Oxidative alkaline dissolution of chromium from Hanford tank sludges: Results of FY 98 studies

One of 80 reports in the series: Fiscal Year 1998 available on this site.

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Description

Plans for disposing of the high-level radioactive wastes at the Hanford Site call for retrieving, pretreating, and finally immobilizing the wastes in a glass matrix. Since the cost for vitrifying and disposing of high-level wastes will be very great, pretreatment processes are being developed to reduce their volume. The baseline method for pretreating Hanford tank sludges is caustic leaching. Earlier studies with Hanford tank-sludge simulants and with actual Hanford tank sludges have indicated that treating water-washed and caustic-leached solids with oxidants can significantly increase the removal of Cr. Permanganate and ozone have been shown to be generally the most rapid ... continued below

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40 p.

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Rapko, B.M. August 1, 1998.

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  • Main Title: Oxidative alkaline dissolution of chromium from Hanford tank sludges: Results of FY 98 studies
  • Series Title: Fiscal Year 1998

Description

Plans for disposing of the high-level radioactive wastes at the Hanford Site call for retrieving, pretreating, and finally immobilizing the wastes in a glass matrix. Since the cost for vitrifying and disposing of high-level wastes will be very great, pretreatment processes are being developed to reduce their volume. The baseline method for pretreating Hanford tank sludges is caustic leaching. Earlier studies with Hanford tank-sludge simulants and with actual Hanford tank sludges have indicated that treating water-washed and caustic-leached solids with oxidants can significantly increase the removal of Cr. Permanganate and ozone have been shown to be generally the most rapid and effective chemical agents for this purpose. The work described in this report continues to examine the effectiveness of solubilizing additional Cr from Hanford tank wastes by oxidation of the water-insoluble solids from tanks U-108, U-109, and SX-108 under alkaline conditions. The current study confirms that permanganate is highly effective at removing chromium from water solids under alkaline conditions, with Cr removals of up to 99+%. Elemental oxygen can also be highly effective, with removals up to 97+%.

Physical Description

40 p.

Notes

INIS; OSTI as DE98058234

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  • Other Information: PBD: Aug 1998

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  • Other: DE98058234
  • Report No.: PNNL--11908
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/290879 | External Link
  • Office of Scientific & Technical Information Report Number: 290879
  • Archival Resource Key: ark:/67531/metadc683976

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 1, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Oct. 20, 2016, 1:17 p.m.

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Rapko, B.M. Oxidative alkaline dissolution of chromium from Hanford tank sludges: Results of FY 98 studies, report, August 1, 1998; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc683976/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.