Reduction of uranium (VI) to uranium (IV) by hydrazine in an aqueous nitric acid-30% tri-n-butyl phosphate (TBP) volume emulsion
Journal Article
·
· Sov. Radiochem. (Engl. Transl.); (United States)
OSTI ID:5431326
Tetravalent uranium which has been stabilized with hydrazine is widely used in the extraction technology of regenerating irradiated nuclear fuel as an agent for reduction of plutonium (IV) to plutonium (III). However, it is well known that in two-phase extraction systems of the type aqueous nitric acid solutions of U(IV)-TBP solutions in inert diluents, the U(IV) is insufficiently stable and is oxidized to U(VI) as a result of reaction with nitrous acid which accumulates in the organic phase. The results of kinetic experiments at various concentration of nitric acid, uranyl nitrate, and hydrazine and at various temperatures show that the order of the reduction of U(VI) to U(IV) in the two-phase extraction system emulsion 30% TBP by volume solution in n-paraffins-aqueous nitric acid is zero with respect to uranium and is unity with respect to hydrazine. Typical kinetic curves for the U(VI)-time dependence are given. The kinetic dependences were analyzed in the time range for about 50% completion of reaction.
- OSTI ID:
- 5431326
- Journal Information:
- Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 29:1; ISSN SVRDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
050800* -- Nuclear Fuels-- Spent Fuels Reprocessing
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
AQUEOUS SOLUTIONS
BUTYL PHOSPHATES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
DISPERSIONS
ENERGY SOURCES
EQUILIBRIUM
ESTERS
EXTRACTION
FUELS
HYDRAZINE
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MATERIALS
MIXTURES
NITRATES
NITRIC ACID
NITROGEN COMPOUNDS
NUCLEAR FUELS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PHOSPHORIC ACID ESTERS
PLUTONIUM COMPOUNDS
PROCESS CONTROL
REACTION KINETICS
REACTOR MATERIALS
REDOX POTENTIAL
REDUCTION
REPROCESSING
SALTING-OUT AGENTS
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SPENT FUELS
TBP
TEMPERATURE DEPENDENCE
TRANSURANIUM COMPOUNDS
URANIUM COMPOUNDS
URANYL COMPOUNDS
URANYL NITRATES
VALENCE
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
AQUEOUS SOLUTIONS
BUTYL PHOSPHATES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
DISPERSIONS
ENERGY SOURCES
EQUILIBRIUM
ESTERS
EXTRACTION
FUELS
HYDRAZINE
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MATERIALS
MIXTURES
NITRATES
NITRIC ACID
NITROGEN COMPOUNDS
NUCLEAR FUELS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PHOSPHORIC ACID ESTERS
PLUTONIUM COMPOUNDS
PROCESS CONTROL
REACTION KINETICS
REACTOR MATERIALS
REDOX POTENTIAL
REDUCTION
REPROCESSING
SALTING-OUT AGENTS
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SPENT FUELS
TBP
TEMPERATURE DEPENDENCE
TRANSURANIUM COMPOUNDS
URANIUM COMPOUNDS
URANYL COMPOUNDS
URANYL NITRATES
VALENCE