Nuclear waste encapsulation in borosilicate glass by chemical po

Details Nuclear waste encapsulation in borosilicate glass by chemical po Nuclear waste encapsulation in borosilicate glass by chemical po

1980-08-11

1983-12-27

Kyle, Deborah L.

Compositions

Radioactive compositions

501 12, G21F 916

Patent

active

044229658

ABSTRACT:
Disclosed is a process for containing a solution of nuclear waste, where the nuclear waste is at least 10% sodium or nitrate. A composition is prepared in an alcohol of about 1 to about 99% of a silicon alkoxide and about 1 to about 99% of a boron alkoxide. The pH of the nuclear waste solution is adjusted to about 4 to about 6 and the pH of the composition is adjusted to match. The composition is dried to about 50 to about 75% of its original volume and is mixed with up to about 30% of the solution of nuclear waste, thereby forming a gel. The mixture is dried and heated at up to about 500.degree. C. Finally, it is consolidated either by warm pressing at about 400.degree. to about 800.degree. C. at about 40,000 to about 100,000 psi, or by melting at about 700.degree. to about 1150.degree. C.

REFERENCES:
patent: 3298960 (1967-01-01), Pitzer
patent: 3791808 (1974-02-01), Thomas
patent: 4028085 (1977-06-01), Thomas
patent: 4224177 (1980-09-01), Macedo et al.
Yoldas, "Monolithic Glass Formation by Chemical Polymerization", J. Mater. Sci., 14 (1979), pp. 1843-1849.
"Process Produces Glass at Room Temperature", Indus. Res. and Devel., Jul. 1980, p. 70.
"New Process Breaks Old Glass Theory", New Scientist, Jun. 26, 1980, p. 396.

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