Compositions – Radioactive compositions
Patent
1979-08-10
1982-06-08
Kyle, Deborah L.
Compositions
Radioactive compositions
210682, 250493, 250506, 252179, 252449, 252454, 252457, 264 05, 405128, 252632, G21F 916
Patent
active
043338470
ABSTRACT:
This invention relates to the immobilization of toxic, e.g., radioactive materials, internally in a silicate glass or silica gel matrix for extremely long periods of time. Toxic materials, such as radioactive wastes containing radioactive anions, and in some cases cations, which may be in the form of liquids, or solids dissolved or dispersed in liquids or gases, are internally incorporated into a glass matrix, having hydrous organofunctionalsiloxy groups, e.g., hydrous aminoalkylsiloxy or carboxyorganosiloxy, bonded to silicon atoms of said glass and/or hydrous polyvalent metals bonded to silicon atoms of said glass through divalent oxygen linkages or otherwise immobilized therein, by a process which involves the ion exchange of said toxic, radioactive anions with hydroxyl groups attached to said organofunctionalsiloxy groups or with hydroxyl groups attached to the hydrous polyvalent metal. Thereafter, the resulting glass now characterized by a distribution of internally bonded or immobilized, toxic, radioactive anions can be packaged in suitable containers, and disposed of as by burial, and/or they can be sintered to collapse the pores thereof prior to disposal or for producing useful radiation sources. The porous glass or a porous silica gel having said silicon-bonded organofunctionalsiloxy groups and/or said hydrous polyvalent metal oxy groups, the pores of said glass or silica gel remaining open and uncollapsed, can be used advantageously as a backfill for an underground radioactive waste burial site and as overpack in the waste disposal container. Also included is a novel method for bonding the polyvalent metal to the porous silica glass or gel by substituting the protons of the silicon-bonded hydroxyl groups thereof with an alkali metal or ammonium cation followed by displacement of said cation with the non-radioactive polyvalent metal cation.
REFERENCES:
patent: 3364148 (1968-01-01), Kivel
patent: 3923688 (1975-12-01), Hammel et al.
patent: 3925992 (1975-12-01), Backstrom
patent: 3969261 (1976-07-01), Meiller
patent: 3971717 (1976-07-01), Hild et al.
patent: 4056112 (1977-11-01), Calmon
patent: 4118316 (1973-10-01), Talley et al.
patent: 4178270 (1979-12-01), Fujita et al.
Mizutani et al., "Determination of Some Inorganic Cations . . . " J. Non-Cryst. Solids 30 (1978) pp. 23-27.
W. A. Patrick and E. H. Barclay, J. Phys. Chem., vol. 29, p. 1400.
L. V. Ponomareva et al., Zhurnal Prikladnoi Khimii, vol. 48, No. 10, pp. 2150-2155.
Amphlett et al., J. Inorg. Nucl. Chem., vol. 6, pp. 236-245 (1958).
The 1979-1980 Pierce Handbook & General Catalog, pp. 355-379.
Lagakos Nicholas
Macedo Pedro B.
Simmons Catherine J.
Simmons Joseph H.
Tran Danh C.
Kyle Deborah L.
Litovitz T. A.
Macedo P. B.
LandOfFree
Fixation by anion exchange of toxic materials in a glass matrix does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fixation by anion exchange of toxic materials in a glass matrix, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fixation by anion exchange of toxic materials in a glass matrix will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-552240