Solidiёcation of Cs-137-Bearing Radioactive Waste in Cenosphere-Based Mineral-Like Hosts for Long-Term Disposal in Granithoids

Theoretical and practical possibility to stabilize Cs-137(Na)-bearing liquid radioactive waste in mineral-like forms which are geochemically compatible with granithoids in its long-term disposal was demonstrated. Perforated cenospheres (SiO2/Al2O3=3.4) of яy ash generated from combustion of kuznetskii coal was used as an aluminosilicate precursor. It was established that solidiёcation of Cs-bearing solutions at 750-1100 °С via the proposed route resulted in glass-crystalline compounds incorporating 53-79 wt. % pollucite with the Cs leaching rate being by 2-3 order of magnitude lower than the standard parameter accepted in Russia for solidiёed high level waste.

• Tatiana A.
• Vasilieva NatalyG.

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