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Title: Radioactive Waste Minimization by Electrolytic Extraction and Destruction in a Purex-Truex Actinide Separation System

Abstract

Electrolytic extraction of noble metals from nitric acid media was investigated. The largest deposition yield was obtained for Pd, supported by its large rate constants. Rate constants of RuNO{sup 3+} and ReO{sub 4}{sup -} were, however, smaller than that of Pd{sup 2+}; their yield can be improved under high cathode current supply in lower nitric acid concentration. Rather high apparent activation energy was observed for the deposition of RuNO{sup 3+}. Peculiar masking or synergistic effects in their electrodeposition behaviors might be due to mutual interaction of RuNO{sup 3+}, Pd{sup 2+} with ReO{sub 4}{sup -} in nitric acid solution. Sufficiently different redissolution potentials for deposited metals indicate their fractional recovery by anode processing.Mediatory electrochemical oxidation (MEO) was investigated for the mineralization of waste O{phi}D[iB]CMPO (hereafter CMPO) by burning its bulky hydrocarbon moiety under the existence of various kinds of metal ions. Only Ag{sup 2+/+} offered high-current efficiency up to 75%, fairly exceeding that by direct electrooxidation. Redox coupling characterized by a simple electron transfer, M{sup m+} + ne{sup -} <=> M{sup (m-n)+} provided high E{sup 0}, will act exactly as an active mediator. As for the destruction paths for CMPO by MEO, cleavage between carbonyl C and N of amide moietymore » was of principal importance. The coupling of Co{sup 3+/2+} is also recommended because of hydraulic advantages.« less

Authors:
 [1];  [1]; ;
  1. Japan Nuclear Cycle Development Institute (Japan)
Publication Date:
OSTI Identifier:
20822162
Resource Type:
Journal Article
Journal Name:
Nuclear Technology
Additional Journal Information:
Journal Volume: 130; Journal Issue: 2; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0029-5450
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ACTIVATION ENERGY; CMPO; COBALT IONS; ELECTRODEPOSITION; EXTRACTION; HYDROCARBONS; METALS; NEON IONS; NITRIC ACID; PALLADIUM IONS; RADIOACTIVE WASTES; SILVER IONS; SOLUTIONS; YIELDS

Citation Formats

Ozawa, Masaki, Sano, Yuichi, Ohara, Chisako, and Kishi, Takamichi. Radioactive Waste Minimization by Electrolytic Extraction and Destruction in a Purex-Truex Actinide Separation System. United States: N. p., 2000. Web.
Ozawa, Masaki, Sano, Yuichi, Ohara, Chisako, & Kishi, Takamichi. Radioactive Waste Minimization by Electrolytic Extraction and Destruction in a Purex-Truex Actinide Separation System. United States.
Ozawa, Masaki, Sano, Yuichi, Ohara, Chisako, and Kishi, Takamichi. Mon . "Radioactive Waste Minimization by Electrolytic Extraction and Destruction in a Purex-Truex Actinide Separation System". United States.
@article{osti_20822162,
title = {Radioactive Waste Minimization by Electrolytic Extraction and Destruction in a Purex-Truex Actinide Separation System},
author = {Ozawa, Masaki and Sano, Yuichi and Ohara, Chisako and Kishi, Takamichi},
abstractNote = {Electrolytic extraction of noble metals from nitric acid media was investigated. The largest deposition yield was obtained for Pd, supported by its large rate constants. Rate constants of RuNO{sup 3+} and ReO{sub 4}{sup -} were, however, smaller than that of Pd{sup 2+}; their yield can be improved under high cathode current supply in lower nitric acid concentration. Rather high apparent activation energy was observed for the deposition of RuNO{sup 3+}. Peculiar masking or synergistic effects in their electrodeposition behaviors might be due to mutual interaction of RuNO{sup 3+}, Pd{sup 2+} with ReO{sub 4}{sup -} in nitric acid solution. Sufficiently different redissolution potentials for deposited metals indicate their fractional recovery by anode processing.Mediatory electrochemical oxidation (MEO) was investigated for the mineralization of waste O{phi}D[iB]CMPO (hereafter CMPO) by burning its bulky hydrocarbon moiety under the existence of various kinds of metal ions. Only Ag{sup 2+/+} offered high-current efficiency up to 75%, fairly exceeding that by direct electrooxidation. Redox coupling characterized by a simple electron transfer, M{sup m+} + ne{sup -} <=> M{sup (m-n)+} provided high E{sup 0}, will act exactly as an active mediator. As for the destruction paths for CMPO by MEO, cleavage between carbonyl C and N of amide moiety was of principal importance. The coupling of Co{sup 3+/2+} is also recommended because of hydraulic advantages.},
doi = {},
journal = {Nuclear Technology},
issn = {0029-5450},
number = 2,
volume = 130,
place = {United States},
year = {2000},
month = {5}
}