Ion Recognition Approach to Volume Reduction of Alkaline Tank Waste by Separation of Sodium Salts

Levitskaia, Tatiana G. ; Lumetta, Gregg J. ; Moyer, Bruce A. ; Bonnesen, Peter V.

Pacific Northwest National Laboratory (U.S.)

关键词: Sodium Nitrates;    Feedback;    12 Management Of Radioactive Wastes, And Non-Radioactive Wastes From Nuclear Facilities;    Sodium;    Solvation;   

DOI  :  10.2172/893227
RP-ID  :  EMSP-81935-2005
RP-ID  :  None
RP-ID  :  893227

美国|英语

来源: UNT Digital Library

【 摘 要 】

The purpose of this research involving collaboration between Oak Ridge National Laboratory (ORNL) and Pacific Northwest National Laboratory (PNNL) is to explore new approaches to the separation of sodium hydroxide, sodium nitrate, and other sodium salts from high-level alkaline tank waste. The principal potential benefit is a major reduction in disposed waste volume, obviating the building of expensive new waste tanks and reducing the costs of low-activity waste immobilization. Principles of ion recognition are being researched toward discovery of liquid-liquid extraction systems that selectively separate sodium hydroxide and sodium nitrate from other waste components. The successful concept of pseudohydroxide extraction using fluorinated alcohols and phenols is being developed at ORNL and PNNL toward a greater understanding of the controlling equilibria, role of solvation, and of synergistic effects involving crown ethers. Synthesis efforts are being directed toward enhanced sodium binding by crown ethers, both neutral and proton-ionizable. Studies with real tank waste at PNNL will provide feedback toward solvent compositions that have promising properties.