C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/180
C22B 60/00 (2006.01)
Patent
CA 1091033
ABSTRACT An actinide-containing organic waste is treated to achieve a substantial reduction in the volume of the organic waste and provide for recovery of the actinide constituent therefrom. The organic actinide-containing waste is reacted with a source of gaseous oxygen in a molten salt bath main- tained at an elevated temperature to produce gaseous reaction products comprising carbon monoxide and water vapor. The actinide and inorganic ash constituents of the waste are retained in the molten salt. Intermittently or continuously at least a portion of the molten salt is withdrawn and mixed with an aqueous medium to dissolve the salt constituents. The medium then is filtered to remove the insoluble inorganic ash constituents and the actinide. The filter cake then is leached with an inorganic acid to recover the actinide. The filtrate is boiled, preferably in a zone of reduced pressure, to evaporate water and precipitate the alkali metal carbonate which is recovered therefrom for recycle to the combustion chamber. The filtrate, after carbonate removal, is recycled to quench additional molten salt. In a particular preferred embodiment, wherein the waste material also contains halides, the filtrate, after carbonate removal, is cooled to precip- itate an alkali metal halide which is recovered for disposal. The filtrate then is recycled for use as the aqueous medium to quench additional molten salt.
275040
Grantham Leroy F.
Mckenzie Donald E.
Rennick Robert D.
Ridout & Maybee Llp
Rockwell International Corporation
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