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CHEMICAL REACTIVITY OF URANIUM TRIOXIDE. PART 1. CONVERSION TO U$sub 3$$O$$sub 8$, UO$sub 2$ AND UF$sub 4$

Journal Article · · Transactions of the Faraday Society (England) Superseded by J. Chem. Soc., Faraday Trans., I and II
DOI:https://doi.org/10.1039/tf9625801590· OSTI ID:4794038
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A kinetic study was made of the reduction of UO/sub 3/ to UO/sub 2/ by hydrogen and carbon monoxide and of the conversion of UO/sub 2/ to UF/sub 4/ by hydrogen fluoride. The reduction reaction is an interfacial reaction proceeding via the UO/sub 2.6/ phase, with CO reacting more readily than H/sub 2/. The reactivity of UO/sub 2/ toward HP is a function of its surface area which increases with (a) lower reduction temperature, (b) the presence of sulfate impurity in the UO/sub 3/. The de composition of UO/sub 3/ to U/sub 3/O/sub 8/ and conversion of the latter UO/sub 2/ and UF/sub 4/ was also studied and the kinetics are reported. The rate of hydrofluorination of UO/sub 2/ prepared by this route is dependent upon the UO3 decomposition temperature rather than upon the U/sub 3/O/sub 8/ reduction temperature. It is shown that for UO/sub 2/ to be reactive toward HF it must possess both an adequate surface area (>2m/sub 2/g) and sufficient internal porosity to accommodate the volume increase associated wlth conversion to UF/sub 4/. Some experiments on the interaction of UO/sub 2/ single crystals with HF are also reported. (auth)
Research Organization:
Atomic Energy Research Establishment, Harwell, Berks, Eng.
NSA Number:
NSA-16-029031
OSTI ID:
4794038
Journal Information:
Transactions of the Faraday Society (England) Superseded by J. Chem. Soc., Faraday Trans., I and II, Journal Name: Transactions of the Faraday Society (England) Superseded by J. Chem. Soc., Faraday Trans., I and II Vol. Vol: 58; ISSN TFSOA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

CARBON MONOXIDE
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
EXPANSION
FLUORINATION
HYDROFLUORIC ACID
HYDROGEN
IMPURITIES
MONOCRYSTALS
POROSITY
PYROLYSIS
REACTION KINETICS
REDUCTION
SULFATES
SURFACE AREA
SURFACES
TEMPERATURE
TESTING
U3O8
URANIUM DIOXIDE
URANIUM TETRAFLUORIDE
URANIUM TRIOXIDE
VOLUME