Compositions – Organic luminescent material containing compositions – Scintillating or lasing compositions
Patent
1973-09-26
1976-05-25
Padgett, Benjamin R.
Compositions
Organic luminescent material containing compositions
Scintillating or lasing compositions
61 5, G21F 924
Patent
active
039591727
ABSTRACT:
Radionuclides are immobilized in virtually an insoluble form by reacting at a temperature of at least 90.degree.C as an aqueous alkaline mixture having a solution pH of at least 10, a source of silicon, the radionuclide waste and a metal cation, the molar ratio of silicon to said metal cation being on the order of unity to produce a gel from which complex metalosilicates crystallize to entrap the radionuclides within the resultant condensed crystal lattice. The product is a silicious stone-like material which is virtually insoluble and non-leachable in alkaline or neutral environment. One embodiment provides for the formation of the complex metalo-silicates, such as synthetic pollucite, by gel formation with subsequent calcination to the solid product; another embodiment utilizes a hydrothermal process, either above ground or deep within basalt caverns, at greater than atmospheric pressures and a temperature between 90.degree. - 500.degree.C to form complex metalo-silicates, such as strontium aluminosilicate. Finally, another embodiment provides for the formation of complex metalo-silicates, such as synthetic pollucite, by slurrying an alkaline mixture of bentonite or kaolinite with a source of silicon and the radionuclide waste in salt form.
In each of the embodiments a mobile system is achieved whereby the metalo-silicate constituents reorient into a condensed crystal lattice forming a cage structure with the condensed metalo-silicate lattice which completely surrounds the radionuclide and traps the radionuclide therein; thus rendering the radionuclide virtually insoluble.
REFERENCES:
patent: 3252757 (1966-05-01), Granquist
patent: 3340202 (1967-09-01), Olombel
"GE Gel May Hold Radioactive Waste" Chemical & Engineering News Vol. 36, Jan. 1958 p. 42.
"A Hydrothermally Synthesized Iron Analog of Pollucite - Its Structure Significance" Am. Minerologist 48 p. 100-109 (1963).
Brownell Lloyd E.
Isaacson Raymond E.
Horan John A.
Kyle Deborah L.
Padgett Benjamin R.
Poteat Robert M.
The United States of America as represented by the United States
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