MONOLITHIC SILICATE GLASS BLOCK FOR IMMOBILIZING LIQUID RADIOACTIVE WASTES AND ITS MANUFACTURING PROCESS Russian patent published in 2004 - IPC

FIELD: recovery of liquid radioactive wastes.

SUBSTANCE: monolithic silicate glass block incorporates following components, mass percent: SiO₂ + ZrO₂, 46 - 50; Na₂O + K₂O + Cs₂O, 18 - 23; CaO₂ + SrO + BaO, 2 - 5; Al₂ O₃ + oxides of rare-earth elements, 5 - 12; Fe₂O₃ + Cr₂O₃ + NiO + MnO₂, 2 - 6; MoO₃ + Nb₂O ₅ + RuO₂ + RhO₃ + TcO₂ + UO₂ + PuO₂ + NpO₂ + Am₂O₃ + Cm₂ O₃, 4 - 6; B₂O₃, 8 - 12; and Cd₂O₃, 0.2 - 2. Proposed process for manufacturing monolithic silicate glass block in induction furnace with crucible cooled down by liquid coolant includes pre-concentration of liquid radioactive wastes and fluxing additives followed by their fusion at 1100 - 1300 ^oC and at coolant temperature of 80 - 300 ^oC. Then fused glass is drained in flasks and block is produced by cooling glass-holding flasks in the open down to 400 - 450 ^oC.

EFFECT: enhanced chemical, thermal, and radiation stability of block; reduced cost of its manufacturing process.

4 cl, 3 tbl