The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 1989
Filed:
Jan. 27, 1987
Norimitsu Kurumada, Ibaraki, JP;
Hiroshi Kuribayashi, Ibaraki, JP;
Setsuo Shibata, Yokohama, JP;
Toshikatsu Wakabayashi, Miyagi, JP;
Akira Hasegawa, Ibaraki, JP;
Mamoru Shibuya, Aichi, JP;
JGC Corporation, Tokyo, JP;
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.