Leaching behavior of phosphate-bonded ceramic waste forms

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Over the last few years, Argonne National Laboratory has been developing room-temperature-setting chemically bonded phosphate ceramics for solidifying and stabilizing low-level mixed wastes. This technology is crucial for stabilizing waste streams that contain volatile species and off-gas secondary waste streams generated by high-temperature treatment of such wastes. We have developed a magnesium phosphate ceramic to treat mixed wastes such as ash, salts, and cement sludges. Waste forms of surrogate waste streams were fabricated by acid-base reactions between the mixtures of magnesium oxide powders and the wastes, and phosphoric acid or acid phosphate solutions. Dense and hard ceramic waste forms are ... continued below

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12 p.

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Singh, D.; Wagh, A.S.; Jeong, S.Y. & Dorf, M. April 1, 1996.

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Description

Over the last few years, Argonne National Laboratory has been developing room-temperature-setting chemically bonded phosphate ceramics for solidifying and stabilizing low-level mixed wastes. This technology is crucial for stabilizing waste streams that contain volatile species and off-gas secondary waste streams generated by high-temperature treatment of such wastes. We have developed a magnesium phosphate ceramic to treat mixed wastes such as ash, salts, and cement sludges. Waste forms of surrogate waste streams were fabricated by acid-base reactions between the mixtures of magnesium oxide powders and the wastes, and phosphoric acid or acid phosphate solutions. Dense and hard ceramic waste forms are produced in this process. The principal advantage of this technology is that the contaminants are immobilized by both chemical stabilization and subsequent microencapsulation of the reaction products. This paper reports the results of durability studies conducted on waste forms made with ash waste streams spiked with hazardous and radioactive surrogates. Standard leaching tests such as ANS 16.1 and TCLP were conducted on the final waste forms. Fates of the contaminants in the final waste forms were established by electron microscopy. In addition, stability of the waste forms in aqueous environments was evaluated with long-term water-immersion tests.

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12 p.

Notes

INIS; OSTI as DE96009416

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  • 98. annual meeting of the American Ceramic Society, Indianapolis, IN (United States), 14-17 Apr 1996

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  • Other: DE96009416
  • Report No.: ANL/ET/CP--88344
  • Report No.: CONF-9604124--5
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 230386
  • Archival Resource Key: ark:/67531/metadc672844

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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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  • April 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 16, 2015, 12:52 p.m.

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Singh, D.; Wagh, A.S.; Jeong, S.Y. & Dorf, M. Leaching behavior of phosphate-bonded ceramic waste forms, article, April 1, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc672844/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.