EP 0241365 B1 19901114 - PROCESS FOR PREPARING A BOROSILICATE GLASS CONTAINING NUCLEAR WASTES
Title (en)
PROCESS FOR PREPARING A BOROSILICATE GLASS CONTAINING NUCLEAR WASTES
Publication
Application
Priority
FR 8605010 A 19860408
Abstract (en)
[origin: US4797232A] The invention relates to a process for the preparation of a borosilicate glass containing nuclear waste. In this process, an inactive borosilicate matrix is prepared in an aqueous medium by mixing the following: a silica-based gel precursor, a concentrated aqueous solution of a boron compound, and a concentrated aqeuous solution of the vitrification adjuvant, in proportions corresponding to the composition of the final glass minus the waste, with stirring at a high rate of shear, at a temperature of between 20 DEG C. and 80 DEG C., preferably at 65 DEG -70 DEG C., at an acid pH, preferably a pH of between 2.5 and 3.5, so as to form a gelled solution, and the said matrix is heat-treated and the nuclear waste is added at any stage during the said treatment to form, by melting, the final borosilicate glass containing the said waste. The process according to the invention is applied to the treatment of nuclear waste, especially to solutions of fission products.
IPC 1-7
IPC 8 full level
C03B 8/02 (2006.01); C03C 3/089 (2006.01); C03C 3/091 (2006.01); C03C 3/095 (2006.01); C03C 3/097 (2006.01); 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 0241365 A1 19871014; EP 0241365 B1 19901114; AT E58446 T1 19901115; CA 1332503 C 19941018; DE 3766144 D1 19901220; FR 2596910 A1 19871009; JP 2532087 B2 19960911; JP S63106599 A 19880511; US 4797232 A 19890110
DOCDB simple family (application)
EP 87400752 A 19870406; AT 87400752 T 19870406; CA 534190 A 19870408; DE 3766144 T 19870406; FR 8605010 A 19860408; JP 8489387 A 19870408; US 3505187 A 19870406