Compositions – Radioactive compositions
Patent
1987-01-27
1989-01-24
Locker, Howard J.
Compositions
Radioactive compositions
159 473, 159DIG12, 210710, 210712, 210751, 252631, 252632, 423158, 423182, 423183, 423184, 423277, 423279, G21F 916, G21F 908, F26B 700, B01D 100
Patent
active
048000426
ABSTRACT:
A volume-reducing solidification treatment method for radioactive waste liquid containing boron primarily in the form of boric acid or borates is disclosed.
After an alkali is added to the waste water to adjust pH thereof, and optionally after evaporation concentration is carried out, soluble calcium compounds such as Ca(OH).sub.2 are added, the waste water is stirred at a specific temperature to form insoluble calcium borate aged at a lower temperature than that of forming borate, and evaporation and concentration is carried out, which raises the concentration of the solid component. The concentrated liquid obtained is solidified with cement.
The concentrated liquid may also be dried into a powder using a thin film evaporator.
Liquid containing insoluble calcium borate obtained after solid-liquid separation may be recycled for use as a waste water pH adjusting agent, or, may be evaporated and concentrated, and the concentrated liquid may be solidified with cement along with the concentrated solid component obtained through solid-liquid separation.
REFERENCES:
patent: 3890244 (1975-06-01), Carlin
patent: 4086325 (1978-04-01), Cordier et al.
patent: 4122028 (1978-10-01), Iffland et al.
patent: 4253985 (1981-03-01), Filter et al.
patent: 4379081 (1983-04-01), Rootham et al.
patent: 4409137 (1983-10-01), Mergan et al.
patent: 4671897 (1987-06-01), Mori et al.
Hasegawa Akira
Kuribayashi Hiroshi
Kurumada Norimitsu
Shibata Setsuo
Shibuya Mamoru
JGC Corporation
Locker Howard J.
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