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US 4,361,505 AGranted
Process for treating radioactive waste
AssigneeHitachi, Ltd.
InventorsMakoto Kikuchi, Koichi Chino, Fumio Kawamura, Hideo Yusa
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AssigneeHitachi, Ltd.
InventorsMakoto Kikuchi, Koichi Chino, Fumio Kawamura, Hideo Yusa
Estimating the term…
N-.beta.-(aminoethyl)-.gamma.-aminopropyltrimethoxysilane [NH.sub.2 (CH.sub.2).sub.2 NH(CH.sub.2).sub.3 Si(OCH.sub.3).sub.3 ] as a silane coupling agent and SiO.sub.(2-x) (ONa).sub.x/2 (OH).sub.x/2 as colloidal silica are mixed into a radioactive liquid waste containing sodium sulfate as a main component, coming from a boiling water-type, nuclear power plant as an effluent. The resulting mixed radioactive liquid waste is supplied into a vessel provided with a rotating shaft with blades. The rotating shaft is revolved while heating the radioactive liquid waste in the vessel, thereby making the radioactive liquid waste into powder. The resulting powder containing the silane coupling agent and the colloidal silica is shaped into pellets by a pelletizer. The pellets having a low hygroscopicity and a high strength are obtained.
A process for treating a radioactive waste, which comprises mixing a radioactive liquid waste produced from radioactive material handling facilities with at least 2% by weight of a binder based on solid matter in the radioactive waste, said binder comprising an organosilicon monomer containing at least two different reactive groups in one molecule and being soluble or dispersible in the radioactive liquid waste, then drying the radioactive liquid waste containing said binder into powder, and shaping the powder containing the binder into pellets.
Dependencies are inferred from the claim text.