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Title: Metal surface decontamination using 1-hydroxyethane-1,1-diphosphonic acid

Abstract

Substituted-ethane diphosphonic acids are an interesting moiety of organic acids because they display particularly favorable chemical characteristics toward the selective dissolution of metal oxides. In recent years, these systems have been studied to develop a cradle-to-grave process for the decontamination of ferrous metals typical of the nuclear power industry. This paper expands the understanding of this system to the dissolution of ferrous oxides found on corroded metals of nuclear facilities. It is found that pure iron oxides such as magnetite (Fe{sub 3}O{sub 4}) and hematite (Fe{sub 2}O{sub 3}) dissolve quickly (<1 h) using 0.5 M 1-hydroxyethane-1,1-diphosphonic acid (HEDPA) and a strong reducing agent; the oxides with slower kinetics are the spinel structures, such as the nickel ferrites (NiOFe{sub 2}O{sub 3}), which dissolved very slowly in the foregoing solution. These results were confirmed in bench-scale tests on actual carbon steel and radioactively contaminated stainless steel samples. The decontamination of actual stainless steel from a nuclear reactor vessel required high concentrations of both HEDPA and reducing agent. Methods for treating the spent HEDPA solution are discussed.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20030426
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Journal Article
Journal Name:
Nuclear Technology
Additional Journal Information:
Journal Volume: 130; Journal Issue: 2; Other Information: PBD: May 2000; Journal ID: ISSN 0029-5450
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; REACTOR DECOMMISSIONING; DECONTAMINATION; REACTOR MAINTENANCE; BWR TYPE REACTORS; PWR TYPE REACTORS; REACTOR COOLING SYSTEMS; SCALING; OXIDES; PHOSPHONIC ACIDS

Citation Formats

Kaminski, M.D., Nunez, L., Purohit, A., and Lewandowski, M. Metal surface decontamination using 1-hydroxyethane-1,1-diphosphonic acid. United States: N. p., 2000. Web.
Kaminski, M.D., Nunez, L., Purohit, A., & Lewandowski, M. Metal surface decontamination using 1-hydroxyethane-1,1-diphosphonic acid. United States.
Kaminski, M.D., Nunez, L., Purohit, A., and Lewandowski, M. Mon . "Metal surface decontamination using 1-hydroxyethane-1,1-diphosphonic acid". United States.
@article{osti_20030426,
title = {Metal surface decontamination using 1-hydroxyethane-1,1-diphosphonic acid},
author = {Kaminski, M.D. and Nunez, L. and Purohit, A. and Lewandowski, M.},
abstractNote = {Substituted-ethane diphosphonic acids are an interesting moiety of organic acids because they display particularly favorable chemical characteristics toward the selective dissolution of metal oxides. In recent years, these systems have been studied to develop a cradle-to-grave process for the decontamination of ferrous metals typical of the nuclear power industry. This paper expands the understanding of this system to the dissolution of ferrous oxides found on corroded metals of nuclear facilities. It is found that pure iron oxides such as magnetite (Fe{sub 3}O{sub 4}) and hematite (Fe{sub 2}O{sub 3}) dissolve quickly (<1 h) using 0.5 M 1-hydroxyethane-1,1-diphosphonic acid (HEDPA) and a strong reducing agent; the oxides with slower kinetics are the spinel structures, such as the nickel ferrites (NiOFe{sub 2}O{sub 3}), which dissolved very slowly in the foregoing solution. These results were confirmed in bench-scale tests on actual carbon steel and radioactively contaminated stainless steel samples. The decontamination of actual stainless steel from a nuclear reactor vessel required high concentrations of both HEDPA and reducing agent. Methods for treating the spent HEDPA solution are discussed.},
doi = {},
journal = {Nuclear Technology},
issn = {0029-5450},
number = 2,
volume = 130,
place = {United States},
year = {2000},
month = {5}
}