Production of Uranium Dioxide by Flame Denitration and Reduction of Aqueous Uranyl Nitrate PDF Download
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Author: William Henry Hedley
Publisher:
ISBN:
Category : Reduction (Chemistry)
Languages : en
Pages : 54
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Book Description
Author: William Henry Hedley
Publisher:
ISBN:
Category : Reduction (Chemistry)
Languages : en
Pages : 54
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
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The photochemical reduction of uranyl nitrate solutions to tetravalent uranium was investigated as a means of producing uranium dioxide feed for the saltless direct oxide reduction (SDOR) process. At high uranium concentrations, reoxidation of U{sup +4} occurs rapidly. The kinetics of the nitric oxidation of tetravalent uranium depend on the concentrations of hydrogen ion, nitrate ion, nitrous acid, and tetravalent uranium in the same manner as was reported elsewhere for the nitrate oxidation of PU{sup +3}. Reaction rate data were successfully correlated with a mechanism in which nitrogen dioxide is the reactive intermediate. Addition of a nitrous acid scavenger suppresses the reoxidation reaction. An immersion reactor employing a mercury vapor lamp gave reduction times fast enough for routine production usage. Precipitation techniques for conversion of aqueous U(NO3)4 to hydrous UO2 were evaluated. Prolonged dewatering times tended to make the process time consuming. Use of 3- to 4-M aqueous NaOH gave the best dewatering times observed. Reoxidation of the UO2 by water of hydration was encountered, which required the drying process to be carried out under a reducing atmosphere.
Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 1214
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Author:
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ISBN:
Category : Nuclear engineering
Languages : en
Pages : 726
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Author: Nikolaĭ Petrovich Galkin
Publisher:
ISBN:
Category : Uranium
Languages : en
Pages : 230
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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A proposed new processing technique for the production of uranium tetrafluoride from uranyl nitrate solution is described. This technique involves the application of the fluidized-bod principle for the contacting of gases with powdered solids. A new application of fluidization developed at this Laboratory and applied to the denitration of uranyl nitrate to produce uranium trioxide is also described. The purpose of this work is to develop a low-cost, continuous process for the denitration of uranyl nitrate hexahydrate, the reduction of uranium trioxide to uranium dioxide, and the hydrofluorination of uranium dioxide to uranium tetrafluoride. Uranium trioxide and uranium dioxide powders can be satisfactorily fluidized over a wide range of particle sizes. The product is a powder having a high bulk density and satisfactory physical and chemioal properties. Production rates of 100 Ib/hr/ft2 of reactor cross section were demonstrated. Experimental work is continuing to obtain additional information of the effects of operating variables. Experimental work is now underway to determine the optimum hydrofluorination operating oonditions and to estimate the size and number of stages required for the production of specification-grade uranium tetrafluoride. (auth).
Author:
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ISBN:
Category :
Languages : en
Pages : 7
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Author: United States. Patent Office
Publisher:
ISBN:
Category : Patents
Languages : en
Pages : 1616
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Author: Business and Defense Services Administration
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 298
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