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| Number | Title | Issue Date |
| 7025899 | Concentrated solutions of oxime metal extractants and method of formulating extractant compositions therefrom The preparation of concentrated solutions of oxime metal extractants, such as aldoximes and ketoximes, or mixtures of aldoxime and ketoxime, and the use thereof in formulating or preparing extraction reagent compositions for use in an extractant organic phase in a p... | 04/11/2006 |
| 6929677 | Method for leaching copper concentrate This invention relates to a method where sulfidic iron-bearing copper concentrate is leached on the countercurrent principle, in a chloride environment. The leaching takes place with the aid of bivalent copper and an oxygen-bearing gas as a multi-stage continuous pr... | 08/16/2005 |
| 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 |
| 5912402 | Metallurgical dust recycle process A treatment of metallurgical dust and recovery of valuable chemical commodities, comprising the steps of: leaching salts from the dust with water to create a washed EAF dust; reacting the washed EAF dust in a nitric acid solution resulting in a nearly com... | 06/15/1999 |
| 5820653 | Process for making shaped copper articles This invention relates to a process for making a shaped copper article directly from a copper-bearing material, comprising: (A) contacting said copper-bearing material with an effective amount of at least one aqueous leaching solution to dissolve copper i... | 10/13/1998 |
| 5616168 | Hydrometallurgical processing of impurity streams generated during the pyrometallurgy of copper Impurity streams generated during the metallurgy of copper are hydrometallurgically processed at ambient pressure for recovery of primary values in an energy-efficient manner and with the capture and conversion of metallic impurities to states that are ac... | 04/01/1997 |
| 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 |
| 5207996 | Acid leaching of copper ore heap with fluoroaliphatic surfactant Improved methods of heap leaching of copper ore with aqueous sulfuric acid solutions comprising a fluoroaliphatic surfactant are disclosed. The fluoroaliphatic surfactant increases the amount of copper values leached and recovered.... | 05/04/1993 |
| 5135567 | Method for producing metal powders from liquid phase containing metal ions The invention relates to a method for producing metal powders, where the employed raw materials are metal ions in a liquid phase. According to the invention, at a preliminary stage of the method the liquid phase containing metal ions is reduced with hydro... | 08/04/1992 |
| 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 |
| 4518420 | Winning metal from ore Copper is won from chalcopyrite ore (copper/iron sulphide) containing Cu(II) and Fe(III), which respectively prefer square planar and octahedral co-ordination. A vaporized tetradentate (square-planar) Schiff base reagent is passed through a fluidized bed ... | 05/21/1985 |
| 4497659 | Production of metals with low selenium contents Selenium is precipitated from solutions containing at least one metal selected from the group consisting of nickel, cobalt, copper, iron, zinc, manganese, magnesium, chromium and cadmium by adding chromous sulfate to the solution to precipitate selenium t... | 02/05/1985 |
| 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 |
| 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 |
| 4304644 | Autoclave oxidation leaching of sulfide materials containing copper, nickel and/or cobalt A process is provided for treating a matte for selective extraction of nonferrous metals using a single stage oxidative pressure leach wherein leaching is carried out in a continuous manner and relatively mild conditions on an aqueous slurry of the matte ... | 12/08/1981 |
| 4159232 | Electro-hydrometallurgical process for the extraction of base metals and iron A HYDROMETALLURGICAL PROCESS FOR THE ELECTROLYTIC RECOVERY OF SELECTED BASE METALS (ESPECIALLY COPPER OR POSSIBLY NICKEL) FROM SULPHIDE ORE CONCENTRATES CONCURRENTLY WITH THE EXTRACTION OF METALLIC IRON IN A COMMERCIALLY USABLE FORM. The process involves ... | 06/26/1979 |
| 4157912 | Process for recovery of copper and zinc from complex sulphides A process for treating thermally activated metal sulfides containing copper, iron and zinc for separate recovery of zinc as zinc sulfide in which the metal sulfides are subjected to a two-stage countercurrent acid leach for the formation of copper sulfide... | 06/12/1979 |
| 4148813 | Nickel and cobalt solvent extraction with mercaptides A novel class of extractants and a method of using the extractants in the hydrometallurgical recovery of nickel and cobalt metal. The extractants comprise a water immiscible organic solvent system containing solubilized mercaptide anions. In an important ... | 04/10/1979 |
| 4138248 | Recovery of elemental sulfur and metal values from tailings from copper recovery processes A process for the recovery of copper, molybdenum, gold and elemental sulfur in tailings from hydrometallurgical processing of copper sulfide ores, the process comprising concentrating the tailings containing elemental sulfur and copper, gold and molybdenu... | 02/06/1979 |
| 4097271 | Hydrometallurgical process for recovering copper and other metal values from metal sulphides A hydrometallurgical process for the separate recovery of non-ferrous, ferrous, and precious metal values and sulfur from metal sulfide ore concentrates by leaching of metal sulfides with a lixiviant containing ferric chloride, cupric chloride and chlorin... | 06/27/1978 |
| 4093526 | Hydrometallurgical leaching and refining of nickel-copper concentrates, and electrowinning of copper A multi-stage leaching process is provided for leaching and refining nickel-copper-sulfur concentrates, a substantial portion of the total nickel present being in an acid-soluble metallic form. The process employs a first stage atmospheric leach in combin... | 06/06/1978 |
| 4038361 | 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... | 07/26/1977 |
| 4036639 | Production of copper Substantially pure copper is produced from impure cupriferous materials by leaching the cupriferous material with an ammonium sulfate-containing ammoniacal solution in the presence of oxygen, followed by separating the copper-containing aqueous liquor fro... | 07/19/1977 |
| 4020143 | Use of raw manganese nodules for oxidation leaching of reductively roasted manganese nodules A metal recovery process in which copper, nickel, cobalt and molybdenum are recovered by reducing comminuted raw manganese nodules and leaching the reduced nodules with an aqueous ammoniacal solution to obtain a leach solution containing these metal value... | 04/26/1977 |
| 4013457 | Process for the recovery of cuprous chloride in the presence of metal impurities A process is disclosed for separating cuprous chloride from a solution comprising cuprous chloride and one or more of a number of metal impurities, the process comprising crystallizing the cuprous chloride from the solution in the presence of copper as cu... | 03/22/1977 |
| 3985553 | Process for the recovery of copper and ammonium sulphate from copper-bearing mineral sulphide ores or concentrates The process involves subjecting finely divided particles of copper-bearing mineral sulphide ores or concentrates to a first stage leach in which the particles are leached in an aqueous ammoniacal ammonium carbonate solution in the presence of free oxygen ... | 10/12/1976 |
| 3972711 | Cuprous chloride recovery process A process is disclosed for separating cuprous chloride from a solution comprising cuprous chloride and at least one metal chloride compatible with the solubility of cuprous chloride, the process comprising crystallizing the cuprous chloride from the solut... | 08/03/1976 |
| 3967957 | Aqueous ammonia oxidative leach and recovery of metal values Certain mineral values are recovered from source material such as ore, scrap metal, and mixtures in the presence of another metal thereof by aqueous ammonia leaching solution, and the mineral values are precipitated by ammonia from said solution as a comp... | 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 |
| 3965239 | 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... | 06/22/1976 |
| 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 |
