Speciation, Dissolution, and Redox Reactions of Chromium Relevant to Pretreatment Separation of High-Level Wastes
Conference
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OSTI ID:826363
The objective of this project is to obtain fundamental data necessary to develop pretreatment processes for removing Cr from high-level waste sludges that are highly alkaline and contain multiple concentrated electrolytes. We are determining (1) the solubility of important Cr solid phases and aqueous speciation in a wide range of hydroxide and phosphate concentrations, (2) the effect of pH, temperature, and aging on the nature of Cr solid phases and aqueous speciation, and (3) the effect of the nature of Cr solid phases and aqueous speciation on their redox reactivity. A combination of thermodynamic and spectroscopic analyses is being used to characterize solid and aqueous species. The results on the development of a comprehensive thermodynamic model for the solubility of Cr(OH)3(am) in the Cr(III)-Na+-H+-OH--PO4 3--H2O system applicable to the HLW conditions along with the role aqueous speciation plays in oxidative dissolution of Cr(OH)3(am) will be presented.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA; Lawrence Berkeley National Lab., CA; Washington State University (US)
- Sponsoring Organization:
- USDOE Office of Science (SC) (US)
- OSTI ID:
- 826363
- Country of Publication:
- United States
- Language:
- English
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