Production of a High-Level Waste Glass from Hanford Waste Samples

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The HLW glass was produced from a HLW sludge slurry (Envelope D Waste), eluate waste streams containing high levels of Cs-137 and Tc-99, solids containing both Sr-90 and transuranics (TRU), and glass-forming chemicals. The eluates and Sr-90/TRU solids were obtained from ion-exchange and precipitation pretreatments, respectively, of other Hanford supernate samples (Envelopes A, B and C Waste). The glass was vitrified by mixing the different waste streams with glass-forming chemicals in platinum/gold crucibles and heating the mixture to 1150 degree C. Resulting glass analyses indicated that the HLW glass waste form composition was close to the target composition. The targeted ... continued below

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8 p.

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Crawford, C. L.; Farrara, D. M.; Ha, B. C. & Bibler, N. E. September 1998.

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Description

The HLW glass was produced from a HLW sludge slurry (Envelope D Waste), eluate waste streams containing high levels of Cs-137 and Tc-99, solids containing both Sr-90 and transuranics (TRU), and glass-forming chemicals. The eluates and Sr-90/TRU solids were obtained from ion-exchange and precipitation pretreatments, respectively, of other Hanford supernate samples (Envelopes A, B and C Waste). The glass was vitrified by mixing the different waste streams with glass-forming chemicals in platinum/gold crucibles and heating the mixture to 1150 degree C. Resulting glass analyses indicated that the HLW glass waste form composition was close to the target composition. The targeted waste loading of Envelope D sludge solids in the HLW glass was 30.7 wt percent, exclusive of Na and Si oxides. Condensate samples from the off-gas condenser and off-gas dry-ice trap indicated that very little of the radionuclides were volatilized during vitrification. Microstructure analysis of the HLW glass using Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Analysis (EDAX) showed what appeared to be iron spinel in the HLW glass. Further X-Ray Diffraction (XRD) analysis confirmed the presence of nickel spinel trevorite (NiFe2O4). These crystals did not degrade the leaching characteristics of the glass. The HLW glass waste form passed leach tests that included a standard 90 degree C Product Consistency Test (PCT) and a modified version of the United States Environmental Protection Agency Toxicity Characteristic Leaching Procedure (TCLP).

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8 p.

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INIS; OSTI as DE98057408

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  • SPECTRUM `98: nuclear and hazardous waste management international topical meeting, Denver, CO (United States), 13-18 Sep 1998

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  • Other: DE98057408
  • Report No.: WSRC-MS--98-00447
  • Report No.: CONF-980905--
  • Grant Number: AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 337329
  • Archival Resource Key: ark:/67531/metadc683974

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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.

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  • September 1998

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 10, 2016, 2:41 p.m.

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Crawford, C. L.; Farrara, D. M.; Ha, B. C. & Bibler, N. E. Production of a High-Level Waste Glass from Hanford Waste Samples, article, September 1998; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc683974/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.