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| Number | Title | Issue Date |
| 7294168 | Method for purifying the solution in the hydrometallurgical processing of copper The invention relates to the removal of bivalent copper from copper chloride solution in connection with the hydrometallurgical production of copper. In the copper production process, a copper-bearing raw material is leached with a chloride-bearing solution. The cop... | 11/13/2007 |
| 7214256 | Solvent extraction process A circuit configuration for a metal solvent extraction plant comprising: A) an extraction section for extracting metal ions from an aqueous leach solution containing the metal ions with an organic solvent solution containing at lea... | 05/08/2007 |
| 6910580 | Portable condiment caddy A portable soft-sided pocketed case or condiment caddy constructed particularly for containing, organizing, and transporting packets of food condiments, and other basic items such as napkins, straws and eating utensils, provides convenience and handy availability. T... | 06/28/2005 |
| 6680034 | Method for recovering metal values from metal-containing materials using high temperature pressure leaching The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials through pressure leaching operations. In accordance with the various aspects of the present invention, metal-containing pregn... | 01/20/2004 |
| 6599414 | Solvent extraction processes for metal recovery An improvement in the solvent extraction process for recovering metal values, i.e. copper, from acidic aqueous solutions containing copper and iron which may also include chloride, and more particularly to an improvement which provides for increased coppe... | 07/29/2003 |
| 6537440 | Processing copper sulphide ores A method for extracting copper from a mineral feed containing copper sulphide mineral 1, which involves crushing and blending the feed 2, 6, 10 followed by leaching of the feed in an autoclave 20. The conditions in the autoclave are controlled so that the... | 03/25/2003 |
| 6521117 | Method for metal recovery from aqueous solutions The present invention is directed to an improved process for the recovery of metal ions from metal-containing aqueous solutions using a supported liquid membrane (SLM) whereby the pH of the metal-containing solution is preferably adjusted to between 5.5 a... | 02/18/2003 |
| 6375713 | Use of cupric chloride etchant solution in a solvent extraction electrowinning copper refinery Process for improving recovery of copper and reducing raw material costs, from a copper-containing source by SX-EW. The process comprises the steps of mixing an acidic copper-containing PLS obtained by leaching a copper-containing source with an acidic le... | 04/23/2002 |
| 6294071 | Methods of forming copper solutions Methods of dissolving copper into electrolytic solutions, such as solutions comprising nitrogen compounds, by supplying an anodic current to a copper or copper-containing metal that is in contact with an electrolytic solution comprising a nitrogen compoun... | 09/25/2001 |
| 6258245 | Copper leach process aids A method for enhancing the operation of an acid solvent extraction and electrowinning operation by inhibiting acidic aerosol formation, allowing increased acid concentration and allowing higher operating temperature is disclosed wherein an antifoam formul... | 07/10/2001 |
| 6210647 | Process of recovery of metals from aqueous ammoniacal solutions employing an ammonia antagonist having only hydrogen bond acceptor properties An improved process for the extraction of a metal from an aqueous ammoniacal solution comprising: (i) contacting the aqueous ammoniacal solution with an extraction reagent comprised of a water insoluble extractant for the metal, to provide an organic phas... | 04/03/2001 |
| 6179988 | Process for making copper wire This invention relates to a process for making wire, comprising: (A) forming a circular disk of electrodeposited copper, (B) rotating said disk about its center axis; (C) feeding a cutting tool into the peripheral edge of said disk to cause a strip of cop... | 01/30/2001 |
| 6165344 | Method for removing copper ions from copper ore using organic extractants A method for removing solid wastes from an organic extractant-based SX/EW copper processing system. A lixivant is initially applied to copper ore, followed by mixing of the copper-containing lixivant product with an organic extractant. The organic extract... | 12/26/2000 |
| 6156186 | Method for removing contaminants from process streams in metal recovery processes The present invention is directed to a process for removing various contaminants (e.g., organic collectors, contaminant metals or spectator ions, and/or suspended and colloidal solids) from process streams in leaching processes. The contaminant removal is... | 12/05/2000 |
| 5993635 | Atmospheric mineral leaching process A method is provided for processing a sulphide mineral composition which at least partly comprises an iron-containing mineral. The method includes the steps of: (a) milling said composition to a particle size P80 of 20 microns or less; (b) leaching said c... | 11/30/1999 |
| 5849172 | Copper solvent extraction and electrowinning process An improved method and apparatus is provided for the production of copper using a solvent extraction electrowinning process. Process streams formed during the process containing entrained liquids are fed to a cyclone to remove either organic extractant or... | 12/15/1998 |
| 5837123 | Prevention of cathode corrosion during electrowinning A method to prevent corrosion of a stainless steel cathode in a copper electrowinning system uses compounds added to the electrowinning solution which reduce the level of free chlorine. Examples of such compounds are thiourea, alkyl sulphonate surfactants... | 11/17/1998 |
| 5733431 | Method for removing copper ions from copper ore using organic extractions A method for removing solid wastes from an organic extractant-based SX/EW copper processing system. A lixivant is initially applied to copper ore, followed by mixing of the copper-containing lixivant product with an organic extractant. The organic extract... | 03/31/1998 |
| 5670033 | Process for making copper metal powder, copper oxides and copper foil This invention is directed to a process for making copper metal powder from copper-bearing material, comprising: (A) contacting said copper-bearing material with an effective mount of at least one aqueous leaching solution to dissolve copper ions in said ... | 09/23/1997 |
| 5670035 | Method for recovering copper An improved process is described for the recovery of copper from an aqueous feed solution using solvent extraction and electrowinning in which the electrowinning is conducted in a first step wherein the electrolyte is flowing perpendicular to the cathode ... | 09/23/1997 |
| 5632963 | Process for the removal of impurity elements from solutions of valuable metals A process is disclosed for removing impurity elements, such as arsenic, and if necessary antimony, iron or bismuth, from valuable metal containing, such as copper containing, strongly mineral acid solutions by way of solvent extraction with organic soluti... | 05/27/1997 |
| 5516408 | Process for making copper wire This invention relates to a process for making copper wire directly from a copper-bearing material, comprising: (A) contacting said copper-beating material with an effective amount of at least one aqueous leaching solution to dissolve copper ions into sai... | 05/14/1996 |
| 5468353 | Mist suppressant for solvent extraction metal electrowinning The formation of acid mist or spray over metal electrowinning tanks, such as in the electrowinning of copper obtained by solvent extraction, is substantially inhibited or eliminated by electrowinning the metal from electrolyte containing certain fluoroali... | 11/21/1995 |
| 5458746 | Process for making copper metal powder, copper oxides and copper foil This invention is directed to a process for making copper metal powder from copper-bearing material, comprising: (A) contacting said copper-bearing material with an effective amount of at least one aqueous leaching solution to dissolve copper ions in said... | 10/17/1995 |
| 5366599 | Method of selective recovery of ferrous and nonferrous metals from industrial wastes and scrap home electric appliances After optional preliminary treatment, solid wastes are processed in accordance with the flowsheet FIG. 1: first, Cu is leached selectively with a leaching solution containing Cu(II) ammine as a leachant according to the autooxidation or the autocatalytic ... | 11/22/1994 |
| 5282938 | Process for recovery of trace metals and salts from waste combustion residues A method for the continuous treatment of air pollution control residues from various resource recovery systems whereby the air pollution control residue is treated with a dilute salt extracting solution at a pH chosen to maximize the recovery of lead, for... | 02/01/1994 |
| 5262019 | Decontamination of radioactive metals Technetium-contaminated nickel is decontaminated by electrolytically dissolving nickel having a gross beta activity of at least about 74 Bq in a sulfuric acid solution having a pH between about 0.5 and 2.0. The applied voltage is from 2.0 v/cell to 5.0 v/... | 11/16/1993 |
| 5217585 | Transition metal decontamination process Nickel (or other transition metal) contaminated with about 5 ppm technetium is decontaminated by dissolving the nickel and the technetium into an aqueous acid solution while introducing a graphite or activated carbon powder into the acid to immediately ad... | 06/08/1993 |
| 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 |
| 5196095 | Process for recovering a metal from an aqueous solution comprising a mixture of metal chlorides A process for recovery of metal values from a mixed metal chloride containing leach solution by contacting the leach solution with a water immiscible solution of a complexing agent selective for the neutral chloride of the metal to be recovered and a chel... | 03/23/1993 |
| 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 |
| 4971662 | Hydrometallurgical recovery of metal values from cooper containing sulphide materials A process for the hydrometallurgical recovery of metal value, particularly copper, from copper-containing sulphide materials in which the material is conventionally ground and reacted with a solution containing less than 3 moles per liter of chloride ion,... | 11/20/1990 |
| 4957714 | Solvent extraction process An improvement is disclosed in the solvent extraction process for recovering metal values, i.e. copper, from aqueous solutions, particularly aqueous solutions, containing copper and iron which may also include chloride, and more particularly to an improve... | 09/18/1990 |
| 4923686 | Process for the extraction of metal values Metal values are extracted from aqueous solutions of metal salts containing halide or pseudo halide ions by pyridine derivatives containing the substituent --(COX)A where X is the group --OR1 or --NH2 R3 and n i... | 05/08/1990 |
| 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 |
| 4728402 | Electrolytic silver refining process An electrolytic silver refining process in which crude silver is anodically dissolved and refined silver is cathodically deposited and at the same time accompanying metals are selectively extracted from the spent electrolyte and separately cathodically de... | 03/01/1988 |
| 4670115 | Electrolytic silver refining process and apparatus In an electrolytic silver refining process, crude silver is anodically dissolved while refined silver is cathodically deposited and at the accompanying (impurity) metals are selectively extracted from the used (spent) electrolyte and transferred to an aqu... | 06/02/1987 |
| 4594132 | Chloride hydrometallurgical process for production of copper A process for extractive metallurgy of metal sulfides, in particular copper sulfide ores, in which a metal sulfide mineral feed material is cocurrently oxidized in an aqueous cupric chloride solution in the presence of an oxidant to form a slurry containi... | 06/10/1986 |
| 4578162 | Method for dissolving copper in the presence of iron The invention is a method for dissolving copper in the presence of iron comprising: (a) contacting the copper with an oxidant solution; (b) dissolving at least a portion of the copper into the solution; (c) controlling the copper ion concentration in the solution b... | 03/25/1986 |
| 4563256 | Solvent extraction process for recovery of zinc A process for recovery of zinc values from aqueous ammoniacal solutions employing certain alkylsalicylaldoximes or acetophenoximes as the extractant. The method also provides a means for separation of the zinc and copper values present in the aqueous ammo... | 01/07/1986 |
