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| Number | Title | Issue Date |
| 7341700 | Method for recovery of metals from metal-containing materials using medium temperature pressure leaching The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials using controlled, super-fine grinding and medium temperature pressure leaching. Processes embodying aspects of the present invention may... | 03/11/2008 |
| 7156894 | Method for recovering metal values from concentrates of sulfide minerals A method of recovering precious metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from a crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refra... | 01/02/2007 |
| 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 |
| 6833021 | Method for treating precious metal bearing minerals A method of processing a mineral composition comprising a refractory material the method comprising milling the composition to a particle size of P80 of less than 25 microns and leaching said composition with a solution comprising lime and/or limestone in... | 12/21/2004 |
| 6676909 | Method for recovery of metals from metal-containing materials using medium temperature pressure leaching The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials using controlled, super-fine grinding and medium temperature pressure leaching. Processes embodying aspects of the present in... | 01/13/2004 |
| 6608001 | Catalyst and method of making micrometer sized spherical particles A method for producing small spherical particles that are especially useful as catalysts and catalyst supports employed in chemical processes is disclosed. According to some embodiments, the method includes impregnating a porous support with a metal or me... | 08/19/2003 |
| 6569224 | Hydrometallurgical process for the recovery of nickel and cobalt values from a sulfidic flotation concentrate A hydrometallurgical process for the recovery of nickel and cobalt values from a sulfidic flotation concentrate. The process involves forming a slurry of the sulfidic flotation concentrate in an acid solution, and subjecting the slurried flotation concent... | 05/27/2003 |
| 6537796 | Conversion of geothermal waste to commercial products including silica A process for the treatment of geothermal residue includes contacting the pigmented amorphous silica-containing component with a depigmenting reagent one or more times to depigment the silica and produce a mixture containing depigmented amorphous silica a... | 03/25/2003 |
| 6455018 | Recovery of precious metal and other values from spent compositions/materials Precious metal values, e.g., platinum, palladium and rhodium, and, optionally, other valuable elements, e.g., one or more rare earths and cerium in particular, are recovered from a wide variety of compositions of matter and articles of manufacture, for ex... | 09/24/2002 |
| 6428604 | Hydrometallurgical process for the recovery of nickel and cobalt values from a sulfidic flotation concentrate A hydrometallurgical process for the recovery of nickel and cobalt values from a sulfidic flotation concentrate. The process involves forming a slurry of the sulfidic flotation concentrate in an acid solution, and subjecting the slurried flotation concent... | 08/06/2002 |
| 6296679 | Method for hydrocarbon steam reforming In a process for hydrocarbon steam reforming, a primary reformed gas is produced from a mixed gas of hydrocarbon and steam with use of a primary reforming means including an external combustion type of reforming furnace. A secondary reforming reaction of ... | 10/02/2001 |
| 6277341 | Process for the rapid leaching of chalcopyrite in the absence of catalysts A process is provided for the leaching of copper from chalcopyrite using ferric sulfate in which acceptable rates of leaching are achieved by controlling the surface potential of the chalcopyrite to an empirically determined "window" within the broad rang... | 08/21/2001 |
| 6110254 | Method for chemical precipitation of metallic silver powder via a two solution technique A method for the chemical precipitation of metallic silver powder employs a two solution technique in which a solution of a tin salt and a solution a silver salt are mixed in the presence of an inorganic or organic acid, alumina, an anionic surfactant, ... | 08/29/2000 |
| 5985221 | Method of recovering precious metals The invention relates to a method of recovering precious metals from oxidic or refractory or semi-refractory ore material containing precious metal. This recovery of precious metal takes place with optimal comminution work and with more efficient and more... | 11/16/1999 |
| 5929001 | Engineered flux-pinning centers in BSCCO TBCCO and YBCO superconductors A method of preparing a high temperature superconductor. A method of preparing a superconductor includes providing a powdered high temperature superconductor and a nanophase material. These components are combined to form a solid compacted mass with the m... | 07/27/1999 |
| 5536480 | Method for treating mineral material having organic carbon to facilitate recovery of gold and silver Provided is a process for treating refractory precious metal-containing ores, particularly gold-bearing ores, which are refractory due to the presence of organic carbon, to reduce the ability of organic carbon to interfere with recovery of the precious me... | 07/16/1996 |
| 5425800 | Recovery of precious metal values from refractory ores A hydrometallurgical process is described for recovery of precious metals from ores refractory to treatment by lixiviating agents by crushing the ore to no finer than a nominal 1/4 inch size, treating the ore with about 100% to about 300% of the stoichiom... | 06/20/1995 |
| 5254320 | Method for roasting sulphide ores A method for roasting sulphide ores or ore concentrates containing precious metals is practiced in a furnace, typically in a fluidized bed. The ore and a sulphur-binding lime-containing material are supplied to a roasting furnace in which the ore is roast... | 10/19/1993 |
| 5250273 | Hydrometallurgical leaching process and apparatus A process and apparatus for leaching metal values from a particulate mineral ore containing metal values employs a fluidized bed of the particles; a leaching agent solution containing dissolved oxygen flows upwardly of the bed in a lower leaching zone, to... | 10/05/1993 |
| 5196178 | Method of producing dustfree silver nitrate In order to produce dustfree silver nitrate which can be readily dosed, silver nitrate is atomized in a molten state. A purity of the silver nitrate of greater than 99%, a pH of 2 to 6, and the exclusion of light during the atomizing are necessary.... | 03/23/1993 |
| 5147618 | Process for recovery of gold from refractory gold ores using sulfurous acid as the leaching agent A process for recovering gold from refractory gold-bearing ores uses sulfurous acid as the leaching agent to form a gold-sulfite complex. The ore is ground, slurried blended with a chelating agent and then subjected to a simultaneous dissolved SO2 | 09/15/1992 |
| 5147617 | Process for recovery of gold from gold ores using a complexing pretreatment and sulfurous acid leaching A process for recovering gold from gold-bearing ores includes the steps of forming a slurry of ground ore and treating the ore with an oxidizing and complexing agent such as hydrogen sulfide or a sulfide salt. A chelating agent, SO2, air, and a... | 09/15/1992 |
| 5096678 | Method and apparatus for beneficiating ores A method and apparatus for treating mineral-bearing ores and, more particularly, for treating ores containing precious metals, base metals and the like values by providing a means to extract the metal or other values from a particulated ore by classifying... | 03/17/1992 |
| 4571387 | Biological-acid leach process A process for leaching copper from copper sulphide containing ore, in particular copper from chalcopyrite containing ore, is provided. The ore is preferably initially ground up and mixed with an aqueous acid leaching medium containing sulphide oxidizing b... | 02/18/1986 |
| 4483827 | Hydrometallurgical process for the recovery of valuable metals from sulfidic, silicate-containing raw materials The invention relates to a process for the recovery of valuable metals from sulfidic, silicate-containing raw materials by slurrying the raw material in water, by subjecting the slurry to a selective leach under atmospheric conditions and in an acidic mil... | 11/20/1984 |
| 4423011 | Selective recovery of base metals and precious metals from ores Metal values are recovered from ore concentrates by forming a sulfide matte, grinding the matte, leaching with sulfuric acid at elevated temperature to selectively extract nickel and iron, and leaching the residue with an acidic aqueous ferric or cupric s... | 12/27/1983 |
| 4337226 | Recovery of platinum-group metals from ores Metal values are recovered from ore concentrates by means of dry grinding, followed by a two-stage leaching process in which the ground concentrate is first leached with sulfuric acid at a temperature of about 90° to 100° C. to selectively leach nickel ... | 06/29/1982 |
| 4269676 | Method of winning copper and accompanying metals from sulfidic ores, post-flotation deposits and waste products in the pyrometallurgical processing of copper ores The invention relates to a method of winning copper and accompanying metals from sulfidic ores, post-flotation deposits and waste products in the pyrometallurgical processing of copper ores. In accordance with the present invention, transferring of insoluble ... | 05/26/1981 |
| 4192851 | Leaching of metal sulphides The process of the invention is for the separate recovery of elemental sulfur and residual sulfides and metal salt solution from reaction slurries obtained from leaching of metal sulfides in ores and concentrates. The process comprises directing flow of a... | 03/11/1980 |
| 4177068 | Extraction of gold and silver A process for the extraction of gold and silver from their ores in which the ore is reduced to a particle size of 1 mm or less and mixed with a lixiviant, e.g., alkaline sodium or potassium cyanide, in an amount to provide a liquor content of about 8 to 1... | 12/04/1979 |
| 3949051 | Hydrometallurgical process for extracting copper from chalcopyrite or bornite concentrates A process for extracting copper from a copper-containing concentrate by comminuting the concentrate in the presence of a liquid dispersing agent which inhibits agglomeration and forms a pulp, and leaching the pulp in the presence of a silver catalyst.... | 04/06/1976 |
