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| Number | Title | Issue Date |
| 7427386 | Processing materials The invention provides a series of techniques for processing uranium containing feed materials such as uranium ores, reprocessed uranium, uranium containing residues and uranium containing spent fuel. The processes described involve fluorination of uranium containin... | 09/23/2008 |
| 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 |
| 7350318 | Continuous thermal treatment of bulk material The invention relates to a device for continuous heat treatment of granulated materials, especially to the crystallization of polymer granulate, such as polyethyleneterephthalate (PET) for example. The device comprises several adjacent fluidization chambers respecti... | 04/01/2008 |
| 7323153 | Reprocessing method by fluoride volatility process using fractional distillation Fluorine or a fluorine compound is subjected to a reaction with a spent oxide fuel to produce fluorides of uranium and plutonium, and recovering the fluorides using a difference in volatility behavior. The method includes steps of: subjecting a mixture of UO2 | 01/29/2008 |
| 7208129 | Reprocessing method by fluoride volatility process using solid-gas separation Fluorine or a fluorine compound is subjected to a reaction with a spent oxide fuel to produce fluorides of uranium and plutonium, and the fluorides are recovered using a difference in volatility behavior. The spent oxide fuel is subjected to a reaction with an HF ga... | 04/24/2007 |
| 7148352 | Method of inhibiting neurotrophin-receptor binding The present invention relates to compositions which inhibit the binding of nerve growth factor to the p75NTR common neurotrophin receptor and methods of use thereof. In one embodiment, the compound which inhibits binding of nerve growth factor to p75... | 12/12/2006 |
| 6960326 | Method of separating uranium from irradiated nuclear fuel The invention provides a method of separating uranium from at least fission products in irradiated nuclear fuel, said method comprising reacting said irradiated nuclear fuel with a solution of ammonium fluoride in hydrogen fluoride fluorinating said reacted irradiat... | 11/01/2005 |
| 6761862 | Method of determining the extent to which a nickel structure has been attached by a fluorine-containing gas The method of determining the extent to which a nickel structure has been attacked by a halogen containing gas to which it has been exposed which comprises preparing a quantity of water substantially free from dissolved oxygen, passing ammonia gas through a cuprammo... | 07/13/2004 |
| 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 |
| 5826163 | Removal of technetium impurities from uranium hexafluoride Processes for the removal of technetium from contaminated uranium hexafluoride containing technetium, typically as technetium-99 (99 Tc) in nominal chemical forms are provided. The processes involve contacting the contaminated liquefied uranium... | 10/20/1998 |
| 5787353 | Process for the in situ recovery of chemical values from UF 6 gaseous diffusion process equipment A process for the recovery of chemical values, particularly uranium, nickel and/or radionuclides from process equipment theretofore employed in a uranium hexafluoride isotope enrichment cascade. Preferably, the process is carried out, in situ, at subatmos... | 07/28/1998 |
| 5753162 | Method for in-situ environment sensitive sealing and/or product controlling A single furnace loading cycle method for sintering at least one product. The method comprises the steps of placing at least one product into a ventable/sealable box, which box is placed inside a furnace. The box is vented inside the furnace at a first te... | 05/19/1998 |
| 5744116 | Reaction of uranium fluorides with mineral acids to recover hydrogen fluoride Uranium fluoride compounds, in which the uranium is preferably present in the tetravalent or higher valency state, are reacted with a strong mineral acid, to yield a gaseous phase of hydrogen fluoride and a precipitate that is a uranium salt of the minera... | 04/28/1998 |
| 5723837 | Uranium hexafluoride purification A method of purifying a UF6 gas stream which comprises irradiating the UF6 gas stream with laser radiation in a vessel in order to selectively convert fluoride impurities in the gas stream to involatile products, removing the purifie... | 03/03/1998 |
| 5640709 | Method and apparatus for producing a product in a regenerator furnace from impure waste containing a non-gasifiable impurity An apparatus and method for producing a product, such as hydrogen halide gas or sulfuric acid, in a regenerator furnace subsystem from a waste containing a non-gasifiable impurity. The method of the invention includes directing a waste, containing a non-g... | 06/17/1997 |
| 5505927 | Production of uranium hexafluoride A process for producing uranium hexafluoride comprises bringing fluorine gas into contact with reactive particles comprising uranium metal, as well as with non-reactive particles which are substantially inert and which are in contact with the reactive par... | 04/09/1996 |
| 5492462 | Method for the production of low enriched uranium hexafluoride from highly-enriched metallic uranium A method for the production of low enriched uranium hexafluoride from highly enriched metallic uranium consists of oxidizing metallic uranium highly enriched in uranium-235 at a temperature of 700°-1100° C. and fluorinating with elementary fluorine at ... | 02/20/1996 |
| 5431891 | Process for the recovery and purification of a metal alloy based on highly enriched uranium Process for the treatment of a metal alloy based on uranium, generally in highly enriched form and other metallic elements, comprising a fluorination treatment with the aid of at least one fluorine-containing gas, optionally with an intermediate fluorinat... | 07/11/1995 |
| 5340447 | Process for the selective electrofluorination of alloys or metallic mixtures based on uranium A process for the selective electrofluorination of metallic alloy based on U characterized by effecting a selective anodic reaction on at least one of the components of the alloy by means of a controlled anodic voltage applied to the alloy in a bath of mo... | 08/23/1994 |
| 5284605 | Method of treating gas based on electrolytic fluorine containing uranium compounds A method of treating a gas based on fluorine and containing hydrofluoric acid, and which may optionally contain condensable gaseous compounds, especially uranium compounds, and non-condensable gases. The gas is refrigerated to obtain a gaseous component c... | 02/08/1994 |
| 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 |
| 5207999 | Generation of fluorine via thermal plasma decomposition of metal fluoride A compound MFn, where M is a metal and n is the valency of the metal and has a value between 1 and 6, is subjected to a thermal plasma at a temperature in excess of 3000 K to dissociate it into the metal and fluorine. Also present in the reacto... | 05/04/1993 |
| 4963294 | Method of preparing uranium dioxide powder from uranium hexafluoride A method of fabricating uranium dioxide (UO2) powder from uranium hexafluoride (UF6) is disclosed, which comprises (1) reacting UF6 gas with steam with controlling the temperature of reaction between said UF6 gas and... | 10/16/1990 |
| 4960581 | Method for preparing gaseous metallic fluoride The method for preparing a gaseous metallic floride is here disclosed which comprises reacting a metal or its oxide with a fluorine gas or nitrogen trifluoride gas, the aforesaid method being characterized by comprising the steps of mixing the metal or it... | 10/02/1990 |
| 4948478 | Uranium isotope separation process following the molecular laser process The process of the present invention provides a gas steam of a mixture of UF6 isotopes and an inert gas, e.g. nitrogen, which is adiabatically expanded through a nozzle into a laser light excitation zone and photodissociated to form U-235 enric... | 08/14/1990 |
| 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 |
| 4873031 | Method of controlling the crystal grain size of uranium dioxide pellet A method of controlling the crystal grain size of UO2 pellets is disclosed, which comprises (1) providing an aqueous uranyl solution which is free of hydrofluoric acid and nitric acid and which contains uranyl fluoride (UO2 F2)... | 10/10/1989 |
| 4859441 | Process for the preparation of uranium tetrafluoride by the reduction of uranium hexafluoride and sulphur fluorides produced by this process A process for the preparation of uranium tetrafluoride by reduction of gaseous uranium hexafluoride using: (1) sulphur vapor with a minimum of halogen and/or a halide, chosen from among Cl2, Br2, S2 F2, SCL... | 08/22/1989 |
| 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 |
| 4783322 | Method for fluorination of actinide fluorides and oxyfluorides thereof using O2 F2 Method for fluorination of actinides and fluorides and oxyfluorides thereof using O2 F2 which generates actinide hexafluorides, and for removal of actinides and compounds thereof from surfaces upon which they appear as unwanted depos... | 11/08/1988 |
| 4742009 | Method for monitoring stack gases for uranium activity A method for monitoring the stack gases of a purge cascade of a gaseous diffusion plant for uranium activity. A sample stream is taken from the stack gases and contacted with a volume of moisture-laden air for converting trace levels of uranium hexafluori... | 05/03/1988 |
| 4724127 | Method for recovery of actinides from refractory oxides thereof using O.sub. F2 Method for recovery of actinides from nuclear waste material containing sintered and other oxides thereof using O2 F2 to generate the hexafluorides of the actinides present therein. The fluorinating agent, O2 F2... | 02/09/1988 |
| 4704261 | Method for fluorination of uranium oxide Highly pure uranium hexafluoride is made from uranium oxide and fluorine. The uranium oxide, which includes UO3, UO2, U3 O8 and mixtures thereof, is introduced together with a small amount of a fluorine-reactive... | 11/03/1987 |
| 4687605 | Manufacturing automation system for nuclear fuel rod production An automated fuel rod production system includes a radioactive powder fabrication and processing stage, a pellet fabrication stage, a pellet processing stage, a tube preparation stage and a fuel rod fabrication and inspection stage, all of which provide a... | 08/18/1987 |
| 4555318 | Removal of fluoride impurities from UF6 gas A method of purifying a UF6 gas stream containing one or more metal fluoride impurities composed of a transuranic metal, transition metal or mixtures thereof, is carried out by contacting the gas stream with a bed of UF5 in a reactio... | 11/26/1985 |
| 4544531 | Uranium hexafluoride purification process A process for the purification of uranium hexafluoride containing traces of neptunium fluoride and/or plutonium fluoride, wherein the uranium hexafluoride to be purified is contacted with a metal fluoride chosen from the group including lead fluoride PbF | 10/01/1985 |
| 4518569 | Process for cleaning the inner walls of a reactor A physico-chemical cleaning process for the inner walls of a reactor which serves to maintain these walls in a state close to their main initial characteristics necessitated by a fluorination reaction, said characteristics being degraded by the deposition... | 05/21/1985 |
| 4434139 | Method for removing adhering or dust-like deposits in systems handling uranium hexafluoride A process for removing adhering or dust-like deposits in an apparatus which handles uranium hexafluoride. The process includes the steps of: (a) reacting the deposits with a gaseous boron halogenide other than boron trifluoride, to form at least one uranium ha... | 02/28/1984 |
| 4430307 | Method for separating the isotopes of an element in particular of a metal having a high atomic weight The invention relates to a process and apparatus for the separation of the isotopes of a body, and particularly of a heavy metal. The process comprises the preparation of a tension-active compound of said body, the solution of this compound in a liquid ha... | 02/07/1984 |
