Stabilization of lead-rich low-level mixed wastes in chemically bonded phosphate ceramic.

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A chemically bonded magnesium potassium phosphate ceramic has been developed by an acid-base reaction at room temperature, for use in stabilizing U.S. Department of Energy low-level mixed waste streams that include hazardous metals and low-level radioactive elements. Using this ceramic, we solidified, in monolithic waste forms, low-level mixed waste streams containing various levels of PbCl{sub 2} and PbCO{sub 3}. These final waste forms were evaluated for their land disposal suitability. The results showed low open porosity (1.48-4.61 vol.%); hence, low permeability, and higher compression strengths (4310-6734 psi) that were one order of magnitude above that required. The level of lead ... continued below

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12 p.

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Jeong, S.-Y. August 10, 1999.

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Description

A chemically bonded magnesium potassium phosphate ceramic has been developed by an acid-base reaction at room temperature, for use in stabilizing U.S. Department of Energy low-level mixed waste streams that include hazardous metals and low-level radioactive elements. Using this ceramic, we solidified, in monolithic waste forms, low-level mixed waste streams containing various levels of PbCl{sub 2} and PbCO{sub 3}. These final waste forms were evaluated for their land disposal suitability. The results showed low open porosity (1.48-4.61 vol.%); hence, low permeability, and higher compression strengths (4310-6734 psi) that were one order of magnitude above that required. The level of lead in the leachate following the Toxicity Characteristic Leaching Procedure test was reduced from 50,000 to <0.1 ppm. Leachability indexes from the long-term leaching test (ANS 16.1 test) were between 11.9 and 13.6. This excellent lead retention is due to its chemical fixation as insoluble lead phosphate and to physical encapsulation by the phosphate matrix.

Physical Description

12 p.

Notes

INIS; OSTI as DE00011184

Medium: P; Size: 12 pages

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  • 101st Annual Meeting of the American Ceramic Society, Indianapolis, IN (US), 04/25/1999--04/28/1999

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  • Report No.: ANL/ET/CP-97993
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11184
  • Archival Resource Key: ark:/67531/metadc620427

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  • August 10, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 8:09 p.m.

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Jeong, S.-Y. Stabilization of lead-rich low-level mixed wastes in chemically bonded phosphate ceramic., article, August 10, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc620427/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.