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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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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 dilue...
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7927566 |
Extraction of radionuclides by crown ether-containing extractants
The present invention relates to a treatment of high-level waste of radiochemical production containing radionuclides and macro-admixtures including sodium. The method of extraction of...
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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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7799226 |
Separation of no-carrier-added thallium radionuclides from no-carrier-added lead and mercury radionuclides by dialysys
A process for separation of no-carrier-added thallium radionuclide from no-carrier-added lead and mercury comprising providing a solution of no-carrier-added thallium radionuclide and...
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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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7763566 |
Method and composition for sorbing toxic substances
Toxic substances such as heavy metals are extracted from a medium using a sorbent composition. The composition is derived by sulfidation of red mud, which contains hydrated ferric oxides derived...
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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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7731870 |
Purex method and its uses
The invention relates to a method constituting an improvement of the PUREX method, which makes it possible to obtain separation of uranium from the other actinides (Pu, Np, Th, . . . ) in a single...
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7678275 |
Method and equipment for liquid-liquid extraction
The invention relates to a method for reversing the dispersion formed in the mixing section of liquid-liquid extraction and kept condensed in the separation section and the separated solutions form...
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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...
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7655199 |
Process for uranium recovery using anion exchange resin
The present invention relates to a process for the recovery of uranium in high silica environments comprising the use of a strong base macroreticular ion exchange resin.
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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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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 (“DtBu18C...
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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...
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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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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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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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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...
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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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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...
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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...
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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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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...
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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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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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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...
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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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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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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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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...
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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: ##S...
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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...
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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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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...
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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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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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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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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...
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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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5666642 |
Extraction of cesium and strontium ions from nuclear waste
Methods and agents for extracting cesium and strontium ions from aqueous solutions, including aqueous fission product waste solutions, are disclosed using substituted metal dicarbollide ions...
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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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5422084 |
Process for dissolving plutonium dioxide by means of OH- radicals produced by the radiolysis of water usable for the treatment of dissolving fines and plutoniferous waste
The invention relates to a process for dissolving plutonium dioxide by means of OH- radicals produced by radiolysis of water and usable for the treatment of dissolving fines and plutoniferous...
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5419887 |
Separation of the isotopes of boron by chemical exchange reactions
The isotopes of boron, 10 B and 11 B, are separated by means of a gas-liquid chemical exchange reaction involving the isotopic equilibrium between gaseous BF3 and a liquid BF3 . donor molecular...
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5344624 |
Method for recovering with the aid of a crown compound plutonium (IV) present in solutions, such as aqueous effluents, concentrated solutions of fission products and concentrated solutions of plutonium
The invention concerns the recovery of Pu (IV) by using crown compounds.According to the invention, the aqueous solution containing the plutonium (IV) is placed in contact with at least one crown...
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