Candidate Low-Temperature Glass Waste Forms for Technetium-99 Recovered from Hanford Effluent Management Facility Evaporator Concentrate [electronic resource]
Technetium; Glass; Composite Material; Vitrification; Durability; Melting.
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Online Access (via OSTI) |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Environmental Restoration and Waste Management ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2017.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a Candidate Low-Temperature Glass Waste Forms for Technetium-99 Recovered from Hanford Effluent Management Facility Evaporator Concentrate |h [electronic resource] |
| 260 | |a Washington, D.C. : |b United States. Department of Energy. Office of Environmental Restoration and Waste Management ; |a Oak Ridge, Tenn. : |b distributed by the Office of Scientific and Technical Information, U.S. Department of Energy, |c 2017. | ||
| 300 | |a 56 p. : |b digital, PDF file. | ||
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| 500 | |a Published through SciTech Connect. | ||
| 500 | |a 07/24/2017. | ||
| 500 | |a "la-ur--17-25579" | ||
| 500 | |a Mei Ding; Ming Tang; Jung Ho Rim; Rebecca M. Chamberlin. | ||
| 520 | 3 | |a Alternative treatment and disposition options may exist for technetium-99 (99Tc) in secondary liquid waste from the Hanford Direct-Feed Low-Activity Waste (DFLAW) process. One approach includes development of an alternate glass waste form that is suitable for on-site disposition of technetium, including salts and other species recovered by ion exchange or precipitation from the EMF evaporator concentrate. By recovering the Tc content from the stream, and not recycling the treated concentrate, the DFLAW process can potentially be operated in a more efficient manner that lowers the cost to the Department of Energy. This report provides a survey of candidate glass formulations and glass-making processes that can potentially incorporate technetium at temperatures <700 °C to avoid volatilization. Three candidate technetium feed streams are considered: (1) dilute sodium pertechnetate loaded on a non-elutable ion exchange resin; (2) dilute sodium-bearing aqueous eluent from ion exchange recovery of pertechnetate, or (3) technetium(IV) oxide precipitate containing Sn and Cr solids in an aqueous slurry. From the technical literature, promising candidate glasses are identified based on their processing temperatures and chemical durability data. The suitability and technical risk of three low-temperature glass processing routes (vitrification, encapsulation by sintering into a glass composite material, and sol-gel chemical condensation) for the three waste streams was assessed, based on available low-temperature glass data. For a subset of candidate glasses, their long-term thermodynamic behavior with exposure to water and oxygen was modeled using Geochemist’s Workbench, with and without addition of reducing stannous ion. For further evaluation and development, encapsulation of precipitated TcO2/Sn/Cr in a glass composite material based on lead-free sealing glasses is recommended as a high priority. Vitrification of pertechnetate in aqueous anion exchange eluent solution using a high lead content borate glass, or other low melting glass is also recommended for further evaluation and development. Additional laboratory studies of phase behavior and chemical durability of low-temperature glasses is also recommended to provide risk mitigation if one of the primary development paths proves infeasible. This report is a deliverable for the task “Candidate Low-T Glass Waste Forms for EMF Bottoms On-Site Disposition Alternative Option.” | |
| 520 | 0 | |a Technetium; Glass; Composite Material; Vitrification; Durability; Melting. | |
| 536 | |b AC52-06NA25396. | ||
| 650 | 7 | |a Management Of Radioactive And Non-Radioactive Wastes From Nuclear Facilities. |2 edbsc. | |
| 710 | 2 | |a Los Alamos National Laboratory. |4 res. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Environmental Restoration and Waste Management. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information. |4 dst. | |
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