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spelling ftosti:oai:osti.gov:7777272 2023-07-30T04:02:56+02:00 Investigation of a hydrazine-free, electrochemical reduction of Pu(IV) in the Purex process Heilgeist, M. Flory, K. Galla, U. Schieder, H. 2017-11-29 application/pdf http://www.osti.gov/servlets/purl/7777272 https://www.osti.gov/biblio/7777272 https://doi.org/10.2172/7777272 unknown http://www.osti.gov/servlets/purl/7777272 https://www.osti.gov/biblio/7777272 https://doi.org/10.2172/7777272 doi:10.2172/7777272 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY; HYDRAZINE; COMPARATIVE EVALUATIONS; NITRIC OXIDE; NITROUS ACID; PLUTONIUM; REDUCTION; REDUCING AGENTS; CHEMICAL REACTION KINETICS; ELECTROCHEMISTRY; ELECTROLYSIS; OXIDATION; PH VALUE; PUREX PROCESS; REDOX REACTIONS; TEMPERATURE DEPENDENCE; URANIUM; UREA; VALENCE; ACTINIDES; AMIDES; CARBONIC ACID DERIVATIVES; CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; ELEMENTS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; KINETICS; LYSIS; METALS; NITROGEN COMPOUNDS; NITROGEN OXIDES; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; REACTION KINETICS; REPROCESSING; SEPARATION PROCESSES; TRANSURANIUM ELEMENTS 2017 ftosti https://doi.org/10.2172/7777272 2023-07-11T10:56:34Z In the Purex process for reprocessing spent fuel elements, separation of uranium and plutonium is attained through a valency adjustment of Pu(III). This report describes the use of electrochemical methods in the absence of hydrazine for the adjustment of Pu(III), in place of nitrous oxide itself (or nitric oxide) as a reducing agent. This was tried at low acid concentrations in which nitrous acid no longer functions oxidatively. The following factors and effects were investigated: nitric acid concentration, current density, temperature, uranium content, surface area of electrodes, and the effect of very low hydrazine concentrations. In addition, the reoxidation properties of completely reduced Pu(III)-containing solutions were investigated. Results of laboratory experiments on purely aqueous systems were compared with those from TBP/dodecane/HNO/sub 3/ systems in a pulse column. Information gained from laboratory experiments on U/Pu separation in the absence of hydrazine was confirmed in pulse-column experiments. Other/Unknown Material Carbonic acid SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
institution Open Polar
collection SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
op_collection_id ftosti
language unknown
topic 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC
ORGANIC
PHYSICAL
AND ANALYTICAL CHEMISTRY; HYDRAZINE; COMPARATIVE EVALUATIONS; NITRIC OXIDE; NITROUS ACID; PLUTONIUM; REDUCTION; REDUCING AGENTS; CHEMICAL REACTION KINETICS; ELECTROCHEMISTRY; ELECTROLYSIS; OXIDATION; PH VALUE; PUREX PROCESS; REDOX REACTIONS; TEMPERATURE DEPENDENCE; URANIUM; UREA; VALENCE; ACTINIDES; AMIDES; CARBONIC ACID DERIVATIVES; CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; ELEMENTS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; KINETICS; LYSIS; METALS; NITROGEN COMPOUNDS; NITROGEN OXIDES; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; REACTION KINETICS; REPROCESSING; SEPARATION PROCESSES; TRANSURANIUM ELEMENTS
spellingShingle 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC
ORGANIC
PHYSICAL
AND ANALYTICAL CHEMISTRY; HYDRAZINE; COMPARATIVE EVALUATIONS; NITRIC OXIDE; NITROUS ACID; PLUTONIUM; REDUCTION; REDUCING AGENTS; CHEMICAL REACTION KINETICS; ELECTROCHEMISTRY; ELECTROLYSIS; OXIDATION; PH VALUE; PUREX PROCESS; REDOX REACTIONS; TEMPERATURE DEPENDENCE; URANIUM; UREA; VALENCE; ACTINIDES; AMIDES; CARBONIC ACID DERIVATIVES; CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; ELEMENTS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; KINETICS; LYSIS; METALS; NITROGEN COMPOUNDS; NITROGEN OXIDES; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; REACTION KINETICS; REPROCESSING; SEPARATION PROCESSES; TRANSURANIUM ELEMENTS
Heilgeist, M.
Flory, K.
Galla, U.
Schieder, H.
Investigation of a hydrazine-free, electrochemical reduction of Pu(IV) in the Purex process
topic_facet 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC
ORGANIC
PHYSICAL
AND ANALYTICAL CHEMISTRY; HYDRAZINE; COMPARATIVE EVALUATIONS; NITRIC OXIDE; NITROUS ACID; PLUTONIUM; REDUCTION; REDUCING AGENTS; CHEMICAL REACTION KINETICS; ELECTROCHEMISTRY; ELECTROLYSIS; OXIDATION; PH VALUE; PUREX PROCESS; REDOX REACTIONS; TEMPERATURE DEPENDENCE; URANIUM; UREA; VALENCE; ACTINIDES; AMIDES; CARBONIC ACID DERIVATIVES; CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; ELEMENTS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; KINETICS; LYSIS; METALS; NITROGEN COMPOUNDS; NITROGEN OXIDES; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; REACTION KINETICS; REPROCESSING; SEPARATION PROCESSES; TRANSURANIUM ELEMENTS
description In the Purex process for reprocessing spent fuel elements, separation of uranium and plutonium is attained through a valency adjustment of Pu(III). This report describes the use of electrochemical methods in the absence of hydrazine for the adjustment of Pu(III), in place of nitrous oxide itself (or nitric oxide) as a reducing agent. This was tried at low acid concentrations in which nitrous acid no longer functions oxidatively. The following factors and effects were investigated: nitric acid concentration, current density, temperature, uranium content, surface area of electrodes, and the effect of very low hydrazine concentrations. In addition, the reoxidation properties of completely reduced Pu(III)-containing solutions were investigated. Results of laboratory experiments on purely aqueous systems were compared with those from TBP/dodecane/HNO/sub 3/ systems in a pulse column. Information gained from laboratory experiments on U/Pu separation in the absence of hydrazine was confirmed in pulse-column experiments.
author Heilgeist, M.
Flory, K.
Galla, U.
Schieder, H.
author_facet Heilgeist, M.
Flory, K.
Galla, U.
Schieder, H.
author_sort Heilgeist, M.
title Investigation of a hydrazine-free, electrochemical reduction of Pu(IV) in the Purex process
title_short Investigation of a hydrazine-free, electrochemical reduction of Pu(IV) in the Purex process
title_full Investigation of a hydrazine-free, electrochemical reduction of Pu(IV) in the Purex process
title_fullStr Investigation of a hydrazine-free, electrochemical reduction of Pu(IV) in the Purex process
title_full_unstemmed Investigation of a hydrazine-free, electrochemical reduction of Pu(IV) in the Purex process
title_sort investigation of a hydrazine-free, electrochemical reduction of pu(iv) in the purex process
publishDate 2017
url http://www.osti.gov/servlets/purl/7777272
https://www.osti.gov/biblio/7777272
https://doi.org/10.2172/7777272
genre Carbonic acid
genre_facet Carbonic acid
op_relation http://www.osti.gov/servlets/purl/7777272
https://www.osti.gov/biblio/7777272
https://doi.org/10.2172/7777272
doi:10.2172/7777272
op_doi https://doi.org/10.2172/7777272
_version_ 1772813816484069376