Compositions – Organic luminescent material containing compositions – Scintillating or lasing compositions
Patent
1975-08-25
1977-06-07
Padgett, Benjamin R.
Compositions
Organic luminescent material containing compositions
Scintillating or lasing compositions
G21F 916
Patent
active
040282651
ABSTRACT:
A method for converting sodium nitrate-containing, caustic, radioactive wastes to a solid, relatively insoluble, thermally stable form is provided and comprises the steps of reacting powdered aluminum silicate clay, e.g., kaolin, bentonite, dickite, halloysite, pyrophyllite, etc., with the sodium nitrate-containing radioactive wastes which have a caustic concentration of about 3 to 7 M at a temperature of 30.degree. C to 100.degree. C to thereby entrap the dissolved radioactive salts in the aluminosilicate matrix.
In one embodiment the sodium nitrate-containing, caustic, radioactive liquid waste, such as neutralized Purex-type waste, or salts or oxide produced by evaporation or calcination of these liquid wastes (e.g., anhydrous salt cake) is converted at a temperature within the range of 30.degree. C to 100.degree. C to the solid mineral form-cancrinite having an approximate chemical formula 2(NaAlSiO.sub.4) .sup.. xSalt.sup.. y H.sub.2 O with x = 0.52 and y = 0.68 when the entrapped salt is NaNO.sub.3. In another embodiment the sodium nitrate-containing, caustic, radioactive liquid is reacted with the powdered aluminum silicate clay at a temperature within the range of 30.degree. C to 100.degree. C, the resulting reaction product is air dried eitheras loose powder or molded shapes (e.g., bricks) and then fired at a temperature of at least 600.degree. C to form the solid mineral form-nepheline which has the approximate chemical formula of NaAlSiO.sub.4.
The leach rate of the entrapped radioactive salts with distilled water is reduced essentially to that of the aluminosilicate lattice which is very low, e.g., in the range of 10.sup.-.sup.2 to 10.sup.-.sup.4 g/cm.sup.2 -- day for cancrinite and 10.sup.-.sup.3 to 10.sup.-.sup.5 g/cm.sup.2 -- day for nepheline.
REFERENCES:
patent: 3000072 (1961-09-01), Evans
patent: 3274784 (1966-09-01), Shock et al.
Barrer et al., "Chemistry of Soil Minerals", J. Chem. Soc. (A), 1968, pp. 2475-2485.
White et al., "Ultimate Fission Product Disposal", At. En. Can. Ltd., Chalk River Project No. 391,22 as abstracted in Chem. Abs. 32:17997i.
Stecher et al. Eds. The Merck Index, Merck & Co., Inc. (Rahway, N. J. 1968) "Ethyl Silicate", p. 441.
Durham et al., "Durability of Some Silicate Glasses . . .", At. Ener. Can. Ltd. Chalk River Proj. No. 818 from Chem. Abstracts 53:17459g.
Amphlett, C. B., Treatment and Disposal of Radioactive Waste, (Pergammon Press, New York, 1961) pp. 93-102.
Barney Gary S.
Brownell Lloyd E.
Carlson Dean E.
Kyle Deborah L.
Padgett Benjamin R.
Poteat Robert M.
Sharp Robert K.
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