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Preparation Of Dense Uranium Dioxide Particles From Uranium Hexafluoride In A Fluidized Bed
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Book Synopsis Preparation of Dense Uranium Dioxide Particles from Uranium Hexafluoride in a Fluidized Bed by :
Download or read book Preparation of Dense Uranium Dioxide Particles from Uranium Hexafluoride in a Fluidized Bed written by and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A fluid-bed method was developed for the direct preparation from uranium hexafluoride of dense, spheroidal uranium dioxide particles for dispersion and packed fuel element applications. The uranium hexafluoride is reacted with mixtures of steam and hydrogen in a bed of uranium dioxide maintained at 650 to 700 deg C, the solid reaction products depositing as a dense layer on the surface of the bed particles. The operating procedure involves alternating periods of uranium hexafluoride feed wi h periods of fluoride cleanup when only steam and hydrogen are fed. Uranium dioxide particles in the size range -- 16 + 140 mesh and having densities of 9.5 g/cc and 9.75 g/cc (up to 89% of theoretical density) were produced at 650 deg C and 700 deg C, respectively, using a uranium hexafluoride feed rate of 25 g/min STA44 lb uranium/(hr)(sq ft reactor cross section)!. The average residual fluoride content of the uranium dioxide was about 300 ppm. The densest material was obtained when 0.75 to 1.4 times the stoichiometric steam requirement (based on the reaction UF/sub 6/ + 2H/sub 2/O + H/sub 2/ yields UO/sub 2/ + 6HF was used. The effect on product density of other process variables such as uranium hexafluoride feed rate, hydrogen concentration, bed height, and duration of hexafluoride feed period was also determined. Further densification of the material to 10.4 to 10.6 g/cc, up to 96.5% of theoretical density, and reduction of the fluoride content to about 5 ppm was achieved by sintering in hydrogen at about 1700 deg C for 2.5 hours. (auth).
Book Synopsis Engineering Development of Fluid-bed Fluoride Volatility Processes by : Irving E. Knudsen
Download or read book Engineering Development of Fluid-bed Fluoride Volatility Processes written by Irving E. Knudsen and published by . This book was released on 1964 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fluid-bed process for the preparation of dense, spheroidal uranium dioxide particles directly from uranium hexafluoride for dispersion and compacted fuel element applications has been developed. In the process, a uranium hexafluoride is reacted with mixtures of steam and hydrogen in a bed of uranium dioxide fluidized by the reactant gases and maintained at 650 to 700 degrees C. The solid reaction products deposit as a dense layer on the surface of the bed particles. The operating procedure involves alternating periods of uranium hexafluoride feed periods of fluoride cleanup when only steam and hydrogen are fed. Product is withdrawn at the end of each cleanup period.
Book Synopsis Preparation and Processing of Particulate Nuclear Fuels by :
Download or read book Preparation and Processing of Particulate Nuclear Fuels written by and published by . This book was released on 1964 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Fluid-bed Process for the Direct Conversion of Uranium Hexfloride to Uranium Dioxide by : I. E. Knudsen
Download or read book A Fluid-bed Process for the Direct Conversion of Uranium Hexfloride to Uranium Dioxide written by I. E. Knudsen and published by . This book was released on 1963 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new, dry process for the production of uranium dioxide powder from uranium hexafluoride by fluidization and particle-coating techniques was developed. The process involves direct conversion of uranium hexafluoride to a solid, UO2F2, by hydrolysis with steam and the reduction of the UO2F2 to the dioxide by reaction with was carried out in 3-in.-diameter Monel reactors.
Book Synopsis Preliminary Report on Conversion of Uranium Hexafluoride to Uranium Dioxide in a One-step Fluid-bed Process by : I. E. Knudsen
Download or read book Preliminary Report on Conversion of Uranium Hexafluoride to Uranium Dioxide in a One-step Fluid-bed Process written by I. E. Knudsen and published by . This book was released on 1959 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A one-step, continuous, fluid-bed process for the conversion of uranium hexafluoride to uranium dioxide was successfully carried out in preliminary experiments in a 1 1/2-inch-diameter Monel reactor. Hydrogen and steam were used for simultaneous reduction and pyrohydrolysis reactions carried out at 600 deg C, resulting in the formation of a dense coating of dioxide on the starting bed of uranium dioxide. The effects of uranium hexafluoride feed rate and reactant excesses on conversion were investigated. Results of fluid-bed steam pyrohydrolysis runs on uranium tetrafluoride are also presented.
Book Synopsis The Preparation of Uranium Hexafluoride from Uranium Ores and Concentrates by Fluoride Volatility Processes by : Earl W. Mautz
Download or read book The Preparation of Uranium Hexafluoride from Uranium Ores and Concentrates by Fluoride Volatility Processes written by Earl W. Mautz and published by . This book was released on 1958 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A FLUID-BED PROCESS FOR THE DIRECT CONVERSION OF URANIUM HEXAFLUORIDE TO URANIUM DIOXIDE. by :
Download or read book A FLUID-BED PROCESS FOR THE DIRECT CONVERSION OF URANIUM HEXAFLUORIDE TO URANIUM DIOXIDE. written by and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new, dry process for the production of UO2 powder from UF6 by fluidization and particle-coating techniques was developed. The process involves direct conversion of UF6 to a solid, UO2F2, by hydrolysis with steam and the reduction of the UO2F2 to the dioxide by reaction with was carried out in 3-in.-dia. Monel reactors. In continuing studies, dense, spheroidal UO2 particles in the range --20 +200 mesh are being prepared. A simultaneous (steam and H2) reaction procedure at temperatures up to 7OO deg C is being used. Particle densities ranged to 9.75g/ cc or about 89% of theoretical. Sintering in H2 at about 1700 deg C for 2.5 hr gave final densities of 10.4 to 16.6 g/cc or up to about 96.5% of theoretical density. (auth).
Book Synopsis Fluid-Bed Conversion of Uranium Tetrafluoride to Uranium Hexafluoride by : G. J. Vogel
Download or read book Fluid-Bed Conversion of Uranium Tetrafluoride to Uranium Hexafluoride written by G. J. Vogel and published by . This book was released on 1959 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments conducted in a 2 1/2-inch diameter reactor have demonstrated that the continuous fluorination of uranium tetrafluoride to hexafluoride with elemental fluorine in a fluidized bed is possible. Practicable fluorine efficiencies and conversion rates were attained with good temperature control in experiments with refined uranium tetrafluoride. Runs made with crude uranium tetrafluoride, derived from the reduction and hydro-fluorination of ore concentrates produced by the acid-leach process, indicated that these also can be processed at satisfactory rates and efficiencies. Uranium tetrafluoride derived from carbonate-leached ore concentrate gave a lower production rate and was more difficult to process because of sintering tendencies.
Book Synopsis Meeting on Characterization of Uranium Dioxide by : Oak Ridge National Laboratory
Download or read book Meeting on Characterization of Uranium Dioxide written by Oak Ridge National Laboratory and published by . This book was released on 1961 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973-04 with total page 1508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Preparation of Uranium Dioxide Crystals by : R. J. Bard
Download or read book The Preparation of Uranium Dioxide Crystals written by R. J. Bard and published by . This book was released on 1957 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preparation of Minus 10 Micron Dense UO2 by :
Download or read book Preparation of Minus 10 Micron Dense UO2 written by and published by . This book was released on 1961 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1967 with total page 1388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Process for the Recovery of Uranium from Nuclear Fuel Elements Using Fluid-bed Drying and Volatility Techniques by : N. Levitz
Download or read book A Process for the Recovery of Uranium from Nuclear Fuel Elements Using Fluid-bed Drying and Volatility Techniques written by N. Levitz and published by . This book was released on 1961 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: A process scheme for the recovery of uranium from fuel elements has been developed. The scheme combines continuous fluid-bed drying and fluoride volatility techniques after initial dissolution of the fuel element in the appropriate aqueous system, hence the designation ADF, Aqueous Dry Fluorination Process. The application of this process to the recovery of uranium from highly enriched, low uranium-zirconium alloy plate-type fuels is described.
Book Synopsis Bibliography of Scientific and Industrial Reports by :
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1965-07 with total page 1698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U. S. Government Research and Development Reports by :
Download or read book U. S. Government Research and Development Reports written by and published by . This book was released on 1965 with total page 1776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vibratory Compaction and Swaging of Uranium Dioxide to High Density by : B. A. Webb
Download or read book Vibratory Compaction and Swaging of Uranium Dioxide to High Density written by B. A. Webb and published by . This book was released on 1959 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
