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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...
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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...
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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...
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7780921 |
Ultrasonic counter-current screw extractor for uranium recovery
An apparatus for the removal of uranium from a body of material is provided. The apparatus has at least one ultrasonic extractor, having a bottom and a top. The at least one ultrasonic extractor is...
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7754167 |
Method for separating trivalent americium from trivalent curium
A method is disclosed for separating trivalent americium from trivalent curium, coming from an aqueous solution containing at least these cations, wherein, at an acid concentration of 0.01...
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7704468 |
Method for forming an extraction agent for the separation of actinides from lanthanides
An extraction agent for the separation of trivalent actinides from lanthanides in an acidic media and a method for forming same are described, and wherein the methodology produces a stable...
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7635459 |
Method of removing nitric acid from aqueous liquid and method of producing drinks
Disclosed is a method of removing nitric acid from an aqueous liquid containing various components such as vegetable extract, and nitrate ion is removed selectively without spoiling the taste or...
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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...
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7527772 |
Ultrasonic counter-current screw extractor for uranium recovery and process therefore
An apparatus and method to remove uranium from a body of material wherein the method includes the steps of depositing the body of solid material in an ultrasonic extractor and depositing an amount...
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7491345 |
Extraction mixture for recovery of actinide elements from acidic solutions
Extraction mixture capable of recovering actinide elements such as U, Pu and transplutonium elements from radioactive liquid waste in reprocessing of spent nuclear fuel. One embodiment of the...
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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...
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7390934 |
Apparatus and method for aiding in the removal of enriched uranium from soils
A method and apparatus for removing uranium (IV) and uranium (VI) from sands and soils. The method and device assays a volume of soil and determines a presence and position of uranium enrichment. A...
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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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7192563 |
Process for recovery of high purity uranium from fertilizer grade weak phosphoric acid
A two-cycle countercurrent extraction process for recovery of highly pure uranium from fertilizer grade weak phosphoric acid. The proposed process uses selective extraction using di-(2-ethyl hexyl)...
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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...
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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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6645453 |
Solvent extraction process for recovery of uranium from phosphoric acid (25-55% P205)
An improved process of extraction of uranium from phosphoric acid and in particular uranium VI from phosphoric acid especially strong phosphoric acid using a selective synergistic extractant mix of...
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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 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...
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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...
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6504077 |
Method for the decontamination of metallic surfaces
A method of decontaminating a radioactively contaminated oxide on a surface. The radioactively contaminated oxide is contacted with a diphosphonic acid solution for a time sufficient to dissolve...
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6468445 |
Solvent for the simultaneous recovery of radionuclides from liquid radioactive wastes
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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6436358 |
Metals removal from spent salts
A method and apparatus for removing metal contaminants from the spent salt of a molten salt oxidation (MSO) reactor is described. Spent salt is removed from the reactor and analyzed to determine...
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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...
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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 R1 and R2 being alkyl...
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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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6303090 |
Conversion of depleted uranium hexafluoride to a solid uranium compound
A process for converting UF6 to a solid uranium compound such as UO2 and CaF. The UF6 vapor form is contacted with an aqueous solution of NH4 OH at a pH greater than 7 to precipitate at least some...
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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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6137027 |
Solid waste treatment agent and treatment method of solid waste
Disclosed herein are a solid waste treatment agent comprising phosphorous acid or a derivative thereof and/or hypophosphorous acid or a derivative thereof, or phosphorous acid or a derivative...
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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...
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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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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, R1 and R2, which can be the same or different, are alk...
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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...
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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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5702676 |
Production method for obtaining pressable powder yielding high sinter density pellets without defects
This invention provides an improved process of preparing UO2 powder from poor quality, partially oxidized powder containing organic and inorganic impurities. The process is illustrated in the flow...
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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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5625862 |
Aqueous biphasic plutonium oxide extraction process with pH and particle control
A method for simultaneously partitioning a metal oxide and silica from a material containing silica and the metal oxide, using a biphasic aqueous medium having immiscible salt and polymer phases.
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5587142 |
Method of dissolving metal oxides with di- or polyphosphonic acid and a redundant
A method of dissolving metal oxides using a mixture of a di- or polyphosphonic acid and a reductant wherein each is present in a sufficient amount to provide a synergistic effect with respect to...
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5585043 |
Method of coextracting neptunium and plutonium
In a method of coextracting neptunium and plutonium, a nitric acid solution containing a mixture of neptunium and plutonium is oxidized by irradiation of ultraviolet light. As a result, different...
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5500192 |
Method of separating neptunium and plutonium
In a method of separating neptunium and plutonium, a nitric acid solution containing a mixture of neptunium and plutonium is oxidized by irradiation of ultraviolet light in the presence of a...
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5468456 |
Batch extracting process using magneticparticle held solvents
A process for selectively removing metal values which may include catalytic values from a mixture containing same, wherein a magnetic particle is contacted with a liquid solvent which selectively...
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5463177 |
Solvent extraction process
The extraction process includes supplying solvent under gas pressure for introduction of the solvent adjacent the bottom of a vessel containing the sample. The vessel lies in a water bath and...
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5443731 |
Process for extracting technetium from alkaline solutions
A process for extracting technetium values from an aqueous alkaline solution containing at least one alkali metal hydroxide and at least one alkali metal nitrate, the at least one alkali metal...
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5437847 |
Method of separating and recovering ruthenium from high-level radioactive liquid waste
A method of recovering volatile ruthenium, which is separated and formed by constant potential electrolysis from high-level radioactive liquid waste discharged from the reprocessing step of spent...
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5409678 |
Separations of actinides, lanthanides and other metals
An organic extracting solution comprised of a bis(acylpyrazolone or a substituted bis(acylpyrazolone) and an extraction method useful for separating certain elements of the actinide series of the...
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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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5276251 |
Process for treating organic phosphoric acids
A process for treating organic phosphates, comprising (a) mixing a waste organic solvent mainly composed of an organic phosphate with an additive mainly composed of at least one of metal salts of...
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5246901 |
Polysulfonic acids
This invention provides novel compositions comprising aryl phosphonic or phosphinic acids substituted with more than one sulfo radical. These novel compounds may be reacted with tetravalent metal...
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5188736 |
Process for the separation and recovery of extractant from spent solvent
A new chemical separation process was developed in this invention using 2-methoxyethanol or methyl collosolve (MCS) and ethylene glycol (EG) as separation agents, to separate the valuable...
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