EP 0241364 B1 19910619 - PROCESS FOR IMMOBILIZING NUCLEAR WASTES IN A BOROSILICATE GLASS
Title (en)
PROCESS FOR IMMOBILIZING NUCLEAR WASTES IN A BOROSILICATE GLASS
Publication
Application
Priority
FR 8605009 A 19860408
Abstract (en)
[origin: US4772431A] The invention relates to a process for the immobilization of nuclear waste in a borosilicate glass. In the process, the following are mixed simultaneously: a silica-based gel precursor, a concentrated aqueous solution of a boron compound, and concentrated aqueous solutions of the other constituents of the final glass, i.e. a solution (solutions) of the waste to be treated and a solution of the vitrification adjuvant, with vigorous stirring, mixing taking place at between 20 DEG and 80 DEG C., preferably at 65 DEG -70 DEG C., in proportions corresponding to the desired composition of the glass, the said mixture having an acid pH, preferably a pH of between 2.5 and 3.5, and the said mixture is dried, calcined at between 300 DEG and 500 DEG C. and then melted. The invention is applied to the treatment of solutions of nuclear waste, especially to solutions of fission products.
IPC 1-7
IPC 8 full level
G21F 9/00 (2006.01); G21F 9/16 (2006.01); G21F 9/30 (2006.01); G21F 9/34 (2006.01)
CPC (source: EP US)
G21F 9/162 (2013.01 - EP US); G21F 9/305 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0241364 A1 19871014; EP 0241364 B1 19910619; AT E64669 T1 19910715; CA 1332504 C 19941018; DE 3770855 D1 19910725; ES 2023920 B3 19920216; FR 2596909 A1 19871009; FR 2596909 B1 19930507; JP H0833493 B2 19960329; JP S632000 A 19880106; US 4772431 A 19880920
DOCDB simple family (application)
EP 87400751 A 19870406; AT 87400751 T 19870406; CA 534191 A 19870408; DE 3770855 T 19870406; ES 87400751 T 19870406; FR 8605009 A 19860408; JP 8489287 A 19870408; US 3505287 A 19870406