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| Number | Title | Issue Date |
| 7829044 | Phosphonamides, process for producing the same, and use thereof The invention provides a process by which rare earth metal ions can be efficiently extracted by easy operation, and effective extracting reagents for the process. Specifically, phosphonamides represented by the general formula [1]; a process for producing the same; ... | 11/09/2010 |
| 7553461 | Multivalent metal ion extraction using diglycolamide-coated particles A separation medium, a method for using that separation medium and an apparatus for selectively extracting multivalent cations such as pseudo-lanthanide, prelanthanide, lanthanide, preactinide or actinide cations from an aqueous acidic sample solution is described. ... | 06/30/2009 |
| 7435399 | Chromatographic extraction with di(2-ethylhexyl)orthophosphoric acid for production and purification of promethium-147 A method of producing and purifying promethium-147 including the steps of: irradiating a target material including neodymium-146 with neutrons to produce promethium-147 within the irradiated target material; dissolving the irradiated target material to form an acidi... | 10/14/2008 |
| 7338589 | Process for recovery of gallium The present invention relates to a process for the recovery of gallium from Bayer process liquors. Bayer process liquor is obtained from alumina industries and contains 450 g/L Na2O, 80 g/L Al2O3 and 190±20 ppm of gallium. The prese... | 03/04/2008 |
| 7312251 | Synthesis of stable solutions of rare earth tris (organophosphate) in hydrocarbon solvents Stable rare earth tris (organophosphate) solutions comprise a rare earth tris (organophosphate) and a hydrocarbon solvent. From about 2% to about 10% rare earth element, preferably from about 3% to about 8%, is present in the solutions. The rare earth tris (organoph... | 12/25/2007 |
| 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 |
| 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 |
| 7157022 | Multivalent metal ion extraction using diglycolamide-coated particles A separation medium, a method for using that separation medium and an apparatus for selectively extracting multivalent cations such as pseudo-lanthanide, prelanthanide, lanthanide, preactinide or actinide cations from an aqueous acidic sample solution is described. ... | 01/02/2007 |
| 7122164 | Niobate-based octahedral molecular sieves Niobate-based octahedral molecular sieves having significant activity for multivalent cations and a method for synthesizing such sieves are disclosed. The sieves have a net negatively charged octahedral framework, comprising niobium, oxygen, and octahedrally coordin... | 10/17/2006 |
| 7101484 | Sr-90/Y-90 radionuclide generator for production of high-quality Y-90 solution A process for purifying a stock Sr-90 solution containing stable and radioactive impurities, holding the purified Sr-90 solution for Y-90 ingrowth, and subsequently extracting the Y-90 from the Sr-90/Y-90 solution. The stock solution is sequentially passed through t... | 09/05/2006 |
| 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 |
| 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 |
| 6974563 | Ion exchange materials for the separation of 90Y from 90SR Inorganic ion exchange materials for the separation of 90Y from 90Sr include clinoptilolite, potassium titanosilicate pharmacosiderite, sodium titanosilicate and sodium nonatitanate. These materials are suitable for making a 90Y gene... | 12/13/2005 |
| 6736958 | Ion sensing method The present invention allows the determination of trace levels of ionic substances in a sample solution (ions, metal ions, and other electrically charged molecules) by coupling a separation method, such as liquid chromatography, with ion selective electrodes (ISE) p... | 05/18/2004 |
| 6667016 | Inorganic-organic hybrid gels for extracting species such as lanthanides and actinides, and their preparation Inorganic-organic hybrid gels can be employed to extract chemical species such as lanthanides and actinides and their preparation. The gels include a network of inorganic components with the formula: ##STR1## where M is Si, Ti, Zr or Al, wherein organic molecu... | 12/23/2003 |
| 6657081 | Calixarene derivatives The invention relates to new calixarenes according to the formula: ##STR1## wherein: R1 is an alkyl or aryl group, or a hydrogen atom, R2 and R3, which may be identical or different, are alkyl or aryl groups, n is a... | 12/02/2003 |
| 6630114 | Calixarene derivatives, preparation method and use of said derivatives to extract antinides and lathanides The invention relates to new calixarenes according to the formula: ##STR1## wherein R1 and R2, which may be identical or different, are alkyl, alkoxy or aryl groups, and n is an integer equal to 2, 3 or 4. Said calixarenes may be used to ... | 10/07/2003 |
| 6350419 | Combined supported liquid membrane/strip dispersion process for the removal and recovery of metals The present invention provides a novel process for the removal and recovery of metals 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 improve... | 02/26/2002 |
| 6312654 | Method of separating a trivalent actinide from a trivalent lanthanide and/or yttrium in aqueous solution The invention relates to a method of separating trivalent actinides from at least one trivalent lanthanide and/or yttrium, whereby the trivalent actinides are extracted from an aqueous solution containing a H+ concentration of 0.01 to 2 moles/l... | 11/06/2001 |
| 6312653 | Method for separating actinides and lanthanides by liquid-liquid extraction using calixarenes The invention involves a process for separating actinides and lanthanides by liquid-liquid extraction by means of calixarenes. These calixarenes have the formula: ##STR1## with R1 and R2 being alkyl groups or o-nitrophenoxy alkyl groups ... | 11/06/2001 |
| 6306355 | Method for separating actinides and lanthanides by membrane transport using a calixarene The invention involves the separation of actinides and lanthanides by membrane transport by means of a calixarene. To this end, a first aqueous solution containing at least one metal from the group of actinides and lanthanides to be separated is placed in... | 10/23/2001 |
| 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 |
| 6214301 | Hafnium radioisotope recovery from irradiated tantalum Hafnium is recovered from irradiated tantalum by: (a) contacting the irradiated tantalum with at least one acid to obtain a solution of dissolved tantalum; (b) combining an aqueous solution of a calcium compound with the solution of dissolved tantalum to ... | 04/10/2001 |
| 6110433 | Process for the recovery of metals from used nickel/metal/rare earth hydride storage batteries The invention relates to a process for recovering metals from used nickel/hydride storage batteries, in which storage battery scrap has been mechanically comminuted and divided into at least a coarse fraction and a fine fraction capable of being treated s... | 08/29/2000 |
| 6093376 | Selective separation of rare earth elements by ion exchange in an iminodiacetic resin A method is disclosed to separate the heavy rare earth elements Lu through Sm plus Y by an ion-exchange process called selective elution. Mixed rare earths are saturated onto a loading column containing sulfonic resin. Iminodiacetic resin in a separation ... | 07/25/2000 |
| 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 |
| 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 |
| 5945342 | Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation The present invention relates to methods for digesting diphosphonic acid substituted cation exchange resins that have become loaded with actinides, rare earth metals, or heavy metals, in a way that allows for downstream chromatographic analysis of the ads... | 08/31/1999 |
| 5911921 | Non-stoichiometric ytterbium phosphate powder of low infrared reflectivity Proposed is a powder of ytterbium phosphate having a non-stoichiometric phosphorus to ytterbium molar ratio of 1.08 to 2.0 and having a specified average particle diameter and specified diameter of the crystallites forming the particles. The powder is use... | 06/15/1999 |
| 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 |
| 5866087 | Calixarene derivatives, their preparation process and their use for extracting actinides and lanthanides The invention relates to novel calixarenes of formula: ##STR1## in which m is equal to 0 or 1, n is an integer from 2 to 8, with 4ࣘn(m+1)ࣘ8, R1 and R2, which can be the same or different, are alkyl or O-nitrophenoxyalkyl gro... | 02/02/1999 |
| 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 |
| 5787332 | Process for recovering tantalum and/or niobium compounds from composites containing a variety of metal compounds A process for treating composite materials comprising metals and having significant radioactivity for separation into concentrated individual products is provided. The process of the invention recovers valuable metals and semi-metal elements including rar... | 07/28/1998 |
| 5770085 | Extraction of metals and/or metalloids from acidic media using supercritical fluids and salts A method of extracting metalloid and metal species from a solid or liquid material by exposing the material to a fluid solvent, particularly supercritical carbon dioxide, containing a chelating agent is described. The chelating agent forms chelates that a... | 06/23/1998 |
| 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 |
| 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 |
| 5688975 | Rare earth stabilized Cr/Ti substituted molecular sieves Molecular sieve compositions have been synthesized which are resistant to the loss of framework atoms. Specifically, the molecular sieves of the invention have the empirical formula mA: (Mw Alx Siy)O2 where A is at l... | 11/18/1997 |
| 5682593 | Extraction of acids and metal salts from aqueous solutions with diethyl dodecylphosphonate Use of diethyl dodecylphosphonate (DEDP) for the extraction of acids and metal salts from aqueous solutions.... | 10/28/1997 |
