ALUMINUM PHOSPHATE GLASS FOR IMMOBILISATION OF RADIOACTIVE WASTES Russian patent published in 2019 - IPC G21F9/16 

FIELD: processing and recycling of wastes; nuclear engineering.

SUBSTANCE: invention relates to the localization of liquid radioactive waste, in particular to compositions for curing liquid radioactive solutions and pulps by vitrifying them. Alumophosphate glass for immobilisation of radioactive wastes contains sodium oxide, aluminum oxide, phosphorus oxide and impurities of oxides of monovalent and multivalent elements (fission and corrosion products, as well as actinides), as well as a modifying additive, with the following ratio of components, wt%: Na₂O – 20.0–25.0, Al₂O₃ – 13.2–15.5, P₂O₅ – 48.0–55.0, modifying additive – 2.0–10.0, sum of waste oxides excluding Al₂O₃, impurities of univalent and multivalent oxide (fission and corrosion products, as well as actinoids) 5.0–10.7.

EFFECT: invention enables to reduce crystallisation effects in aluminophosphate glass with hardened radioactive wastes at thermal action near devitrification temperatures (450–550 °C).

1 cl, 2 tbl