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| Number | Title | Issue Date |
| 8182773 | Process for separating a chemical element from uranium (VI) starting from a nitric aqueous phase, in an extraction cycle for the uranium A chemical element to be very efficiently separated from uranium starting from an acid aqueous phase, in an extraction cycle for the uranium, when this chemical element is present in said phase at a concentration less than that of the uranium, or even as a trace ele... | 05/22/2012 |
| 8158088 | Extractant compositions for co-extracting cesium and strontium, a method of separating cesium and strontium from an aqueous feed, and calixarene compounds A mixed extractant solvent that includes at least one dialkyloxycalix[4]arenebenzocrown-6 compound, 4′,4′,(5′)-di-(t-butyldicyclohexano)-18-crown-6, at least one modifier, and, optionally, a diluent. The dialkyloxycalix[4]arenebenzocrown-6 compound is 1,3-alte... | 04/17/2012 |
| 7887767 | Process for reprocessing a spent nuclear fuel and of preparing a mixed uranium-plutonium oxide The invention relates to a process for reprocessing a spent nuclear fuel and for preparing a mixed uranium-plutonium oxide, which process comprises: a) the separation of the uranium and plutonium from the fission products, the amer... | 02/15/2011 |
| 7799293 | Actinide extraction methods Methods of separating actinides from lanthanides are disclosed. A regio-specific/stereo-specific dithiophosphinic acid having organic moieties is provided in an organic solvent that is then contacted with an acidic medium containing an actinide and a lanthanide. The... | 09/21/2010 |
| 7666370 | Sodium salt recycling process for use in wet reprocessing process of spent nuclear fuel The present disclosure relates to a process for recycling a sodium salt by decomposition of a sodium nitride liquid waste, comprising a neutralization step in which a nitric acid liquid waste or an off-gas having nitric acid dissolved therein which is produced throu... | 02/23/2010 |
| 7622090 | Method for separating uranium (VI) from actinides(IV) and/or actinides (VI) and its uses The invention relates to a method for separating uranium(VI) from one or more actinides selected from actinides(IV) and actinides(VI) other than uranium(VI), characterized in that it comprises the following steps: a) bringing an organic phase, which is immisc... | 11/24/2009 |
| 7524469 | Extractant composition including crown ether and calixarene extractants An extractant composition comprising a mixed extractant solvent consisting of calix[4] arene-bis-(tert-octylbenzo)-crown-6 (“BOBCalixC6”), 4′,4′,(5′)-di-(t-butyldicyclo-hexano)-18-crown-6 (“DtBu18C6”), and at least one modifier dissolved in a diluent. ... | 04/28/2009 |
| 7494630 | Method of stripping metals from organic solvents A new method to strip metals from organic solvents in a manner that allows for the recycle of the stripping agent. The method utilizes carbonate solutions of organic amines with complexants, in low concentrations, to strip metals from organic solvents. The method al... | 02/24/2009 |
| 7445760 | Method of reprocessing spent nuclear fuel Most part of an amount of uranium contained in the spent nuclear fuel is removed by making fluorine or a fluorochemical act on the spent nuclear fuel to convert the uranium into UF6, and the uranium is purified through a simple method of distilling the UF... | 11/04/2008 |
| 7282187 | Recovery of metal values A process for selectively extracting metal values, including, uranium, thorium, scandium and zirconium, from starting materials which include the metal values. The process is particularly well suited to extracting metal and recovering metal values from tantalum/niob... | 10/16/2007 |
| 7214538 | Device and method for the determination of lithium ion concentration in a biological fluid The present invention relates to a novel device and method for the detection of lithium ions in a biological fluid. In a preferred embodiment, the present invention provides a novel compound and a optical sensor which incorporates said compound for the detection of ... | 05/08/2007 |
| 7157061 | Process for radioisotope recovery and system for implementing same A method of recovering daughter isotopes from a radioisotope mixture. The method comprises providing a radioisotope mixture solution comprising at least one parent isotope. The at least one parent isotope is extracted into an organic phase, which comprises an extrac... | 01/02/2007 |
| 7157003 | Cyclic method for separating chemical elements present in an aqueous solution The invention concerns a cyclic method for separating at least one chemical element E1 from at least one chemical element E2 from an aqueous solution containing said elements, which employs a mixture of two extractants operating in non-overlapping chem... | 01/02/2007 |
| 7081194 | Method for treating ETA-containing wastewater ETA-containing wastewater discarded from a regenerator of a nuclear power plant with a pressurized water reactor is neutralized with sodium hydroxide to adjust the pH value, metals are precipitated and separated, the wastewater is thereafter supplied to a filtration... | 07/25/2006 |
| 7063792 | Method for separating metals such as zirconium and hafnium A method for separating a metal (a) from a metal (2), preferably zirconium from hafnium, which consists in dissolving said metals in an aqueous solution wherein said metals are in a state preventing them from passing through a nanofiltration membrane; treating the a... | 06/20/2006 |
| 7051053 | Method of lazily replicating files and monitoring log in backup file system A method of performing a real time optimized backup from a first computer storage device to a second or backup computer storage device, is disclosed. The method comprises two different approaches of backing up a first computer file stored on the first computer stora... | 05/23/2006 |
| 7025899 | Concentrated solutions of oxime metal extractants and method of formulating extractant compositions therefrom The preparation of concentrated solutions of oxime metal extractants, such as aldoximes and ketoximes, or mixtures of aldoxime and ketoxime, and the use thereof in formulating or preparing extraction reagent compositions for use in an extractant organic phase in a p... | 04/11/2006 |
| 6998052 | Multicolumn selectivity inversion generator for production of ultrapure radionuclides A multicolumn selectivity inversion generator separation method has been developed in which a desired daughter radionuclide is selectively extracted from a solution of the parent and daughter radionuclides by a primary separation column, stripped, and passed through... | 02/14/2006 |
| 6780384 | Method and system for recovering zirconium values from a hard rock ore containing uranium A method of recovering zirconium values from an ore containing zircon, baddeleyite, and uranium is disclosed. The method includes fusing the ore with soda ash and contacting the resulting fused ore with sulfuric acid, which generates an acid leach liquor that contai... | 08/24/2004 |
| 6623710 | Nuclear fuel reprocessing A spent fuel reprocessing method including the steps of partitioning U and Pu(III) in a solvent by solvent extraction and subsequently polishing the solvent in a neptunium rejection operation for removing Np therefrom. The solvent obtained from the neptun... | 09/23/2003 |
| 6533938 | Polymer enhanced diafiltration: filtration using PGA A method is describe for removing metal ions of interest from aqueous solutions containing low concentrations of the metal ions of interest. The method involves the use of a microbially produced polymer, γ-glutamic acid. The polymer is used in conjunctio... | 03/18/2003 |
| 6379634 | Ionic liquids as solvents A method of dissolving in an ionic liquid a metal in an initial oxidation state below its maximum oxidation state, characterized in that the ionic liquid reacts with the metal and oxidizes it to a higher oxidation state. The initial metal may be in the fo... | 04/30/2002 |
| 6328782 | Combined supported liquid membrane/strip dispersion process for the removal and recovery of radionuclides and metals The present invention provides a novel process for the removal and recovery of radionuclides from waste waters and process streams. The process of the present invention utilizes a combination of a supported liquid membrane (SLM) and a strip dispersion to ... | 12/11/2001 |
| 6270737 | Extraction processes and solvents for recovery of cesium, strontium, rare earth elements, technetium and actinides from liquid radioactive waste Cesium and strontium are extracted from aqueous acidic radioactive waste containing rare earth elements, technetium and actinides, by contacting the waste with a composition of a complex organoboron compound and polyethylene glycol in an organofluorine di... | 08/07/2001 |
| 6258333 | Method for the simultaneous recovery of radionuclides from liquid radioactive wastes using a solvent The present invention relates to solvents, and methods, for selectively extracting and recovering radionuclides, especially cesium and strontium, rare earths and actinides from liquid radioactive wastes. More specifically, the invention relates to extract... | 07/10/2001 |
| 6238566 | Multi-stage solvent extraction of metal value Proposed is an improvement in a multi-stage solvent extraction process of a metal value such as rare earth elements from an acidic feed solution containing the metal value in the form of a water-soluble salt by bringing the aqueous solution into contact w... | 05/29/2001 |
| 6093375 | Nuclear fuel reprocessing A spent fuel reprocessing method includes at least the formation of an aqueous solution and at least one solvent extraction step. Formohydroxarmic acid is used to reduce any Np(VI) to Np(V) and/or to form a complex with Np(IV). As a result, substantially ... | 07/25/2000 |
| 5965025 | Fluid extraction A method of extracting metalloid and metal species from a solid or liquid material by exposing the material to a supercritical fluid solvent containing a chelating agent is described. The chelating agent forms chelates that are soluble in the supercritica... | 10/12/1999 |
| 5966584 | Method of separating trivalent actinides from trivalent lanthanides Trivalent actinides can be separated from trivalent lanthanides in aqueous solutions at H+ concentrations of 2 mol/l to 0.001 mol/liter by extraction with bis(aryl)dithiophosphinic acid and a synergist such as TBP, TOPO and TBPO in an organic ... | 10/12/1999 |
| 5928616 | Method of solvent extraction and apparatus therefor In a solvent extraction method a contactor comprises a forward extraction section comprising sub-sections thereof and a back extraction section comprising sub-sections thereof. To enable higher concentrations of solute to be obtained in the backwash liquo... | 07/27/1999 |
| 5926687 | Crown calix |4| arenes, their preparation process and their use for the selective extraction of cesium and actinides The invention relates to crown calix|4|arenes, their preparation process and their use for the selective extraction of cesium and actinides. These crown calixl4larenes comply with the formula: ##STR1## in which R1 represents a group of for... | 07/20/1999 |
| 5888397 | Process for recovering chaotropic anions from an aqueous solution also containing other ions A solid/liquid process for the separation and recovery of chaotropic anions from an aqueous solution is disclosed. The solid support comprises separation particles having surface-bonded poly(ethylene glycol) groups, whereas the aqueous solution from which... | 03/30/1999 |
| 5881358 | Composition for extracting transition metal and method for extracting transition metal using the same A composition for extracting a transition metal which comprises as an active ingredient a cyclic phenol sulfide represented by the following formula (1): ##STR1## wherein X represents a hydrogen atom, a hydrocarbon group, an acyl group, a carbox... | 03/09/1999 |
| 5863439 | Process for separation and preconcentration of radium from water A process for preconcentrating and separating radium from a contaminated solution containing at least water and radium includes the steps of adding a quantity of a water-soluble macrocyclic polyether to the contaminated solution to form a combined solutio... | 01/26/1999 |
| 5826161 | Process for the selective separation of actinides (III) and lanthanides (III) The present invention relates to a process for the selective separation of actinides (III) and lanthanides (III) from a reaction medium containing them. More specifically, the invention permits a selective extraction of actinides (III) by using an aqueous... | 10/20/1998 |
| 5792357 | Method and apparatus for back-extracting metal chelates A method of extracting metal and metalloid species from a solid or liquid substrate using a supercritical fluid solvent containing one or more chelating agents followed by back-extracting the metal and metalloid species from the metal and metalloid chelat... | 08/11/1998 |
| 5766478 | Water-soluble polymers for recovery of metal ions from aqueous streams A process of selectively separating a target metal contained in an aqueous solution by contacting the aqueous solution containing a target metal with an aqueous solution including a water-soluble polymer capable of binding with the target metal for suffic... | 06/16/1998 |
| 5758255 | Opposite phase entrainment reduction in solvent extraction/electrowinning circuits by addition of water soluble cationic polymers A method of reducing the entrainment of aqueous mineral acid solutions in organic extractants used in the solvent extraction of metals from the aqueous fluid is disclosed. The method comprises adding an effective, entrainment prevention amount of a water ... | 05/26/1998 |
| 5750081 | Solvent extraction of metal containing species A method of extracting metal species from a metal species containing medium which comprises contacting the medium with an extractant solvent which comprises a supercritical fluid and a complexant for solubilizing metal species in the said medium and also ... | 05/12/1998 |
| 5708958 | Method of separating trivalent actinides and rare earth elements A method is provided for separating trivalent actinides and rare earth elements in the TRUEX method using a CMPO-TBP mixed solvent. The method of separating trivalent actinides and rare earth elements comprises a trivalent actinide/rare earth extraction s... | 01/13/1998 |
