Method of separating exothermic elements from high-level radioac

Details Method of separating exothermic elements from high-level radioac Method of separating exothermic elements from high-level radioac

1995-08-30

1996-11-12

Mai, Ngoclan

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423158, 423184, 210725, 210727, C22B 2600

Patent

active

055749607

ABSTRACT:
A method of separating exothermic elements of Cs and Sr from a high-level radioactive liquid waste. The method comprises a denitration step wherein formic acid is added to the high-level liquid waste so as to adjust its pH to about 5, thereby causing most of the elements other than Cs and Sr to precipitate in the high-level liquid waste to obtain a denitrated liquid waste containing Cs and Sr in high concentrations. The denitrated liquid waste is then subjected to a pH adjustment step wherein ammonia is added to the denitrated liquid waste so as to adjust its pH to about 7.5 to 9, thereby removing by precipitation the elements other than Cs and Sr remaining in the denitrated liquid waste. When the thus resulting precipitate freed of Cs and Sr is vitrified, the waste content in the vitrified waste can be increased.

REFERENCES:
patent: 4770783 (1988-09-01), Gustavsson et al.
patent: 4790960 (1988-12-01), Heckmann et al.
patent: 4804498 (1989-02-01), Mizuno et al.
patent: 5144063 (1992-09-01), Sullivan
Preliminary Report of 1994 Fall Meeting of the Atomic Energy Society of Japan (Sep. 28-30, 1994): "M8 Behavior Of Strontium During Denitration Of HLLW With Formic Acid", published on Sep. 5, 1994.
Preliminary Report of 1993 Spring Meeting of the Atomic Energy Society of Japan (Mar. 27-29, 1993): "H40 Separation Of Heat-Generating Elements From HLLW By Denitration", published on Mar. 10, 1993.

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