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3 | Glass waste form for Tc

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2017.02.07 / 179

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 A new alkali-alumino tellurite
glass composition was developed to immobilize highly-volatile technetium (Tc)
wastes generated from the pyrochemical processing technology. Tellurite glass
can incorporate up to 7 mass% of rhenium (Re, used as a surrogate for Tc) with
an average retention of 86%. Normalized elemental releases evaluated by
seven-day product consistency test (PCT) satisfied the immobilized low activity
waste requirements of United States when concentration of Ca(ReO4)2
in the glass was < 12 mass%. Re ions form Re7+ and are
coordinated with four oxygens to form ReO4- tetrahedra.
These tetrahedra bond to modifiers such as Ca2+ or Na+
that are further connected to the tellurite glass network by Ca2+
(or Na+) – non-bridging oxygen bonds
 

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