Method of solidifying radioactive waste

Purpose: To obtain dense and stable solidification products. Constitution: Radioactive wastes resulted from nuclear power facilities are integrally solidified using a water-hardenable solidification material prepared by mixing a binder of water-hardenable inorganic compounds, aggregates, inorganic fluidizing material and dispersant. By adding the dispersant and inorganic fluidizing material to the solidification material, individual particles of the inorganic dispersant are dispersed and the fine particles in the binders are also dispersed and enter between the binders and the aggregates to improve the sliding between these particles. As a result, particles constituting the solidification material are uniformly dispersed in the water added to take a readily movable state. Accordingly, the solidification material is easily flowable on the surface of wastes to be processed upon packing of the solidification material and packed easily with no gaps in the container for the solidification material package. (Seki, T.)