Patent Number: 055301746
Section: claims

1. A method of vitrifying a high-level radioactive liquid waste comprising removing a precipitate composed mainly of Mo and Zr from the high-level radioactive liquid waste, mixing the resulting high-level radioactive liquid waste with a raw glass material having a chemical composition wherein the B.sub.2 O.sub.3 /SiO.sub.2, ZnO/Li.sub.2 O and Al.sub.2 O.sub.3 /Li.sub.2 O ratios are at least 0.41, at least 1.00 and at least 2.58, respectively, and melt-solidifying the mixture to thereby form a vitrified waste. 2. The method of vitrifying a high-level radioactive liquid waste according to claim 1, wherein the precipitate-removed liquid waste and the raw glass material are mixed in a proportion to form the vitrified waste having a waste content of about 45% by oxide weight and the raw glass material of about 55% by oxide weight.