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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...
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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...
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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 E 1 from at least one chemical element E 2 from an aqueous solution containing said elements, which employs a...
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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...
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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...
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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...
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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...
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6974563 |
Ion exchange materials for the separation of 90Y from 90SR
Inorganic ion exchange materials for the separation of 90 Y from 90 Sr include clinoptilolite, potassium titanosilicate pharmacosiderite, sodium titanosilicate and sodium nonatitanate. These...
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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,...
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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...
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6657081 |
Calixarene derivatives
The invention relates to new calixarenes according to the formula: wherein: R 1 is an alkyl or aryl group, or a hydrogen atom, R 2 and R 3 , which may be identical or different, are alkyl or...
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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: wherein R 1 and R 2 , which may be identical or different, are alkyl, alkoxy or aryl groups, and n is an integer equal to 2, 3...
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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...
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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 R 1 and R 2 being...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 4≤n(m+1)≤8, R 1 and R 2 , which can be the same or...
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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...
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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...
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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...
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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...
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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...
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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...
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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: (M w Al...
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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.
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5678242 |
Membrane extraction with thermodynamically unstable diphosphonic acid derivatives
Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and...
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5639433 |
Extraction of rare earth elements using alkyl phosphinic acid or salt/alkyl or aryl phosphonic acid or ester blends as extractant
A method is disclosed whereby rare earth elements are extracted from acidic solutions thereof using, as an extractant, a mixture of an alkyl (C 4 -C 12 ) phosphinic acid or salt and an alkyl (C 4 ...
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5595714 |
Recovery of gadolinium and its complexing agents from aqueous solutions containing their complexes
The invention refers to a novel process for the recovery of gadolinium and its complexing agent from aqueous solutions containing their complexes and/or salts of said complexes.
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5492680 |
Separation of scandium from tantalum residue using fractional liquid-liquid extraction
A process for separating scandium from an aqueous solution comprised of a first group of metals, scandium and a second group of metals includes the steps of: (a) providing a scandium-containing...
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5470479 |
Continuous, steady-state, chromatographic separation of gadolinium isotopes
A method and apparatus for the partial or complete continuous separation of isotopes of gadolinium, especially high thermal neutron capture cross-section gadolinium isotopes, using continuous,...
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5437795 |
Chromatographic separation of erbium isotopes
A process for the partial or complete simultaneous separation of isotopes of erbium, especially high thermal neutron capture cross-section erbium isotopes, using continuous, steady-state,...
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5409677 |
Process for separating a radionuclide from solution
A process for separating a radionuclide such as radioactive Cu-64 from a mixture containing the radionuclide and a precursor element from which the radionuclide is formed. A weak acid solution is...
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5368736 |
Process for the separation and purification of yttrium-90 for medical applications
An extraction chromatographic method for the preparation of 90 Y of high chemical and radiochemical purity is disclosed. After an initial purification of a 90 Sr stock solution and a suitable...
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5338520 |
Recovery of neodymium/didymium values from bastnaesite ores
Neodymium or didymium values are selectively recovered from bastnaesite ores, essentially to the exclusion of cerium and trace amounts of thorium, by (i) calcining the bastnaesite ore, (ii)...
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5332531 |
Extracting metal ions with diphosphonic acid, or derivative thereof
Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and...
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5330731 |
Process for separation of zirconium-88, rubidium-83 and yttrium-88
A process for selective separation of strontium-82 and strontium-85 from proton irradiated molybdenum targets is provided and includes dissolving the molybdenum target in a hydrogen peroxide...
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5314526 |
Metallothermic reduction of rare earth fluorides
A process is disclosed for the calcium reduction of rare earth fluorides, especially neodymium and/or praseodymium fluorides, in a minimum volume stirred molten calcium chloride reaction medium...
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5266282 |
Selective liquid/liquid extraction of yttrium from other rare earths values
Yttrium is selectively separated from other rare earth values by contacting a mixed aqueous solution thereof that contains nitrate ions with a water-immiscible organic phase which includes a...
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5258167 |
Extractant for rare earth metal and method for extracting the same
An extractant for extracting rare earth metal ions comprises, for instance, di-(3-methylcyclohexyl)phosphoric acid, di-1-ethylpentylphosphoric acid, docosyl-(2 isopropyl-5-methylcyclohexyl)...
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5225173 |
Methods and devices for the separation of radioactive rare earth metal isotopes from their alkaline earth metal precursors
Methods and devices for the separation of a radioactive rare earth metal isotopes or a radioactive isotope of yttrium or scandium from their alkaline earth metal precursors with ionizable dibenzo...
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5223232 |
Process for separating iron and/or zirconium from the actinides and/or lanthanides present in an aqueous acid solution by means of a propane diamide
The invention relates to a process for separating iron and/or zirconium from the actinides and/or lanthanides present in an aqueous acid solution by means of a propane diamide. According to the...
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