Phosphate-based glasses and glass ceramics for immobilization of lanthanides and actinides
Source abstract
Abstract
Abstract Borosilicate glasses used to be a choice to vitrify nuclear wastes in most of the countries. However, Russian HLW vitrification plant at the Mayak Production Association (Chelyabinsk Region, Urals) uses phosphate-based glasses. Initially, Russian HLW glasses were based on sodium-aluminophosphate with the following approximate composition (mol.%): 40 Na 2 O , 20 Al 2 O 3 , 40 P 2 O 5 . Recently we have modified this composition by replacing of up to 50% Al 2 O 3 with Fe 2 O 3 . Such replacement increases chemical durability and resistance to devitrification and radiation of the glasses. The phase composition and structure of these glasses containing ~ 10 wt% RE oxides and ~ 10, ~ 50, and ~ 100 wt% UO 3 (over 100 wt%) were studied in details using XRD and FTIR. Glasses and glass-ceramics have high chemical durability. Thus, the glasses and glass ceramics on sodium-aluminum-iron-phosphate basis are good waste forms for lanthanide fraction of HLW generated at spent nuclear fuel pyroprocessing and minor actinides.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Nuclear materials and radiation effects · Glass properties and applications · Recycling and utilization of industrial and municipal waste in materials production
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