Modified phosphate ceramics for stabilization and solidification of salt mixed wastes.

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Novel chemically bonded phosphate ceramics have been investigated for stabilization and solidification of chloride and nitrate salt wastes. Using low-temperature processing, we stabilized and solidified chloride and nitrate surrogate salts (with hazardous metals) in magnesium potassium phosphate ceramics up to waste loadings of 70-80 wt.%. A variety of characterizations, including strength, microstructure, and leaching, were then conducted on the waste forms. Leaching tests show that all heavy metals in the leachant are well below the EPAs universal treatment standard limits. Long-term leaching tests, per ANS 16. 1 procedure, yields leachability index for nitrate ions > 12. Chloride ions are expected ... continued below

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21 p.

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Singh, D. June 26, 1998.

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Description

Novel chemically bonded phosphate ceramics have been investigated for stabilization and solidification of chloride and nitrate salt wastes. Using low-temperature processing, we stabilized and solidified chloride and nitrate surrogate salts (with hazardous metals) in magnesium potassium phosphate ceramics up to waste loadings of 70-80 wt.%. A variety of characterizations, including strength, microstructure, and leaching, were then conducted on the waste forms. Leaching tests show that all heavy metals in the leachant are well below the EPAs universal treatment standard limits. Long-term leaching tests, per ANS 16. 1 procedure, yields leachability index for nitrate ions > 12. Chloride ions are expected to have an even higher (i.e., better) leachability index. Structural performance of these final waste forms, as indicated by compression strength and durability in aqueous environments, satisfies the regulatory criteria. Thus, based on the results of this study, it seems that phosphate ceramics are viable option for containment of salt wastes.

Physical Description

21 p.

Notes

INIS; OSTI as DE00010852

Medium: P; Size: 21 pages

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  • Spectrum '98 Conference, Denver, CO (US), 09/13/1998--09/18/1998

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  • Report No.: ANL/ET/CP-96686
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10852
  • Archival Resource Key: ark:/67531/metadc619509

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  • June 26, 1998

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 7:25 p.m.

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Singh, D. Modified phosphate ceramics for stabilization and solidification of salt mixed wastes., article, June 26, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc619509/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.