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| Number | Title | Issue Date |
| 7326329 | Commercial production of hydrogen from water Large quantities of low cost hydrogen free of carbon oxides are required as fuel for the hydrogen economy. Commercial quantities of hydrogen can be produced from the electrolysis of water using a diaphragm-less electrolytic cell. The electrolytic cell has an anode c... | 02/05/2008 |
| 7182851 | Electrolytic commercial production of hydrogen from hydrocarbon compounds This invention concerns the commercial production of electrolytic hydrogen from coal and other hydrocarbon compounds. The process provides high capacity and low impedance compared to conventional diaphragm electrolytic cells. The hydrogen produced is suitable for co... | 02/27/2007 |
| 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 |
| 5882502 | Electrochemical system and method An electrochemical apparatus and system for extracting and recovering metals from their compounds using electrochemical cells where the anolyte 10 is connected electrically to the catholyte 11 through an independent set of electrodes 13, 14 immersed in ea... | 03/16/1999 |
| 5876588 | Process for removing and recovering copper, silver and zinc from sulfide ores Ores containing copper, zinc, silver in the form of sulfides are treated by a solution of sulfurated sulfite ions and ammonium ions in order to remove most of the metals from the sulfide ores. This treatment renders the resulting gold bearing ores much mo... | 03/02/1999 |
| 5620585 | Inorganic perbromide compositions and methods of use thereof A process for leaching gold, silver, platinum and palladium wherein an aqueous leaching solution containing bromine and bromide ion contacts a precious metal source to produce an aqueous leachate. A precursor composition for producing an aqueous leaching ... | 04/15/1997 |
| 5133843 | Method for the recovery of metals from the membrane of electrochemical cells A method for rejuvenating a membrane or diaphragm from an electrochemical cell which comprises the steps of treating the membrane or disphragm with an inorganic acid at an elevated temperature so as to dissolve metallic particles and then optionally treat... | 07/28/1992 |
| 4997532 | Process for extracting noble metals The invention provides a hydrometallurgical process for extracting noble metals from raw materials containing the same, comprising (a) leaching the raw materials with a mineral acid to leave a residue containing the noble metals, (b) treating said residue with... | 03/05/1991 |
| 4919772 | Electrolytic cell/process for the reduction of titanium/iron solutions An electrolytic cell for the reduction of solutions containing both titanium and iron ions, e.g., solutions emanating from the sulfuric acidulation of ilmenite, has a cationic exchange membrane separating the anode and cathode compartments thereof; the so... | 04/24/1990 |
| 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 |
| 4828661 | Process for recovery of metals from metal/plastic waste The invention relates to a process for recovery of metals from metal/plastic waste using used etching and washing solutions from the electronics industry, with the following process steps: (a) heating of the metal/plastic waste in a heating bath in order to ... | 05/09/1989 |
| 4744825 | Removal and recovery of silver from waste stream In accordance with the invention, an improved process is provided for the efficient removal and recovery of silver from an impure solution containing silver ions which comprises contacting the silver-containing solution with an activated alumina adsorbent... | 05/17/1988 |
| 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 |
| 4599153 | Selective extraction of rhenium from aqueous sulfuric acid solutions The present invention relates to the selective extraction of rhenium metal from aqueous sulfuric acid solutions. More particularly, it relates to the selective extraction of rhenium metal from sulfuric acid leach solutions, resulting from the leaching of ... | 07/08/1986 |
| 4571264 | Recovery of gold from refractory auriferous iron-containing sulphidic ore A process for recovering gold from refractory auriferous iron-containing sulphidic ore which comprises feeding ground ore as an aqueous slurry to an acidic pretreatment step. The ground ore in the acidic pretreatment step is treated with aqueous sulphuric... | 02/18/1986 |
| 4571263 | Recovery of gold from refractory auriferous iron-containing sulphidic concentrates A process for recovering gold from refractory auriferous iron-containing concentrate includes feeding the concentrate as an aqueous slurry to an acidic pretreatment step and treating the concentrate in the acidic pretreatment step with aqueous sulphuric a... | 02/18/1986 |
| 4543169 | Gold recovery process A method is described for precious metal recovery from acidic precious metal-cyanide solutions by means of a weakly-basic anion-exchange material comprising a polymeric felt incorporating radiation-grafted pyridinyl functional groups.... | 09/24/1985 |
| 4443305 | Emulsion electrowinning A process of electrodepositing a metal from an organic phase containing a salt or complex of that metal includes the steps of creating a dispersion of the organic phase in a conducting aqueous electrolyte with which it is immiscible and electrodepositing ... | 04/17/1984 |
| 4374713 | Process for separating tungsten from coinage metals A process for cleanly separating tungsten and the coinage metals from alloys or mixtures thereof comprises electrowinning the coinage metal from an electrolyte solution which is maintained substantially free of tungsten contamination by contacting the ele... | 02/22/1983 |
| 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 |
| 4273631 | Process for the continuous recovery of gold and other metals from sea water A quantity of Gilsonite Asphalt in proportion ranging from one-tenth gram to three grams per gallon of water to be treated is added in finely powdered form to sea water to coagulate plankton containing metals in the water in a coated treating tank. Treate... | 06/16/1981 |
| 4173519 | Method, process, system, and apparatus for recovering metal values from ores A method, process, system, and apparatus for recovering metal values such as gold and silver from ores. The process contemplates the prior separation, through appropriate apparatus, of primary slimes from the coarse fraction of ores and each fraction is p... | 11/06/1979 |
| 4002544 | Hydrometallurgical process for the recovery of valuable components from the anode slime produced in the electrolytical refining of copper A hydrometallurgical process for the recovery of silver, selenium and tellurium from the anode slime produced in the electrolytic refining of copper or lead or from other raw materials bearing these metals, wherein the raw material and concentrated sulfur... | 01/11/1977 |
