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WO/2000/031747A1 |
The invention concerns a method comprising a step which consists in passing the powder through a unit for reducing (24) the average size of the powder particles, bringing about a modification in the general appearance of the spectrum of ...
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WO/1999/066086A1 |
The invention concerns a method for dissolving plutonium or a plutonium alloy by contacting with an aqueous dissolving mixture, wherein said dissolving mixture comprises nitric acid, a carboxylic acid with complex-forming properties with...
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WO/1999/062824A1 |
There is described a method for treating or reprocessing spent nuclear fuel in which an organic phase is contacted with an aqueous nitric acid phase containing zirconium, technetium and at least one extractable actinide metal such that t...
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WO/1999/028514A1 |
The invention provides a method for extracting one or more selected species from a sample, the selected species comprising one or more metallic elements, preferably of pentavalent or higher valency form such as Neptunium v, or one or mor...
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WO/1999/024396A1 |
The invention pertains to compounds for binding lanthanide ions and actinide ions. The invention further pertains to compounds for binding radionuclides, and to methods of making radionuclide complexes. Also, the invention pertains to me...
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WO/1999/023263A1 |
The present invention is directed to a process for removing various contaminants (e.g., organic collectors, contaminant metals or spectator ions, and/or suspended and colloidal solids) from process streams in leaching processes. The cont...
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WO/1999/015707A1 |
The invention provides incorporating techniques, detector techniques and extraction techniques. A method for producing a system adapted to interact with a dissolved species, the method comprising providing a first component incorporating...
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WO/1999/014386A1 |
The invention relates to a method for separating trivalent actinides from at least trivalent lanthanides, whereby said trivalent actinides are extracted from an aqueous solution containing a H?+¿ concentration of 0.01 to 2 mol/1 by usin...
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WO/1999/011575A1 |
The invention relates to a method for treating uranium compounds from mining water in uranium mines where the rock has been lixiviated with sulfuric acid during a groundwater sanitation process, while the mining waste can be recycled in ...
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WO/1999/010087A1 |
The invention concerns a method for separating actinides and lanthanides by membrane transport using a calixarene which consists in introducing in compartment (3) a first aqueous solution containing at least one metal to be separated fro...
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WO/1999/010545A1 |
The invention concerns a method for separating actinides and lanthanides by liquid-liquid extraction using calixarenes. Said calixarenes correspond to formula (II) with R?1¿ and R?2¿ being alkyl or o-nitrophenoxyalkyl groups and R?3¿ ...
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WO/1999/005330A1 |
The invention concerns metallothermal process and continuous drawing of a metal product consisting of at least one metal, comprising: a step for melting the metal in a first cold crucible (1) heated by induction where the reduction of sa...
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WO/1998/055201A1 |
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 polyether to the contaminated solution to form ...
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WO/1998/019779A1 |
A process for oxidation of ferrous ions in solution, and more particularly a process for improved base metal and/or uranium leaching from ores, concentrates or tailings using ferric ion as an oxidising agent. A reaction vessel (10) holds...
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WO/1998/018929A1 |
The invention relates to nucleic acids that encode a secondary transporter that transports citrate or the complex of citrate and metal ions or metal salt ions. These nucleic acids can be functionally expressed in host cells such as $i(E....
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WO/1998/008994A1 |
Apparatus for the solidification by desublimation of a sublimed gaseous substance and the subsequent trapping and liquidation of said desublimed substance is described, the apparatus comprising: means for the supply of a coolant fluid to...
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WO/1998/004754A1 |
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 an...
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WO/1998/002594A1 |
A metal species (particularly an actinide, e.g. Am(III)) is extracted from a mixture (particularly one including lanthanide species e.g. Eu(III)) by adding a triazine compound to the mixture so that it forms a complex with the desired me...
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WO/1998/001866A1 |
Solid and liquid substrates, such as soil and solvents having radioactive metals or hazardous non-radioactive metals are decontaminated with the aid of cyanide ion generated $i(in situ) to form co-ordination compounds with the unwanted m...
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WO/1997/047015A1 |
An apparatus and method is described for transmuting higher actinides, plutonium and selected fission products in a liquid-fuel subcritical assembly. Uranium may also be enriched, thereby providing new fuel for use in conventional nuclea...
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WO/1997/036013A1 |
A process for recovering metal values from a metal containing material including the metal values comprising digesting the metal containing material in a sulfuric acid solution comprising: sulfuric acid, a reducing agent, and a carbon so...
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WO/1997/036011A1 |
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 me...
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WO/1997/036014A1 |
The processes of the present invention include mineral acid leaching of a metal-containing material, such as an ore residue, containing fluoridated metal values in the presence of a complexing agent which will complex fluoride ions. The ...
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WO/1997/027595A1 |
In the reprocessing of irradiated nuclear fuel, fluorination of the fuel is carried out by feeding the fuel to an ionised gas plasma and then contacting the resultant excited species with a fluorinating agent, for example, fluorine, so a...
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WO/1997/016575A1 |
A method of extracting metals directly from metal oxides by exposing the oxide to a supercritical fluid solvent containing a chelating agent is described. Preferably, the metal is an actinide or a lanthanide. More preferably, the metal i...
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WO/1996/039703A1 |
A method and apparatus producing halogenated products from metal halide feeds. In one embodiment, uranium hexafluoride is treated by separating fluorine from the metal of the uranium hexafluoride. Uranium hexafluoride is introduced into ...
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WO/1996/039702A2 |
Methods and agents for extracting cesium and strontium ions from aqueous solutions, including aqueous fission product waste solutions, are disclosed using substituted metal dicarbollide and/or dicarbaextra�ide ions containing one or mo...
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WO/1996/038380A1 |
The process for converting feed materials of high mineral content containing primary metal values and fluorine values to the primary metal or useful compounds thereof and to fluorine values or useful compounds thereof, wherein the feed m...
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WO/1996/038381A1 |
A method of biotreating a solid material to remove an undesired compound using a nonstirred surface bioreactor is provided. According to the method, the surface of a plurality of coarse substrates is coated with a solid material to be bi...
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WO/1996/036971A1 |
The present invention relates to a process for removing rare earth elements (RE) from spent nuclear fuel. The spent nuclear fuel is subjected to an oxidation step at a temperature of between about 200� to about 800 �C and a heating s...
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WO/1996/033132A1 |
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 containing one or more chemical groups that in...
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WO/1996/032729A1 |
A method for the processing of oxide nuclear fuel containing uranium is described, the method including the step of reacting the oxide with a fused alkali metal carbonate to produce a compound which may be further processed so as to extr...
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WO/1996/025526A1 |
The invention concerns a process for separating uranium, radium and arsenic from solutions of their compounds, uranium being bonded and separated by means of anion exchangers, radium being separated by physical and/or chemical bonding to...
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WO/1996/015987A1 |
This invention relates to a process for separating U or Th values from values of at least one other metal such as Ta, Nb, Sc, Zr, Ti or Mg, wherein all of the values are contained in a difficult soluble matrix of highly fluorinated feed ...
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WO/1996/008324A1 |
Soil including sand and clays contaminated with nuclear waste materials, elemental mercury or as mixed waste with hazardous organic compounds are decontaminated by treating with anhydrous liquid ammonia alone or with solvated electrons. ...
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WO/1996/008323A1 |
Soil including sand and clays contaminated with nuclear waste materials and/or ions of hazardous non-radioactive metals or metalloids are decontaminated by treating with anhydrous liquid ammonia alone or in combination with solvated elec...
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WO/1995/026557A1 |
A method for reducing the amount of uranium in solution, apparatus for the performance of the method and a precipitate formed by such performance.
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WO/1995/024510A1 |
A process for facilitating removal of one or more impurities from titaniferous material containing the impurities in a form which is highly soluble in acid. The material is in turn leached with a sulphuric acid solution and with a hydroc...
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WO/1995/023240A1 |
A process for the extraction of uranium from a uranium containing material by a leaching process which is catalysed by a catalytic agent. In a process where dissolution of a uranium mineral present in the material occurs due to action of...
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WO/1995/017409A1 |
Diphosphine dioxides for removing actinides such as Pu, Am and Np from aqueous effluents and fission product concentrates from waste nuclear fuel reprocessing plants. The diphosphine dioxides have one of the following formulae (I) and (I...
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WO/1995/013985A1 |
The process for recovering Ta/Nb values from highly fluorinated ore materials by the process of: (a) contacting the materials with one or a mixture of HNO3 or HC1, and H3BO3 wherein the H3BO3 to other acid molar ratio is from about 1/10 ...
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WO/1995/011509A1 |
A method of cycling a nuclear fuel for a fast breeder and a minor actinoids annihilation reactor, which provides a nuclear fuel cycle having technical advantages, such as a safety inherent in a nuclear reactor, a short fuel doubling time...
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WO/1994/026405A1 |
A rotary kiln, particularly for producing uranium dioxide from uranium hexafluoride, has an inlet arrangement (1) and a heated rotatable barrel (14). Uranium hexafluoride and steam react together in the inlet arrangement (1) to form uran...
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WO/1994/012502A1 |
Bis-crown calix[4]arenes of formula (I), wherein R1 and R2 are X(C2H4X)m and X(C2H4X)n respectively, wherein X = 0, NH and/or N(CH3), m and n = 3, 4, 5 or 6, or X(C2H4X)p/2 and YX(C2H4X)p/2 respectively, wherein p = 2 or 4 and Y = cycloa...
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WO/1994/003647A1 |
A process for facilitating the removal of impurities e.g. radionuclides, such as uranium and thorium, and/or one or more of their radionuclide daughters, from titaniferous material includes contacting the titaniferous material with one o...
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WO/1994/001190A1 |
A process for recovering metal (17) and acid values (48) from a source material (22) containing metallic fluorides comprises digesting (10) the source material in sulfuric acid (20) to form a slurry, separating (12) a fluoride containing...
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WO/1994/001527A1 |
Anions of the formula (I): [DA5M30-xO110-x(M\'L)x]m- in which D is Na+, Ca2+; A is P, As, Sb, Si, Ge, or combinations thereof, M is W5+, W6+, or mixtures thereof; M\' is a metallic element from groups 2 to 15 of the periodic table; other...
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WO/1993/019184A1 |
Disclosed is a biological process for recovering plutonium from soils using an iron-reducing microbe. A process for obtaining such microbes is disclosed. The invention process gives upwards of about 89 % yield of plutonium from soils. Fu...
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WO/1993/011113A1 |
Process for the selective extraction of actinides (III) using amides having a nitrogenous heterocyclic substituant of the formula (I) or (II), in which R1 is an alkyl or alkoxy group or a hydrogen atom, R2 and R3 which are the same or di...
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WO/1993/009543A1 |
A method is disclosed for reducing the volume of a radioactive composition by separating a radioactive first component from a second component of the radioactive composition. The method includes directing the radioactive composition into...
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