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| Number | Title | Issue Date |
| 8177881 | Method for extracting and separating rare earth elements Solvent extraction from an aqueous phase containing first and second rare earth elements is carried out by contacting an organic phase containing a diglycolamic acid as an extractant and a hydrocarbon or a low-polar alcohol as a solvent, with the aqueous phase below... | 05/15/2012 |
| 7513931 | Process for recovering platinum group metals, rhenium and gold Processing for the extraction of metals consisting of platinum, palladium, iridium, rhodium, osmium, ruthenium, rhenium and gold (PGMRA) includes dissolution of the PGMRA metals from solid materials in an acidic aqueous solution, preferably with a halogen acid sparg... | 04/07/2009 |
| 7220809 | Optical material containing fluorine-containing polymer having functional group There is provided an optical material obtained from an organic composition which is suitable for an optical material in optical communication and comprises a fluorine-containing polymer having functional group and a rare earth metal ion, in which the fluorine-contai... | 05/22/2007 |
| 7211635 | Optical material containing curable fluorine-containing polymer There can be obtained a suitable optical material which has a stable structure with a rare earth metal ion while maintaining transparency in a region of from visible light to near infrared light. The optical material is obtained by curing a fluorine-containing resin... | 05/01/2007 |
| 6176895 | Polymers for metal extractions in carbon dioxide A composition useful for the extraction of metals and metalloids comprises (a) carbon dioxide fluid (preferably liquid or supercritical carbon dioxide); and (b) a polymer in the carbon dioxide, the polymer having bound thereto a ligand that binds the meta... | 01/23/2001 |
| 6054495 | Synthesis of unagglomerated metal nano-particles at membrane interfaces The present invention relates to a powder of unagglomerated metallic particles. More particularly, the present invention relates to a powder of unagglomerated metallic particles having an average diameter of about 1-100 nm and the process for making the s... | 04/25/2000 |
| 5993668 | Method for removing metal ions and/or complexes containing metal ions from a solution Metal ions and/or complexes of metal ions are removed from a solution by formation of an insoluble chelated complex of the metal ions and a polymeric precipitating agent. A two-step process of mixing the influent with the precipitating agent is used to in... | 11/30/1999 |
| 5876480 | Synthesis of unagglomerated metal nano-particles at membrane interfaces The present invention relates to a powder of unagglomerated metallic particles. More particularly, the present invention relates to a powder of unagglomerated metallic particles having an average diameter of about 1-100 nm and the process for making the s... | 03/02/1999 |
| 5833937 | Polymeric combinations used as copper and precious metal heap leaching agglomeration aids An improved method for extracting a precious metal from mineral fines by heap leaching with dilute sulfuric acid which comprises agglomerating the mineral fines prior to formation into a heap with an agglomerating agent composition comprising sequential a... | 11/10/1998 |
| 5695645 | Methods for removing silver from spent photoprocessing solution Spent solutions from photographic processors are fed into a conduit (18) to which subsequently are added precipitating agents from a first source (22) and flocculating agents from a second source (28); so that, well grown or ripened clumps of flocculated ... | 12/09/1997 |
| 5668219 | Cationic block polymer agglomeration agents for mineral bearing ores A process for the percolation leaching of minerals from a mineral-beating ore comprises agglomerating the mineral-bearing ore with an agglomerating agent of a cationic block copolymer having a polymeric segment and a block containing an ammonium cation op... | 09/16/1997 |
| 5578245 | Method of preparing a stable colloid of submicron particles The invention provides submicron particles. The invention further provides submicron particles which are dispersed in an aqueous colloid. The invention further provides a method of forming the stable dispersion which includes providing an ion exchange res... | 11/26/1996 |
| 5512636 | Cationic graft polymer agglomeration agents for mineral bearing ores Agglomerating agent and method for use in heap leaching of mineral bearing ores. Cationic polymers alone or in combination with cement or lime are highly effective agglomerating agents in acidic or alkaline leaching operations. The cationic polymers are p... | 04/30/1996 |
| 5484470 | Enhancement of gold lixiviation using nitrogen and sulfur heterocyclic aromatic compounds An improved process for dissolving gold metal in ligand and oxidant lixiviation systems, wherein the solubility of gold is enhanced by the addition of heterocyclic aromatic compounds containing nitrogen or sulfur in the ring.... | 01/16/1996 |
| 5458787 | Extraction of certain metal cations from aqueous solutions Carbonaceous pyropolymers possessing recurring units containing at least carbon and hydrogen atoms on their surface are effective in removing from solution metal cations having a standard reduction potential to their zerovalent state of greater than -0.2 ... | 10/17/1995 |
| 5411667 | Method of selectively separating lead ions A method of selectively separating lead ions from metal ions-containing aqueous liquid by contact with a solution containing a polyether derivative dissolved in a water-insoluble organic solvent and serving as an ionophore or carrier for lead ions. The po... | 05/02/1995 |
| 5332420 | Chemical process of separating metals from an organic complex A method for the recovery of a metal from an organic complex thereof, said method comprising treating the complex with a weakly acid aqueous solution of an alkali metal or alkaline earth metal chloride having a chloride content of at least 4 molar whereby... | 07/26/1994 |
| 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 |
| 4992200 | 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 subsequentily ... | 02/12/1991 |
| 4857159 | Electrodeposition recovery method for metals in polymer chelates The process of the present invention for the recovery of metal ions from a polymeric chelating agent stream or solution comprises the circulation of a loaded polymeric chelating agent stream or solution through an electrolytic recovery cell. The chelating... | 08/15/1989 |
| 4834951 | Common separation of contaminating elements from electrolyte solutions of valuable metals A process for the common or simultaneous separation of arsenic, antimony, bismuth and iron from electrolyte solutions of valuable metals by solvent extraction and subsequent recovery of the contaminating elements, which process is characterized in that aq... | 05/30/1989 |
| 4828606 | Process for preparing intermetallic compounds or hydrides thereof Intermetallic compounds and hydrides thereof, characterized in that they have been prepared by reacting hydrides of the elements of the main groups I, II, III and IV of the Periodic Table, magnesium hydridehalides or magnesium dialkyls having the general ... | 05/09/1989 |
| 4765834 | Process for the recovery of metal values A process for the selective concentration of metal values in solution wherein said metal-containing solution is contacted with a multiple-phase system having a common solvent, thereby causing the preferential migration of metal values into one phase of sa... | 08/23/1988 |
| 4762556 | Selective extraction of gold Gold is selectively extracted from an aqueous solution by contacting the gold-containing solution, which may contain other metals, with a resin which is a diallylamine homopolymer or copolymer, and then separating the resin from the solution.... | 08/09/1988 |
| 4631177 | Method for recovering gallium A method for recovering gallium from an aqueous solution containing gallium, which comprises contacting the aqueous solution containing gallium to a porous polymer having a water-insoluble substituted quinolinol retained therein, to let the polymer adsorb... | 12/23/1986 |
| 4619744 | Recovery of heavy metals from aqueous solutions Process for the recovery of heavy metals from aqueous solution by reaction with soluble, functionally-substituted polymer upon which the heavy metal loads, and optionally crosslinks by interaction with the heavy metals present in solution. Metals includin... | 10/28/1986 |
| 4605504 | Chromatographic separation of metals with polyetherurethane particles The invention relates to polyetherurethane particles having absorptive activity whereby these particles may be applied for the extractions or the separations of metal ions from liquids, e.g. from waste liquors leaving galvanizing, printing and metal worki... | 08/12/1986 |
| 4582689 | Solvent extraction process Improved solvent extraction processes for recovery of copper values from aqueous solutions which also contain dissolved iron values. In continuous, multiple stage, solvent extraction circuits, the overall copper/iron selectivity of reagents including hydr... | 04/15/1986 |
| 4581220 | Process for the extraction of metal values and novel metal extractants Metal values are extracted from aqueous solutions of metal salts containing halide or pseudo halide ions by pyrimidine, pyrazine or pyridazine derivitives bearing the substituent --(C.dbd.O.X)n where X is the group --OR1 or --NR... | 04/08/1986 |
| 4565673 | Process for eluting indium from a chelate resin containing adsorbed indium A process for eluting indium from a chelate resin having a phosphorus atom-containing, chelate-forming group which contains adsorbed indium, which comprises contacting said resin firstly with a primary eluent containing an acid containing no halogen atom ... | 01/21/1986 |
| 4551213 | Recovery of gold Gold values are recovered from mixtures thereof contained with sulfur, especially mixtures obtained from the hydrometallurgical processing of copper. The process comprises the following steps: (a) forming an aqueous suspension of the mixture containing the gol... | 11/05/1985 |
| 4372830 | Recovery of gold in gold plating processes A process is described involving gold in which gold cyanide ion (e.g., potassium gold cyanide) is removed from an aqueous solution (typically a water rinse solution) by absorption on an anion-exchange resin and the gold cyanide ion is then removed from th... | 02/08/1983 |
| 4329210 | Method of regenerating etchant and recovering etched metal A method of regenerating etchant and recovering etched metals. Etching solution, which is overladen with metal cations is passed through a cation exchange unit. Subsequently, the etching solution, which is diminished in metal cation concentration, is retu... | 05/11/1982 |
| 4298380 | Process for purifying low-melting metals from impurities According to the invention a process is proposed for purifying low-melting metals from impurities, residing in that a melt of a low-melting metal is treated with an aqueous solution of an inorganic acid or an alkali in the presence of organic compounds wi... | 11/03/1981 |
| 4283224 | Separative treatment of anode slime A hydrometallurgical process is provided for the separative treatment of electrometallurgical anode slime containing precious metals and substantial amounts of tin dioxide and lead sulfate. The process is especially suited for treatment of anode slimes fr... | 08/11/1981 |
| 4168971 | High efficiency gold recovery method A method and system for recovering gold and other noble metals from geologic bodies of fresh and salt water wherein a mixture of water and sediment is drawn from the body of water, passed as an influent through a cation exchanger of the type containing cr... | 09/25/1979 |
| 4145212 | Process for recovering silver and optionally gold from a solid starting material containing said metals The invention relates to a process for recovering silver and possibly gold contained in a silver and possibly gold bearing solid starting material, in which said metals are present in low proportions, a part thereof being in the form of free sulphides, po... | 03/20/1979 |
| 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 |
| 3954452 | Process for separating Cd from Zn by cementation Materials dissolved in water are separated from each other by means of a cementation agent. The materials treated are those having a greater hydrogen overpotential than the potential difference between the cementation agent and hydrogen gas. A water solut... | 05/04/1976 |
