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Title: Speciation, Dissolution, and Redox Reactions of Chromium Relevant to Pretreatment and Separation of High-Level Tank Wastes

Abstract

Chromium, one of the problematic elements in tank sludges, is considered the most important constituent in defining the total volume of high-level waste (HLW) glass. This proposed research seeks to develop fundamental data for Cr reactions that are not currently available but are essential for developing pretreatment processes for removing Cr from HLW sludges. Our objectives are to study (1) the dissolution of several solid phases (e.g., CrOOH, Cr2O3(c), and (Fe,Cr) binary hydroxides, identified to be important from sludge leaching studies) in highly alkaline solutions and in the presence of other electrolytes (e.g., carbonate, phosphate, sulfate, nitrite), and (2) the effect of the nature of Cr solid phases and aqueous species on their redox reactivity with a variety of potential oxidants (e.g., O2 and ferrate). This information will provide critical support for developing enhanced pretreatment strategies for removing Cr from HLW and will achieve a major cost reduction in HLW disposal.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab., Richland, WA; Lawrence Berkeley National Lab., Berkeley, CA; Washington State University, Pullman, WA (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
834814
Report Number(s):
EMSP-81896-2003
R&D Project: EMSP 81896; TRN: US200433%%385
DOE Contract Number:  
FG07-01ER14930
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jun 2003
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; CHROMIUM; DISSOLUTION; ELECTROLYTES; GLASS; HYDROXIDES; LEACHING; OXIDIZERS; REDOX REACTIONS; SLUDGES; TANKS; WASTES

Citation Formats

Rai, Dhanpat, Rao, Linfeng, and Clark, Sue B. Speciation, Dissolution, and Redox Reactions of Chromium Relevant to Pretreatment and Separation of High-Level Tank Wastes. United States: N. p., 2003. Web. doi:10.2172/834814.
Rai, Dhanpat, Rao, Linfeng, & Clark, Sue B. Speciation, Dissolution, and Redox Reactions of Chromium Relevant to Pretreatment and Separation of High-Level Tank Wastes. United States. https://doi.org/10.2172/834814
Rai, Dhanpat, Rao, Linfeng, and Clark, Sue B. 2003. "Speciation, Dissolution, and Redox Reactions of Chromium Relevant to Pretreatment and Separation of High-Level Tank Wastes". United States. https://doi.org/10.2172/834814. https://www.osti.gov/servlets/purl/834814.
@article{osti_834814,
title = {Speciation, Dissolution, and Redox Reactions of Chromium Relevant to Pretreatment and Separation of High-Level Tank Wastes},
author = {Rai, Dhanpat and Rao, Linfeng and Clark, Sue B},
abstractNote = {Chromium, one of the problematic elements in tank sludges, is considered the most important constituent in defining the total volume of high-level waste (HLW) glass. This proposed research seeks to develop fundamental data for Cr reactions that are not currently available but are essential for developing pretreatment processes for removing Cr from HLW sludges. Our objectives are to study (1) the dissolution of several solid phases (e.g., CrOOH, Cr2O3(c), and (Fe,Cr) binary hydroxides, identified to be important from sludge leaching studies) in highly alkaline solutions and in the presence of other electrolytes (e.g., carbonate, phosphate, sulfate, nitrite), and (2) the effect of the nature of Cr solid phases and aqueous species on their redox reactivity with a variety of potential oxidants (e.g., O2 and ferrate). This information will provide critical support for developing enhanced pretreatment strategies for removing Cr from HLW and will achieve a major cost reduction in HLW disposal.},
doi = {10.2172/834814},
url = {https://www.osti.gov/biblio/834814}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {6}
}