversion of the nitrosylruthenium complex to ... | 08/08/1978 |
| 4081271 | Process for separating and recovering rhodium and iridium from their mixtures with other precious metals Process for separating and recovering rhodium and/or iridium from the other precious metals (Pd, Pt, Ru, Os, Au, Ag), according to which a solution containing the precious metals in any form is treated for a time between 15 minutes and 10 hours with carbo... | 03/28/1978 |
| 3979207 | Refining of noble group metals This invention relates to the separation and purification of platinum group metals and, in particular to the separation of mixtures of rhodium, platinum and irridium. According to one specific form of the invention, the platinum, rhodium and iridium are p... | 09/07/1976 |
| 3967956 | Separation of noble metals This invention relates to a process for the separation of palladium present in aqueous solutions which also contain the salts of one or more of the platinum group metals platinum, rhodium, ruthenium, osmium and iridium. According to one embodiment of the ... | 07/06/1976 |
| 3966462 | Recovery of nitric acid soluble transition metals from sulfur and iron containing ores of the same The ore is subjected to nitric acid leaching and the leach solution is heated to a temperature at which one of the additional sulfur and iron values is selectively insolubilized with respect to the solution, while the other is maintained in solution for s... | 06/29/1976 |
| 3961943 | Process for recovering palladium The inactive palladium-containing precipitate formed during the reaction of a carboxylic acid and an olefin to form an ester can be reactivated by the addition of a suitable reducing agent to a slurry of the precipitate in the ester.... | 06/08/1976 |
| 3957506 | Catalytic water treatment to recover metal value A novel continuous reduction process is disclosed for recovering values of metals having a more positive reduction potential than hydrogen from an aqeuous solution. The process includes the steps of contacting the aqueous solution containing metal value i... | 05/18/1976 |
| 3957505 | Gold reclamation process Gold is recovered from gold bearing materials by dissolving gold in an iodide-iodine solution, precipitating gold with a reducing solution, removing the precipitated gold and then regenerating the iodide-iodine solution with an oxidizing agent.... | 05/18/1976 |
| 3956088 | Process for the destruction of developed and undeveloped photosensitive film and the recovery of products therefrom The destruction of developed or undeveloped photographic film in a manner which permits also the recovery of silver and organic components from the film material in which the film is subjected to wet oxidation at high temperature and high pressure in the ... | 05/11/1976 |
