Vitrification of waste arising from dismantling operations using DEM&MELT technology
Résumé
Among them, sludges/slurries represent a significant part of the produced waste. Their chemical composition and their humidity level, which can be variable, make their conditioning a challenge. One way to manage this waste is the vitrification process. This process has the advantage of stabi-lizing the waste in an inert mineral matrix, and of reducing the volume of waste to be stored, thanks to the high waste incorporation capacity of glass. In order to significantly increase the waste loading, a crystallized matrix or a composite matrix can be considered.
The In-Can vitrification tool DEM&MELT, developed by the consortium CEA (The Alternative Ener-gies and Atomic Energy Commission), Orano and ECM Technologies is flexible enough to accom-modate a varied waste stream and particularly adapted to sludges/slurries from dismantling opera-tions. For this purpose, it is important to develop a vitrification adjuvant with optimized composition, in a suitable form in accordance with feeding system options.
Examples on inactive surrogates slurries from Fukushima Effluent Treatment* and on a sulphate-rich-sludge will be described in this study. If the first example has been investigated from the Labor-atory to Pilot scale; for the second one, the temperature should be lower than usual ones used for glass elaboration, due to the composition of the waste, involving the use of low-viscosity frits. In this case, only lab scale route has been explored up to date.
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