JPS6059260B

PURPOSE:To make it possible to use a main mixer of small capacity and reduce the amount of a washing waste water, by mixing a radioactive waste with a thermosetting resin in the first mixing step, and then mixing the mixture slurry obtained in the main mixing step with a polymerization initiator. CONSTITUTION:Radioactive waste powder is mixed with a thermosetting resin and an additive, e.g. polymerization accelerator, in given amounts respectively, and the mixture is introduced into a preliminary mixer of large capacity and mixed in the first step. The resultant slurry mixture is sent to a main mixer, and mixed with a given amount of a polymerization initiator. The mixture is then filled in a receiver, cured, solidified and discharged to a receiver. A washing liquid is sent to the main mixer to remove the remaining resin. EFFECT:The constant amount of the radioactive waste can be maintained due to the large capacity of the first mixer, and the amount of the washing waste can be reduced.