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| Number | Title | Issue Date |
| 8114365 | Silica removal from pregnant leach solutions The present invention relates generally to a process for removing dissolved or colloidal silica from a pregnant leach solution (“PLS”). More particularly, an exemplary embodiment of the present invention relates to a process which mixes PLS with an acid source, ... | 02/14/2012 |
| 7691347 | Silica removal from pregnant leach solutions The present invention relates generally to a process for removing dissolved or colloidal silica from a pregnant leach solution (“PLS”). More particularly, an exemplary embodiment of the present invention relates to a process which mixes PLS with an acid source, ... | 04/06/2010 |
| 7297315 | Method of recovering a cleaning agent The invention provides a method of recovering a copper component or a manganese component from a cleaning agent containing copper oxide, a cleaning agent containing basic copper carbonate, a cleaning agent containing copper hydroxide, or a cleaning agent containing ... | 11/20/2007 |
| 7291292 | Preparation of silver particles using thermomorphic polymers This invention relates to the synthesis and isolation of colloidal silver particles through the use of thermomorphic polymers and the resulting composition. It further relates to the use of the resulting composition in the preparation of inks for printing with silve... | 11/06/2007 |
| 7291274 | Method of deionising and clarifying the aqueous medium used in an electrical discharge machine and the product used in said method Deionisation and clarification process of the aqueous medium used in an electroerosion machine and product for this process, where the electroerosion machines are comprised of a purification circuit for this aqueous medium, which includes an ion exchange phase betwe... | 11/06/2007 |
| 7285256 | Precious metal recovery using thiocyanate lixiviant Precious metal-containing mineral material is subjected to an acidic thiocyanate leach to dissolve the precious metal as a precious metal-thiocyanate complex. A feed of the thiocyanate leach solution may include a large molar ratio of ferric iron to thiocyanate. Pre... | 10/23/2007 |
| 7175819 | Regeneration of cupric etchants and recovery of copper sulfate Spent, acidic solutions comprising cupric chloride and hyrdrochloric acid from the copper etching process are regenerated by a process in which the acid is subjected to distillation with sulfuric acid. In one embodiment, the process comprises (a) providing a spent e... | 02/13/2007 |
| 7160526 | Process for detoxification of CCA-treated wood A chemical process for detoxifying spent CCA (copper, chrome, arsenic)—treated wood, from which CCA and detoxified wood are recovered for recycling comprising the steps of (a) treating CCA-treated wood in the presence of a liquefying reagent such as an organic sol... | 01/09/2007 |
| 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 |
| 6773487 | Process for refining silver bullion with gold separation A process is disclosed for refining silver bullion, i.e. raw silver containing generally more than 90% silver besides Se, Pb, Au, Cu and platinum group metals (PGM) as main impurities. The process comprises: optionally removing Se as gaseous SeO2 f... | 08/10/2004 |
| 6716403 | Method of recovering a cleaning agent The invention provides a method of recovering a copper component or a manganese component from a cleaning agent containing copper oxide, a cleaning agent containing basic copper carbonate, a cleaning agent containing copper hydroxide, or a cleaning agent containing ... | 04/06/2004 |
| 6663689 | Process for direct electrowinning of copper A system and process for recovering copper from a copper-containing ore, concentrate, or other copper-bearing material to produce high quality cathode copper from a leach solution without the use of copper solvent extraction techniques or apparatus. A pro... | 12/16/2003 |
| 6451089 | Process for direct electrowinning of copper A system and process for recovering copper from a copper-containing ore, concentrate, or other copper-bearing material to produce high quality cathode copper from a leach solution without the use of copper solvent extraction techniques or apparatus. A pro... | 09/17/2002 |
| 6337056 | Process for refining noble metals from auriferous mines A process for refining noble metals from auriferous mines, wherein the auriferous material is first milled and treated with a cyanide solution, and comprising: a step for the pretreatment of the auriferous material, wherein the complexes of cyanide with n... | 01/08/2002 |
| 6290749 | Preparation of ultra-pure silver metal A method for preparing ultra-pure silver from a crude silver mixture containing metallic and/or non-metallic impurities, said method comprising; dissolving the crude silver mixture in nitric acid to form a crude silver nitrate solution; adding a first sel... | 09/18/2001 |
| 6290747 | Conversion of impure silver halide to ultra-pure silver metal A method for preparing ultra-pure silver from a crude silver halide matrix containing metallic and/or non-metallic impurities, said method comprising; roasting the crude silver halide matrix to substantially remove carbonaceous material; treating the roas... | 09/18/2001 |
| 6177571 | Method for removing heavy metals from organic compounds A method for removing heavy metals, selected from palladium, tin and nickel, from heavy metal complexes with thiazole compounds in aqueous or alcoholic solution, by precipitation as sulfides, characterised in that such solutions are treated with a water-s... | 01/23/2001 |
| 6129779 | Reclaiming metallic material from an article comprising a non-metallic friable substrate A method for reclaiming a metallic material from a article including a non-metallic friable substrate. The method comprising crushing the article into a plurality of pieces. An acidic solution capable of dissolving the metallic material is provided dissol... | 10/10/2000 |
| 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 |
| 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 |
| 5961879 | Process for the manufacture of hypochlorite bleaching compositions The present invention discloses a process for the manufacture of liquid aqueous bleaching compositions comprising hypochlorite, a strong source of alkalinity and water, said process comprising the steps of: mixing said alkali metal hypochlorite, said stro... | 10/05/1999 |
| 5928559 | Process for the manufacture of hypochlorite bleaching compositions The present invention discloses a process for the manufacture of liquid aqueous bleaching compositions comprising alkali metal hypochlorite, a strong source of alkalinity and water; said process comprising the steps of: mixing alkali metal hypochlorite, s... | 07/27/1999 |
| 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 |
| 5531903 | Fluoride removal from metal sulphate solution and a method of waste utilization A process is provided for the removal of fluoride from a metal sulphate solution, such as a zinc sulphate solution, which presents an option for the disposal of waste treatment sludge from the aluminum anodizing industry. The fluoride is removed from meta... | 07/02/1996 |
| 5520814 | Process for recovering spent metal etching solutions A process comprising spent metal etching solutions, the process comprising the steps of: 1) extracting the metal ions from the spent etching solution by means of a liquid ion exchanger; 2) washing the liquid ion exchanger by means of water; 3) vaporizing ... | 05/28/1996 |
| 5505857 | Process for the treatment of metal-containing water and recovery of metals therefrom Metals contained in various wastewaters are selectively recovered as metal precipitates and/or as spinel ferrite and water suitable for discharge into the environment is obtained. High grade magnetic spinel ferrite is recovered from wastewaters having alu... | 04/09/1996 |
| 5380443 | Method of treating waste water A process of treating water to remove metal ion contaminants contained therein, said metal ion contaminants selected from the group consisting of metals in Groups 8, 1b, 2b, 4a, 5a, or 6a of the periodic table, lanthanide metals, and actinide metals inclu... | 01/10/1995 |
| 5342430 | Passivation of methylchlorosilane fines A process for the passivation of fine particulate matter exiting a reactor train for the manufacture of organohalosilanes comprising treating the particulate matter or fines with an aqueous medium comprising a polyalkylene ether surfactant and optionally ... | 08/30/1994 |
| 5332560 | Process for the removal of zinc and nickel from copper ammine sulfate solutions A method for the recovery of copper from copper-containing materials, for example, scrap, ores or dust. An aqueous cupric tetrammine sulfate lixiviant is contacted with the copper-containing material to produce a leachate containing cuprous, nickel, and z... | 07/26/1994 |
| 5328669 | Extraction of precious metals from ores and other precious metal containing materials using halogen salts Platinum group metals, gold and silver are extracted from complex ores, automobile scrap, refractory ores and as naturally occurring by leaching the precious metal containing materials with a solution containing halogen salts such as potassium or sodium i... | 07/12/1994 |
| 5271909 | Method of tellurium separation from copper electrorefining slime A method of increasing the extraction of tellurium from copper electrorefining slime comprises leaching the slime with dilute sulphuric acid in a reactor under a partial oxygen pressure of up to 150 psi and at an elevated temperature between about 100° a... | 12/21/1993 |
| 5263044 | Remelting method for recognition and recovery of noble metals and rare metals Method for recognition of noble metals otherwise not recognizable in base material clusters includes using an electron beam furnace in which base material clusters are vaporized by means of an electron beam gun, and the vaporized materials are condensed a... | 11/16/1993 |
| 5234669 | Recovery of non-ferrous metals from smelter flue dusts and sludges Methods are disclosed for treating smelter flue dust and other smelter by-products so as to recover non-ferrous metals therefrom and convert arsenic and sulfur in the flue dust into non-leachable compounds. The methods allow the flue dust and other smelte... | 08/10/1993 |
| 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 |
| 5173276 | Method for recovery of copper from copper-containing materials A process for precipitating solid hydrates of cupric tetrammine sulfate from a solution, wherein the solution contains at least 40 grams per liter of free ammonia, at least 50 grams per liter of ammonium sulfate and wherein the temperature of the solution... | 12/22/1992 |
| 5139752 | Method for extraction of gold and silver from ore with a solution containing a halogen, halogenated salt and organic solvent From an ore containing gold and silver, the gold and silver are extracted by a method which comprises pulverizing the ore and bringing the pulverized ore into contact with an elemental halogen, a halogenated salt, and an organic solvent thereby converting... | 08/18/1992 |
| 5137700 | Processes employing iodine-iodide etching solutions Aqueous iodine-iodide etching solutions are employed in the recovery of precious metals. Elemental iodine is precipitated from spent etching solutions and used to supply both the iodine and iodide of new etching solutions. Prior to extraction of the eleme... | 08/11/1992 |
| 5133948 | Process for the removal of bismuth from copper refining electrolyte by using lead oxide Bismuth impurity is removed from copper electrolyte by contacting the electrolyte with an effective amount of finely divided lead oxide.... | 07/28/1992 |
| 5126116 | Method for forming copper arsenate The invention provides a method of forming copper arsenate. Copper and arsenic are leached into a treatment solution maintained at a pH level of about 2 to 5 in the presence of at least one impurity. An oxidant is added to the treatment solution to oxidiz... | 06/30/1992 |
| 5114687 | Ammonia extraction of gold and silver from ores and other materials Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia, ammonium salts and one or more oxidants. The process is particularly effective for refractory gold ores including... | 05/19/1992 |
