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Title: Microwave-specific heating of crystalline species in nuclear waste glass

Here, the microwave heating of a crystal-free and a partially trevorite-crystallized nuclear waste glass simulant was evaluated. Our results show that a 500-mg monolith of partially crystallized waste glass can be heated from room temperature to above 1600°C within 2 min using a single-mode, highly focused, 2.45 GHz microwave, operating at 300 W. Using X-ray diffraction measurements, we show that trevorite is no longer detectable after irradiation and thermal quenching. When a crystal-free analog of the same waste glass simulant composition was exposed to the same microwave radiation, it could not be heated above 450°C regardless of the heating time. The reduction in crystalline content achieved by selectively heating spinels in the presence of glass suggests that microwave-specific heating should be further explored as a technique for remediating crystal accumulation in a glass melt.
Authors:
 [1] ;  [1] ;  [1]
  1. Savannah River National Laboratory, Aiken SC
Publication Date:
Report Number(s):
SRNL-STI-2016-00364
Journal ID: ISSN 2041-1286
Grant/Contract Number:
AC09-08SR22470
Type:
Accepted Manuscript
Journal Name:
International Journal of Applied Glass Science
Additional Journal Information:
Journal Volume: 8; Journal Issue: 2; Journal ID: ISSN 2041-1286
Publisher:
American Ceramic Society
Research Org:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; microwave; waste glass; spinel
OSTI Identifier:
1352521
Alternate Identifier(s):
OSTI ID: 1401458