FIELD: recovery of radioactive wastes by solidifying them. SUBSTANCE: mixer has pressurized vessel 1 mounted on vertical shaft of agitator 4 made in the form of propeller and additional agitator 5 provided with movable fastening device 11. Mixer is also provided with pipe connections 6, 8, and 7 for admitting cement, solid additives, and liquid radioactive wastes, respectively, and also with drain 9 disposed in bottom part of pressurized vessel 1. Decontaminating solution is introduced into pressurized vessel 1 through pipe connection 10. EFFECT: enhanced capacity and reliability, reduced power requirement, and simplified design of mixture. 1 cl, 1 dwg
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