Long-term performance of glasses for Hanford low-level waste

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The long-term performance of glasses developed for stabilizing Hanford low-level radioactive waste is being assessed using static leach tests conducted for up to one year and under conditions that accelerate Corrosion. These tests support development of durable waste-form compositions and application of performance assessment models. Static leach tests were run with crushed glass at glass surface area/solution volume ratios of 2000 and 20,000 m{sup {minus}1} and temperatures of 20, 40, 70, and 90{degrees}C. All tests showed sodium to be released from the glass faster than boron or silicon. These results are interpreted in terms of the glass structure, the corrosion ... continued below

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8 p.

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Bakel, A.J.; Ebert, W.L. & Luo, J.S. July 1, 1995.

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Description

The long-term performance of glasses developed for stabilizing Hanford low-level radioactive waste is being assessed using static leach tests conducted for up to one year and under conditions that accelerate Corrosion. These tests support development of durable waste-form compositions and application of performance assessment models. Static leach tests were run with crushed glass at glass surface area/solution volume ratios of 2000 and 20,000 m{sup {minus}1} and temperatures of 20, 40, 70, and 90{degrees}C. All tests showed sodium to be released from the glass faster than boron or silicon. These results are interpreted in terms of the glass structure, the corrosion mechanism, and the effects of time, glass surface area/leachant volume ratio and temperature. Vapor hydration tests were conducted at elevated temperatures (70-200{degrees}C) using glasses containing various amounts of SiO{sub 2}, Na{sub 2}O, B{sub 2}O{sub 3}, CaO, and Al{sub 2}O{sub 3}. The response of a glass in these tests is relevant to its durability over very long disposal times. Different responses were observed in the tests: some glasses completely corroded within a few days while others were only slightly corroded. Corrosion led to the formation of analcime and gobbinsite; the corrosion rate increased significantly after these phases formed implications of these test results for the long-term glass durability are discussed.

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8 p.

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INIS; OSTI as DE95013781

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  • 97. annual meeting of the American Ceramic Society, Cincinnati, OH (United States), 30 Apr - 1 May 1995

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  • Other: DE95013781
  • Report No.: ANL/CMT/CP--84526
  • Report No.: CONF-950401--15
  • Grant Number: W-31-109-ENG-38;AC06-76RL01830
  • Office of Scientific & Technical Information Report Number: 87074
  • Archival Resource Key: ark:/67531/metadc794782

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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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  • July 1, 1995

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 12, 2018, 6:21 p.m.

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Bakel, A.J.; Ebert, W.L. & Luo, J.S. Long-term performance of glasses for Hanford low-level waste, article, July 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc794782/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.