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| Number | Title | Issue Date |
| 7824640 | Two step dry UOproduction process utilizing a positive sealing valve means between steps The present invention provides a two-step process for producing nuclear grade, active uranium dioxide (UO2) powder in which the first step comprises reacting uranium hexafluoride (UF6) with steam in a flame reactor to yield uranyl fluoride (UO | 11/02/2010 |
| 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 |
| 7309473 | Method for sulphurizing a UOpowder and method for making nuclear fuel pellets based on UOor mixed oxide (U,Pu)Ooxide with added sulphur Sulphidation method for a UO2 powder, in which said powder is sulfurated by bringing it into contact with a gaseous sulphidation agent. Method for manufacturing nuclear fuel pellets based on uranium oxide, or mixed oxide of uranium and plutonium, f... | 12/18/2007 |
| 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 |
| 6984344 | Production process of a composite nuclear fuel material composed of (U, Pu)Oaggregates dispersed in a UOmatrix The invention relates to a production process of a composite material composed of aggregates of a blend of UO2 and of PuO2 dispersed in a UO2 matrix comprising the steps of dry co-grinding of a UO2 powder and of a PuO... | 01/10/2006 |
| 6960311 | Radiation shielding materials and containers incorporating same An improved radiation shielding material and storage systems for radioactive materials incorporating the same. The PYRolytic Uranium Compound (“PYRUC”) shielding material is preferably formed by heat and/or pressure treatment of a precursor material comprising m... | 11/01/2005 |
| 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 |
| 6656391 | Preparation by spray-drying of a flowable uranium dioxide powder obtained by dry process conversion of UF6 The invention relates to a process for preparing a castable powder of uranium dioxide UO2, for use in the manufacture of MOX fuel. This process comprises the following stages: 1) to prepare an aqueous suspension of a powder of UO2 obtained... | 12/02/2003 |
| 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 |
| 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 solid uranium ... | 10/16/2001 |
| 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 |
| 5955033 | Rotary kiln arrangements A rotary kiln in which reaction is to occur between counterflowing reactants and an injector for a reactant extends into a reaction zone in the kiln. The injector is provided with means for adjusting the temperature of the injected reactant to a temperatu... | 09/21/1999 |
| 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 |
| 5723100 | Uranium oxide production A process for the production of a uranium oxide in which UF6 is converted by reaction with steam into UO2 F2 in a first step and by further reaction of UO2 F2 with steam and/or hydrogen in a second st... | 03/03/1998 |
| 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 chart of FIG. 1 which includes the steps of (a)... | 12/30/1997 |
| 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 |
| 5514306 | Process to reclaim UO2 scrap powder A process for reclaiming scrap UO2 materials yields a high-sinter-density pellet. The scrap is oxidized in a high-temperature furnace to produce U3 O8. The U3 O8 particles from the oxidation furnace a... | 05/07/1996 |
| 5464571 | Once-through nuclear reactor fuel compounds The improved oxide, once-through plutonium fuel compound that can be used for nuclear fission in currently operating light-water reactors and fast reactors has a composition in the range defined by the lines that connect the three compositional points of ... | 11/07/1995 |
| 5419886 | Method for generation of finely divided reactive plutonium oxide powder A method of preparing active, sinterable, finely-divided plutonium oxide (PuO2) powder from plutonium metal is disclosed. The process yields plutonium fissile material which can be easily blended to form a uniformly homogeneous powder for the f... | 05/30/1995 |
| 5417943 | Method for producing UO2 or (U/PU)02 powder A method for producing UO2 or (U/Pu)O2 powder includes obtaining ammonium uranyl carbonate or ammonium uranyl plutonyl carbonate by treating a starting oxide selected from the group consisting of uranium oxide, plutonium oxide and ur... | 05/23/1995 |
| 5411722 | Compact reaction cell for homogenizing and down-blanding highly enriched uranium metal The invention is a specialized reaction cell for converting uranium metal to uranium oxide. In a preferred form, the reaction cell comprises a reaction chamber with increasing diameter along its length (e.g. a cylindrical chamber having a diameter of abou... | 05/02/1995 |
| 5264196 | Multichamber type fluid bed reaction apparatus and method A multichamber type fluid bed reaction apparatus has a series of chambers formed by dividing the fluid bed part and the wind box part thereof with particular walls. Each reaction chamber is supplied with a reaction gas whose composition, flow amount and t... | 11/23/1993 |
| 5139709 | Process for converting uranyl compounds to UO2 via ADU ADU (ammonium diuranate) is prepared in particle form directly by reacting ammonium gas with liquid droplets of atomized uranyl compound solutions. Generation of liquid filtrate is prevented by using concentrated solutions of uranyl compounds as feed solu... | 08/18/1992 |
