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Matches 151 - 200 out of 1,223

Document Document Title
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¿ ...  
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...  
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 ...  
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...  
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....  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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 ...  
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...  
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...  
WO1996039702A3  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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 ...  
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. ...  
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...  
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.  
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...  
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...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
WO/1992/017887A1
The present invention describes a process to separate magnesium from magnesium slag when the magnesium slag contains radioactive thorium and its daughters. The process concentrates the radioactive thorium and its radioactive daughters fr...  
WO/1992/004474A1
A process for removing molybdenum from uranium bearing solutions reduces molybdenum contamination of uranium product. The process employs solvent extraction techniques to remove molybdenum by using a molybdenum-selective extraction reage...  
WO/1991/013182A1
A process for the deoxidation of a refractory metal containing minor concentrations of oxygen is disclosed. In this process the refractory metal is contacted with a metallic deoxidant in a dry, inert atmosphere. The metallic deoxidant an...  
WO/1990/011826A1
A uranium adsorbent is prepared by reacting a polymer containing nitrile groups with hydroxylamine, wherein the amount of imidedioxime groups formed is relatively larger than that of amidoxime groups formed in terms of the integral value...  
WO/1990/000524A1
A process for removing transuranic elements from a waste chloride electrolytic salt containing transuranic elements in addition to rare earth and other fission product elements so the salt waste may be disposed of more easily and the val...  
WO/1989/000885A1
An adsorbent is prepared by mixing at least one member selected from a first group consisting of metal oxides and metal compounds capable of partly or wholly forming metal oxides when heated in an oxygen-containing atmosphere with at lea...  
WO/1989/000081A1
An adsorbent is prepared by mixing at least one member selected from a first group consisting of metal oxides and metal compounds capable of partly or wholly forming metal oxides when heated in an oxygen-containing atmosphere with at lea...  
WO/1988/008323A1
A method for a quantitative separation of scandium from thorium comprises adsorption of both metals on a cation exchange resin followed by selective elution of scandium with an acidic solution of a chelating agent followed by the elution...  
WO/1986/007097A1
A method of obtaining a desired metal, selected from the group consisting of titanium, aluminium, iron, manganese, hafnium, zirconium, tantalum, vanadium, uranium and tungsten, which comprises reacting a halide of the desired metal with ...  

Matches 151 - 200 out of 1,223