Plastic and nonmetallic article shaping or treating: processes – Shaping or treating radioactive material
Reexamination Certificate
2004-10-21
2009-10-27
Langel, Wayne (Department: 1793)
Plastic and nonmetallic article shaping or treating: processes
Shaping or treating radioactive material
C423S263000, C423S420200, C588S002000, C588S018000
Reexamination Certificate
active
07608209
ABSTRACT:
The present invention relates to the use of a mixed carbonate of formula AB(CO3)2, in which A and B are different and chosen from alkali metals, alkaline-earth metals and rare earths, for the containment of radioactive carbon. This use may for example involve a process comprising: mixing CO2having a radioactive carbon to be contained, or a simple carbonate of an alkali, alkaline-earth or rare-earth metal having a radioactive carbon to be contained, with an aqueous solution of a mixture of AClnand BClmor with an aqueous solution of a mixture of A(OH)n, and B(OH)min order to obtain a precipitate of AB(CO3)2, where n and m are integers sufficient to compensate for the charge of A and B respectively; recovery of the AB(CO3)2precipitate in powder form; and then pressing and sintering of the powder at a 20 temperature below the decarbonation temperature of the mixed carbonate manufactured in order to obtain sintered pellets of mixed carbonates for the containment of the radioactive carbon.
REFERENCES:
patent: 4061700 (1977-12-01), Gallivan
patent: 4383969 (1983-05-01), Bleier
patent: 5286468 (1994-02-01), Chang et al.
patent: 0 085 809 (1983-08-01), None
patent: 0 555 996 (1993-08-01), None
Chang, “Subsolidus phase relations in the aragoniet-type carbonates,” 1971, The American Mineralogist, vol. 56, pp. 1660-1673.
Baron Christophe
Grandjean Agnès
Leturcq Gilles
Commissariat a l''Energie Atomique
Langel Wayne
Martinez Brittany M
McKenna Long & Aldridge LLP
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