Microstructural properties of high level waste concentrates and gels with raman and infrared spectroscopies. 1997 annual progress report

One of 84 reports in the series: Fiscal Year 1997 available on this site.

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'Monosodium aluminate, the phase of aluminate found in waste tanks, is only stable over a fairly narrow range of water vapor pressure (22% relative humidity at 22 C). As a result, aluminate solids are stable at Hanford (seasonal average RH {approximately}20%) but are not be stable at Savannah River (seasonal average RH {approximately}40%). Monosodium aluminate (MSA) releases water upon precipitation from solution. In contrast, trisodium aluminate (TSA) consumes water upon precipitation. As a result, MSA precipitates gradually over time while TSA undergoes rapid accelerated precipitation, often gelling its solution. Raman spectra reported for first time for monosodium and trisodium aluminate ... continued below

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13 pages

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Agnew, S.F.; Coarbin, R.A. & Johnston, C.T. 1997-23~.

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  • Los Alamos National Laboratory
    Publisher Info: Los Alamos National Lab., Chemical Science and Technology Div., NM (United States)
    Place of Publication: New Mexico

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  • Main Title: Microstructural properties of high level waste concentrates and gels with raman and infrared spectroscopies. 1997 annual progress report
  • Series Title: Fiscal Year 1997

Description

'Monosodium aluminate, the phase of aluminate found in waste tanks, is only stable over a fairly narrow range of water vapor pressure (22% relative humidity at 22 C). As a result, aluminate solids are stable at Hanford (seasonal average RH {approximately}20%) but are not be stable at Savannah River (seasonal average RH {approximately}40%). Monosodium aluminate (MSA) releases water upon precipitation from solution. In contrast, trisodium aluminate (TSA) consumes water upon precipitation. As a result, MSA precipitates gradually over time while TSA undergoes rapid accelerated precipitation, often gelling its solution. Raman spectra reported for first time for monosodium and trisodium aluminate solids. Ternary phase diagrams can be useful for showing effects of water removal, even with concentrated waste. Kinetics of monosodium aluminate precipitation are extremely slow (several months) at room temperature but quite fast (several hours) at 60 C. As a result, all waste simulants that contain aluminate need several days of cooking at 60 C in order to truly represent the equilibrium state of aluminate. The high level waste (HLW) slurries that have been created at the Hanford and Savannah River Sites over that last fifty years constitute a large fraction of the remaining HLW volumes at both sites. In spite of the preponderance of these wastes, very little quantitative information is available about their physical and chemical properties other than elemental analyses.'

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13 pages

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  • Other: DE00013659
  • Report No.: EMSP-54773--97
  • Grant Number: NONE
  • DOI: 10.2172/13659 | External Link
  • Office of Scientific & Technical Information Report Number: 13659
  • Archival Resource Key: ark:/67531/metadc618314

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  • 1997-23~

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Nov. 3, 2016, 1:28 p.m.

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Agnew, S.F.; Coarbin, R.A. & Johnston, C.T. Microstructural properties of high level waste concentrates and gels with raman and infrared spectroscopies. 1997 annual progress report, report, 1997-23~; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc618314/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.