Characterization of actinides in simulated alkaline tank waste sludges and leach solutions

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Current plans call for an alkaline scrub of actinide-bearing sludges in the Hanford Waste tanks prior to their incorporation in glass waste forms. Though it is assumed that actinides will remain in the sludge phase during this procedure, this assumption is based on insufficient supporting thermodynamic and kinetic data. In this project the authors will investigate the fundamental chemistry of actinides in strongly alkaline solution and solid phases to strengthen the foundation and identify potential limitations of this approach. They will focus on the characterization of the leaching of actinides from simulated BiPO{sub 4}, REDOX, and PUREX sludges, the identification ... continued below

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6 pages

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Nash, K. L.; Rao, L.; Jensen, M. P. & Bond, A. H. April 21, 2000.

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  • Argonne National Laboratory
    Publisher Info: Argonne National Lab., Argonne, IL (United States)
    Place of Publication: Argonne, Illinois

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Description

Current plans call for an alkaline scrub of actinide-bearing sludges in the Hanford Waste tanks prior to their incorporation in glass waste forms. Though it is assumed that actinides will remain in the sludge phase during this procedure, this assumption is based on insufficient supporting thermodynamic and kinetic data. In this project the authors will investigate the fundamental chemistry of actinides in strongly alkaline solution and solid phases to strengthen the foundation and identify potential limitations of this approach. They will focus on the characterization of the leaching of actinides from simulated BiPO{sub 4}, REDOX, and PUREX sludges, the identification of actinide mineral phases in the sludge simulants, and the possible solubilization of actinides by complexation and radiolysis effects. This program will provide new fundamental information on the chemical behavior and speciation of uranium, neptunium, plutonium, and americium in simulated alkaline tank waste sludges and alkaline scrub liquors. Sludge simulants will be prepared from the appropriate matrix components using published data for guidance. Actinide ions will be introduced in the oxidation states pertinent to process conditions. The authors will characterize the speciation of the actinides in the sludges using a variety of techniques. In parallel studies, they will address the chemistry of actinide ions in alkaline solutions, principally those containing chelating agents. The third critical element of this research will be to assess the impact of radiolysis on actinide behavior. By correlating actinide speciation in the solid and solution phases with sludge composition, it will be possible to predict conditions favoring mobilization (or immobilization) of actinide ions during sludge washing. The new information will increase predictability of actinide behavior during tank sludge washing, and so contribute to minimization of the volume of high level waste created.

Physical Description

6 pages

Source

  • Other Information: PBD: 21 Apr 2000

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  • Report No.: ANL/CHM/RP-101703
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/755844 | External Link
  • Office of Scientific & Technical Information Report Number: 755844
  • Archival Resource Key: ark:/67531/metadc704152

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  • April 21, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • March 30, 2016, 12:16 p.m.

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Nash, K. L.; Rao, L.; Jensen, M. P. & Bond, A. H. Characterization of actinides in simulated alkaline tank waste sludges and leach solutions, report, April 21, 2000; Argonne, Illinois. (digital.library.unt.edu/ark:/67531/metadc704152/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.