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| Number | Title | Issue Date |
| 7776302 | Fluorine extraction systems and associated processes Fluorine extraction systems and associated processes are described herein. In one embodiment, a fluorine extraction process can include loading a mixture containing a uranium fluoride (UxFy, where x and y are integers) and an oxidizing agent in... | 08/17/2010 |
| 7422626 | Method and device for declogging filter A method of declogging at least one filter of a plant for manufacturing uranium oxide from uranium hexafluoride, including separating, from the wall of the filter, uranium oxyfluoride particles deposited, by a stream of inert gas such as nitrogen, injected into the ... | 09/09/2008 |
| 7374940 | Method and apparatus for determining the progress of a uranium oxyfluoride conversion reaction in a furnace and for controlling the reaction A substance in a condensed state, for example a powdered solid, is in continuous movement in the longitudinal direction (6) of a furnace (4, 5). A reactive gas mixture is brought into contact with the substance in the condensed state. A plurality of sa... | 05/20/2008 |
| 7357910 | Method for producing metal oxide nanoparticles Method for producing metal oxide nanoparticles. The method includes generating an aerosol of solid metallic microparticles, generating plasma with a plasma hot zone at a temperature sufficiently high to vaporize the microparticles into metal vapor, and directing the... | 04/15/2008 |
| 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) phosphoric acid (D2EHPA) and tri-n-butyl phosphate (TBP) with refine... | 03/20/2007 |
| 7063823 | Depleted UFprocessing plant and method for processing depleted UF A depleted UF6 processing plant including a first fluidized bed reactor configured to react depleted UF6 with steam to produce UO2F2 and hydrogen fluoride, a second fluidized bed reactor connected to the first fluidized be... | 06/20/2006 |
| 7029633 | Method and apparatus for reducing uranium trioxide Uranium trioxide is reduced to uranium dioxide using microwave radiation or radiofrequency radiation directed in such a way that the radiation encounters an interface between uranium trioxide and the uranium-containing reduction product without first having passed t... | 04/18/2006 |
| 6759027 | Method and installation for carrying out a three phase chemical reaction under pressure A gas siphon type reactor (10) is used to carry out a three phase chemical reaction under pressure, such as the reduction of uranyl nitrate to uranous nitrate by hydrogen, in the presence of a catalyst made up of platinum on a silica carrier. The control of t... | 07/06/2004 |
| 6733699 | Method for producing nuclear fuel pellets of the MOX type A method for producing mixed oxide nuclear fuel pellets comprises the steps of preparing an U-Pu oxide blend powder having a Pu content in excess of the finally desired value, preparing uranium oxide powder, mixing adequate quantities of both powders in order to ach... | 05/11/2004 |
| 6451274 | Depleted UF6 processing plant and method for processing depleted UF6 The object of the present invention is to simplify the depleted UF6 processing plant and processing method and to prevent calcium fluoride to be a fine powder, wherein the processing plant comprises a first fluidized bed reactor for forming UO | 09/17/2002 |
| 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 higher oxidation state. The initial metal may be in the fo... | 04/30/2002 |
| 6352677 | Process to produce commercial grade anhydrous hydrogen fluoride (AHF) and uranium oxide from the delfuorination of uranium hexafluoride (UF6) The invention relates to a method for recovering products from the defluorination of uranium hexafluoride. Recovered are a commercial grade anhydrous hydrogen fluoride and triuranium oxide through the use of two distinct reactors.... | 03/05/2002 |
| 6228337 | Method for reducing uranium trioxide Uranium trioxide Is reduced to uranium dioxide using microwave radiation or radiofrequency radiation directed in such a way that the radiation encounters an Interface between uranium trioxide and the uranium-containing reduction product without first havi... | 05/08/2001 |
| 6153164 | Method for producing uranium oxide from uranium tetrafluoride and a phyllosilicate mineral A method for producing uranium oxide includes combining uranium tetrafluoride and a phyllosilicate mineral containing a solid oxidizing agent within the mineral's structure having a lower thermodynamic stability than the uranium oxide; heating the combina... | 11/28/2000 |
| 6136285 | Method and apparatus for direct conversion of uranium hexafluoride into uranium oxide The conversion apparatus comprises in succession: a reactor provided with injectors of UF6, steam, and nitrogen so as to cause UO2 F2 to be formed by hydrolysis; a rotary tubular pyrohydrolysis furnace for transforming UO | 10/24/2000 |
| 6110437 | Method for preparing a mixture of powdered metal oxides from nitrates thereof in the nuclear industry A thermal decomposition method useful in the nuclear industry for preparing a powdered mixture of metal oxides having suitable reactivity from nitrates thereof in the form of an aqueous solution or a mixture of solids. According to the method, the solutio... | 08/29/2000 |
| 6096281 | Method for producing uranium oxide from uranium oxyfluoride A method for producing uranium oxide includes combining uranium oxyfluoride and a solid oxidizing agent having a lower thermodynamic stability than the uranium oxide after "oxide"; heating the combination below the vapor point of the uranium oxyfluoride t... | 08/01/2000 |
| 6086836 | Method for producing uranium oxide from uranium oxyfluoride and silicon A method for producing uranium oxide includes combining uranium oxyfluoride and silicon and heating the combination below the vapor point of the uranium oxyfluoride to sufficiently react the uranium oxyfluoride and silicon to produce uranium oxide and a n... | 07/11/2000 |
| 6033642 | Method for producing silicon tetrafluoride from uranium oxyfluoride A method for producing silicon tetrafluoride includes combining uranium oxyfluoride and silicon dioxide; heating the combination below the melting point of the uranium oxyfluoride to sufficiently react the uranium oxyfluoride and the silicon dioxide to pr... | 03/07/2000 |
| 5935528 | Multicomponent fluid feed apparatus with preheater and mixer for a high temperature chemical reactor A multicomponent fluid feed apparatus is disclosed that independently preheats and then mixes two or more fluid streams being introduced into a high temperature chemical reactor to promote more rigorous and complete reactions using assemblies of inert tub... | 08/10/1999 |
| 5918106 | Method for producing uranium oxide and a non-radioactive fluorine compound from uranium tetrafluoride and a solid oxide compound A method for producing uranium oxide includes combining uranium tetrafluoride and a solid oxidizing agent having a lower thermodynamic stability than the uranium oxide; heating the combination below the vapor point of the uranium tetrafluoride to sufficie... | 06/29/1999 |
| 5901338 | Method for producing uranium oxide and silicon tetrafluoride from uranium tetrafluoride, silicon, and a gaseous oxide A method for producing uranium oxide includes combining uranium tetrafluoride, silicon and a gaseous anhydrous oxidizing agent having a lower thermodynamic stability than any oxide of uranium produced; heating the combination below the vapor point of the ... | 05/04/1999 |
| 5888468 | Method for producing silicon tetrafluoride from uranium tetrafluoride A method for producing silicon tetrafluoride includes combining uranium tetrafluoride and silicon dioxide; heating the combination below the melting point of the uranium tetrafluoride to sufficiently react the uranium tetrafluoride and the silicon dioxide... | 03/30/1999 |
| 5875385 | Method for the control of the composition and physical properties of solid uranium oxides The present invention provides a method for varying and controlling the chemical composition and physical properties of the uranium oxide solids produced by the thermal conversion of UF6. The method allows the production of predominantly UO | 02/23/1999 |
| 5757087 | Oxidation of uranium hexafluoride The present invention provides a process for the oxidation of uranium hexafluoride by injecting the uranium hexafluoride and an oxidant gas together into a reaction vessel to form a plume characterized in that a plurality of the said plumes are formed tog... | 05/26/1998 |
| 5752158 | Thermal process for the conversion of uranium hexafluoride A single-step process for producing solid uranium oxide and gaseous HF from UF6 which comprises bringing together two gaseous reactant streams, one of said streams comprising UF6 optionally admixed with oxygen as O2, and t... | 05/12/1998 |
| 5698173 | Purification of uranium alloys by differential solubility of oxides and production of purified fuel precursors A method for purifying metallic alloys of uranium for use as nuclear reactor fuels in which the metal alloy is first converted to an oxide and then dissolved in nitric acid. Initial removal of metal oxide impurities not soluble in nitric acid is accomplis... | 12/16/1997 |
| 5628048 | Process for obtaining uranium trioxide by direct thermal denitration of uranyl nitrate Process for obtaining uranium trioxide from a uranyl nitrate solution, the trioxide obtained having to have a specific surface between 12 and 15 m2 /g, consisting of producing in a zone of the reaction chamber called the contact zone, a thermom... | 05/06/1997 |
| 5527378 | Sintering uranium purification process Finely powdered urania scrap materials are subjected to sintering conditions (greater than 1600° C.) in a hydrogen atmosphere for about 4 to 8 hours in order to remove impurities (such as Si, Fe, Ni, Sn, Cu, Na and Pb). The process upgrades the quality o... | 06/18/1996 |
| 5091120 | Process for obtaining UO2 fuel pellets from metallic U without producing any effluent Process for obtaining nuclear fuel pellets, which produces no liquid effluent, for which the starting product is metallic uranium, which is oxidized to U3 O 8, then crushed and either reduced to UO2 and activated (or vice ... | 02/25/1992 |
| 5087606 | Bismuth-containing superconductors containing radioactive dopants A process for producing a sinterable doped superconductive powder which contains a sufficient amount of superconductive compound which is at least coated with sufficient uranium-235 and/or plutonium-239 dopant atoms to enable the sinterable powder to be f... | 02/11/1992 |
| 5069888 | Process for passivating uranium oxides to control oxidation A method of passivating the surface of particulate uranium oxides is disclosed comprising a process of continuously contacting uranium oxide particles with an oxygen containing and cooling counter flowing gas stream. The treatment produces a protective su... | 12/03/1991 |
| 5066429 | Method for passivating uranium oxides to control oxidation, and the oxidation resisting uranium product thereof A process for controlling the oxidation reaction of oxides of uranium and fixing the ratio of oxygen to uranium in uranium oxide compounds by means of a passification process, and the stabilized uranium oxide compounds produced therefrom. The method is es... | 11/19/1991 |
| 5015422 | UO2 pellet fabrication process Making uranium dioxide pellets of controlled grain size by treating 50-500 g/l UO2 F2 with NH3 in a first and a second stages to form (NH4)2 U2 O7 precipitate, wherein the NH3 | 05/14/1991 |
| 4996192 | Y-Ba-Cu-O superconductor containing radioactive dopants A polycrystalline Y-Ba-Cu-O superconductor doped with sufficient 235 U and/or 239 Pu atoms is irradiated with thermal neutrons to produce from about 2.5×1014 to about 50×1014 fission events per cubic centimete... | 02/26/1991 |
| 4923639 | Method of processing plutonium and/or uranyl nitrate Method for treating plutonium and/or uranyl nitrate by superheating and concentrating a nitric acid starting solution, characterized by the feature that nitric acid starting solution is concentrated to form a Pu(VI)-and/or U(VI)-containing nitrate melt, i... | 05/08/1990 |
| 4885147 | Process for preparing a large-grained UO2 fuel A process for producing large-grain, low-density UO2 micro-fuel spheres, the micro-fuel spheres having an average grain diameter of at least 5 μm, which comprises: (a) isothermally heating one or more UO2 micro-fuel spheres in a str... | 12/05/1989 |
| 4882100 | Uo2 pellet fabrication process A process of fabricating UO2 pellets comprising the steps of filtering and drying a slurry of ammonium diuranate (ADU) including ammonium fluoride (NH4 F), in order to form ADU powder, and then subjecting the ADU powder to calcining,... | 11/21/1989 |
| 4832924 | Process for producing uranium oxides The present invention provides a process for producing a uranium oxide by dissolving a yellow cake in sulfuric acid or hydrochloric acid, bringing the obtained solution into contact with a chelating resin of diaminocarboxylic acid type and subjecting the ... | 05/23/1989 |
| 4830841 | Conversion of uranium hexafluoride to uranium dioxide The present invention contemplates the conversion of uranium hexafluoride with superheated steam to produce a fine, submicron, uranyl fluoride powder which is agglomerated and densified in a fluidized bed of a uranium oxide material. Thereafter, the agglo... | 05/16/1989 |
