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| Number | Title | Issue Date |
| 8152896 | Separation of fine particle precious metals from clays and other gangue materials through application of diluted solution of a silicon chemical The present invention generally relates to a formulation created by reacting sodium hydroxide, water, and silicon metal which has unique properties and many uses. The present invention further relates to the separation of fine particle gold and other precious metals... | 04/10/2012 |
| 8070850 | Process for liberating metals using direct production of leach grade acid solutions A system which uses available waste acid process streams from hydrometallurgical extraction processes as absorption media for the direct production of leach grade acid solutions for return to the hydrometallurgical processing circuit for use in liberating metals fro... | 12/06/2011 |
| 7922788 | Process for recovering gold and silver from refractory ores The present invention is directed to flotation of refractory gold sulfide ores in which the ore is ground, floated, the tailings reground, and refloated to produce gold-bearing concentrates. ... | 04/12/2011 |
| 7871454 | Chemical process for recovery of metals contained in industrial steelworks waste This invention provides chemical processes for the treatment of industrial steelworks waste, especially those from an electric arc furnace, called “flue dust,” to allow for the subsequent recovery of metals (e.g. zinc and iron) from the dust. The main purposes o... | 01/18/2011 |
| 7686866 | Recovery of copper from chalcopyrite A process for recovering copper from chalcopyrite is disclosed. The process includes oxidising sulphur in chalcopyrite with a solution under predetermined contact conditions and thereby releasing at least part of the copper in the chalcopyrite into the solution as c... | 03/30/2010 |
| 7559970 | Method for producing metal nanoparticles and metal nanoparticles produced thereby The present invention relates to a method for producing metal nanoparticles and metal nanoparticles produced thereby, in particular, to a method for producing metal nanoparticles used for inkjet that comprises, preparing metal nanoparticles capped with a fatty acid;... | 07/14/2009 |
| 7318914 | Chromium removal from leach liquors produced during high pressure acid leaching of lateritic ores A method is provided for the removal of chromium from leach liquors produced during high pressure leaching of laterite ores in an autoclave, by addition to the autoclave of carbon in a quantity of about 0.5%-1% by weight with reference to the total dry feed. ... | 01/15/2008 |
| 7303916 | Sustained totipotent culture of selected monocot genera A method is provided for generating sustained totipotent tissue cultures of a plant of the Class Monocotyledonae, and for micropropagating such plant in vitro, wherein immature inflorescence are cultivated to produce totipotent tissue which is suitable for sustained... | 12/04/2007 |
| 7275857 | Apparatus for treating plastics material A device for treating plastics material, in particular thermoplastic plastics material, has a receiving container (1) which has a base (15) and lateral walls (14). In the receiving container at least [one] disc (17) is arranged close to t... | 10/02/2007 |
| 7268273 | Recovering metals from soil The invention relates to recovering metals, such as nickel and cobalt, by phytomining or phytoextracting soils rich in metals wherein the desired metal is selectively accumulated in hyperaccumulator plants by adjusting the soil pH. The metals are ultimately recovere... | 09/11/2007 |
| 7247242 | Arsenic removal from water Methods for removing arsenic from water by addition of inexpensive and commonly available magnesium oxide, magnesium hydroxide, calcium oxide, or calcium hydroxide to the water. The hydroxide has a strong chemical affinity for arsenic and rapidly adsorbs arsenic, ev... | 07/24/2007 |
| 7214516 | Bacterial effects on metal accumulation by plants The invention includes methods for (1) extracting metals from soil by the use of plants that extract and accumulate the metal and adding bacteria to the soil that enhances the ability of the plants to extract the metal, and (2) preparing soil for extraction of a met... | 05/08/2007 |
| 7198941 | Porous vessel bioreactor The present invention provides a porous vessel bioreactor apparatus for use in reaction with immobilized enzymes and/or microbial cells, said apparatus consisting of a vertically elongated reaction vessel having at least one liquid reactant inlet; at least one produ... | 04/03/2007 |
| 7169206 | Battery recycling Process for the recovery of Co or Ni, comprising the steps of: preparing a metallurgical charge comprising Fe, slag formers, and a useful load containing either one or both of Co and Ni; feeding the charge to a sha... | 01/30/2007 |
| 7163570 | Chromatographic method of separating ruthenium from platinum group metals A chromatographic separation method separates ruthenium from other platinum group metals in a feed solution, by converting the Ru to a nitrosyl complex, retaining the nitrosyl complex temporarily on the chromatography column and subsequently eluting Ru, for example ... | 01/16/2007 |
| 7078122 | High efficiency process for treating mixed metal waste A process for rendering hazardous materials present in multi-element waste non-hazardous, and for recovering valuable components of said waste, particularly metals, comprising contacting the waste with an aqueous solution of HX, wherein X is halogen, thereby convert... | 07/18/2006 |
| 7069690 | Compositions and methods for removing pollutants from contaminated wafer with a fern plant Processes and materials for phytoremediating water-containing sites which have been contaminated with pollutants such as arsenic, phosphorous, or other metals. Fern plants can be used to accumulate pollutants from contaminated water-containing sites having an aqueou... | 07/04/2006 |
| 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 |
| 7065920 | Contaminant removal by additional ferns Processes, methods, materials and compositions for phytoremediating contaminated waters, which have been contaminated with pollutants such as arsenic. Fern plants that include Pteris and non-Pteris fern plants can be used to accumulate pollutants from ... | 06/27/2006 |
| 7066982 | Contaminant removal by ferns via foliar-application and excised/ground fronds Processes, methods, materials and compositions for phytoremediating contaminated waters, which have been contaminated with pollutants such as arsenic, phosphorous, or other metals. Fern plants can be used to accumulate pollutants from contaminated water, including a... | 06/27/2006 |
| 7049492 | subspecies for cadmium and zinc recovery A cadmium and zinc hyperaccumulating subspecies from Thlaspi caerulescense and methods for removing or recovering cadmium and zinc from soils by cultivating the Thlaspi caerulescense subspecies on soils containing cadmium and zinc. ... | 05/23/2006 |
| 7044995 | Purification of metals from mixtures thereof A process for preparing a pure PGM (platinum group metal) from a material containing a plurality of PGM compounds, wherein the PGM is selected from the group consisting of Pt, Pd, Os, Ir, Ru, Rh and Re, and the process includes initially forming the PGM in activated... | 05/16/2006 |
| 7034202 | Heavy metal phytoremediation The invention provides methods and compositions for heavy metal phytoremediation, including plants which are genetically engineered to overexpress glutamylcysteine synthetase (ECS) and thereby provide enhanced heavy metal accumulation. In various embodiments, the pl... | 04/25/2006 |
| 7018593 | Base metal recovery from a tailings dump by bacterial oxidation A method of recovering base metal from a tailings dump which includes the steps of: aerating a surface layer of the dump; adjusting the pH and the moisture content of the surface layer to provide conditions favourable for bacterial oxidation of sulphide minerals; al... | 03/28/2006 |
| 6997444 | Radial disc impeller apparatus and method A radial disc impeller for use with a liquid or liquid suspension mixing assembly, having an axis of rotation. The radial disc has a hub and at least one disc extending radially away from the axis of rotation. The disc is connected to the hub at first axial location... | 02/14/2006 |
| 6974896 | Trace element phytoremediation The invention provides methods and compositions for trace element, particularly heavy metal phytoremediation, including plants which are genetically engineered to overexpress a sulfate assimilation pathway enzyme gene and thereby provide enhanced trace element accum... | 12/13/2005 |
| 6967098 | Process for changing the appearance of stone, concrete, or hard surfaces by applying microorganisms A preferred method by which microorganisms and nutritive media are sprayed, brushed, dripped, or otherwise applied, onto freshly cut rock, stone, freshly formed concrete, or other hard manmade surface, in order for the target surface to take on a weathered appearanc... | 11/22/2005 |
| 6958435 | Methods for accumulating selenium in edible brassica A method of producing edible Brassica plants capable of accumulating significant concentrations of selenium in edible portions of the plant. Edible Brassica plants were grown in an environment containing selenium, the plants were cultivated under condi... | 10/25/2005 |
| 6953120 | Method of recovering metal and/or oxide thereof in a slurry and tailings obtained from said method A method of recovering metal and/or oxide thereof from a slurry is described. The method involves magnetically separating at least a portion of any magnetic impurities from the slurry and then leaching or dissolving at least a portion of any remaining magnetic impur... | 10/11/2005 |
| 6949232 | Producing cobalt (III) hexammine sulfate from nickel cobalt sulfides There is provided an improvement in a process for producing cobalt (III) hexammine sulphate which process comprises oxidatively pressure leaching nickel cobalt sulphides in an ammoniacal ammonium sulphate solution. The nickel and cobalt sulphides are oxidized to sul... | 09/27/2005 |
| 6936090 | Process for isolating rhenium A process for elution of rhenium adsorbed on strongly basic ion-exchange resins by means of highly concentrated aqueous hydrochloric acid solution is described, in which the ion-exchange resin is treated with aqueous solution containing an oxidizing agent. ... | 08/30/2005 |
| 6932855 | Method for recycling metals from swarf A method for recycling metals from swarf includes steps of removing oil in swarf by means of surfactant having a feature of strong hydrophilicity. The steps involves repeated stirring and washing, separating solid from liquid, and separating oil from water so as to ... | 08/23/2005 |
| 6905531 | Process for the dissolution of copper metal Process for producing a copper-containing aqueous solution, in which a copper mass is dissolved in the presence of an oxidant in an aqueous leach liquor containing monoethanolamine and (HMEA)2CO3. The leach liquor is produced by partially carbo... | 06/14/2005 |
| 6905532 | Process for the dissolution of copper metal Process for producing a copper-containing aqueous solution, in which a copper mass is dissolved in the presence of an oxidant in an aqueous leach liquor containing monoethanolamine and (HMEA)2CO3. The leach liquor is produced by partially carbo... | 06/14/2005 |
| 6846346 | Sulfatization process for metal extraction from sulfide ores The invention provides a hydrometallurgical process for treating metal-containing sulfide ores and concentrates, comprising reacting said metal-containing sulfide with concentrated sulfuric acid at a temperature of between about 300° C. and 400° C. in the presence... | 01/25/2005 |
| 6786948 | Method for phytomining of nickel, cobalt and other metals from soil The recovery of nickel, cobalt and other metals by phytomining is described. Plants of the Alyssum genus are grown in nickel rich soil. The uptake of nickel is enhanced by maintaining specific soil conditions, including a concentration of calcium between (but not in... | 09/07/2004 |
| 6702872 | Processes for the recovery of copper from aqueous solutions containing nitrate ions A process for the recovery of copper from a copper-containing aqueous acid leach solution containing nitrate ions, in which the leach solution is contacted with a solution of an oxime extractant in a water-immiscible organic solvent, which comprises utili... | 03/09/2004 |
| 6656722 | Process for immobilizing arsenic waste The invention provides a process for removing and immobilizing arsenic from an arsenic-containing waste. It comprises oxidizing the arsenic to pentavalent arsenic in an aqueous medium, contacting the pentavalent arsenic with trivalent iron to form an inso... | 12/02/2003 |
| 6375909 | Method for the removal of mercury and nitrogen oxides from combustion flue gas The process is by injection of calcium chloride into the combustor and lowering the flue gas temperature in sufficient time to enhance oxidation of mercury and nitrogen oxides into more soluble products prior to their absorption in a wet scrubber. The add... | 04/23/2002 |
| 6324785 | Process for harvesting organic compounds from plant roots Organic compounds are recovered from the roots of living plants by treating said roots by an extraction with enzymes. The plant is removed from its growing medium, subjected to the extraction and then returned to its original growing medium. The process i... | 12/04/2001 |
