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DE2004834813

Publication Date	2004
Personal Author	Rai, D.; Rao, L.; Clark, S. B.
Page Count	18
Abstract	This proposed research builds on the fundamental data developed under former EMSP project (65368) and seeks to develop additional fundamental data for chromium (Cr) reactions that are not currently available but are essential for the processing of high-level waste (HLW). Our objectives are to study (1) the dissolution of several solid phases (e.g., CrOOH, Cr2O3(c), and Fe and 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.
Keywords	High level radioactive wastes Radioactive waste processing Tanks Chromium Dissolution Radioactive waste disposal Electrolytes Hydroxides Leaching Oxidizers Redox reactions Sludges
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Pacific Northwest National Lab., Richland, WA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200516

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

Speciation, Dissolution, and Redox Reactions of Chromium Relevant to Pretreatment and Separation of High Level-Tank Wastes.
DE2004834813

Publication Date	2004
Personal Author	Rai, D.; Rao, L.; Clark, S. B.
Page Count	18
Abstract	This proposed research builds on the fundamental data developed under former EMSP project (65368) and seeks to develop additional fundamental data for chromium (Cr) reactions that are not currently available but are essential for the processing of high-level waste (HLW). Our objectives are to study (1) the dissolution of several solid phases (e.g., CrOOH, Cr2O3(c), and Fe and 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.
Keywords	High level radioactive wastes Radioactive waste processing Tanks Chromium Dissolution Radioactive waste disposal Electrolytes Hydroxides Leaching Oxidizers Redox reactions Sludges
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Pacific Northwest National Lab., Richland, WA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200516