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8968698 Processes for recovering metals from aqueous solutions  
Provided herein are processes for recovering molybdenum and/or other value metals (e.g., uranium) present in aqueous solutions from a large range of concentrations: from ppm to grams per liter via...
8926924 Extraction process  
A method for the selective recovery of uranium from a sulphate-based acidic aqueous solution of uranium containing iron and other metals by means of solvent extraction, in which the extractant...
8883096 Extraction of uranium from wet-process phosphoric acid  
In a preferred embodiment, a process for extracting uranium from wet-process phosphoric acid (WPA), comprises separating uranium from WPA to produce a loaded uranium solution stream and a uranium...
8865094 Methods for separating medical isotopes using ionic liquids  
A method for extracting a radioisotope from an aqueous solution, the method comprising: a) intimately mixing a non-chelating ionic liquid with the aqueous solution to transfer at least a portion...
8795610 Process for reprocessing spent nuclear fuel not requiring a plutonium-reducing stripping operation  
The invention relates to a process for reprocessing spent nuclear fuel which, among other advantages, does not require a plutonium-reducing stripping operation. This process finds particular...
8454913 Use of butyraldehyde oxime as an anti-nitrous agent in an operation for the reductive stripping of plutonium  
The invention relates to the use of butyraldehyde oxime as an anti-nitrous agent in a plutonium stripping operation based on a reduction of this element from oxidation state (IV) to oxidation...
8394346 Method for treating spent nuclear fuel  
A method for treating spent nuclear fuel, which includes first decontaminating the uranium, plutonium and neptunium found in a nitric aqueous phase resulting from dissolving the nuclear fuel in...
8354085 Actinide and lanthanide separation process (ALSEP)  
The process of the invention is the separation of minor actinides from lanthanides in a fluid mixture comprising, fission products, lanthanides, minor actinides, rare earth elements, nitric acid...
8298510 Process for improving phase separations in solvent extraction circuits  
The addition of a compatible metal salt crystal to the organic solution entering the mixer(s) in the solvent extraction stage(s) and/or the stripping stage(s), or to the emulsion mixture of the...
8221640 Method of dissolving the solids formed in a nuclear plant  
The method of dissolving the solids formed in the apparatus and pipework of a nuclear plant, in which the solids are brought into contact with an aqueous dissolving solution chosen from aqueous...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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.
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...
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.
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...
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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