Title:
METHOD OF DISPOSAL OF WASTE CONTAINING HEAVY METAL AND SEALING COMPOUND SUITABLE FOR THE DISPOSAL
Document Type and Number:
WIPO Patent Application WO/1999/001236
Kind Code:
A1
Abstract:
A method for insolubilizing and stabilizing a heavy metal contained in a waste, which comprises melt-kneading the waste (A) containing a heavy metal together with an alkali metal compound or alkaline earth metal compound (B) and either sulfur (C) or a sulfide (D) optionally further with a metal salt (E) which has a higher standard electrode potential than those of cations of ingredient (B) or (E) in the presence of a nonaqueous medium, and then cooling the melt to solidify it. Thus, the heavy metal contained in the waste can be efficiently immobilized and prevented from dissolving out.
Inventors:
Mizutani, Makoto (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Hachiya, Satoshi (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Akagawa, Toshiyuki (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Hachiya, Satoshi (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Akagawa, Toshiyuki (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Application Number:
PCT/JP1998/002925
Publication Date:
January 14, 1999
Filing Date:
June 30, 1998
Export Citation:
Assignee:
IDEMITSU KOSAN CO., LTD. (1-1 Marunouchi 3-chome, Chiyoda-ku, Tokyo, 100-0005, JP)
Mizutani, Makoto (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Hachiya, Satoshi (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Akagawa, Toshiyuki (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Mizutani, Makoto (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Hachiya, Satoshi (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
Akagawa, Toshiyuki (1280, Kamiizumi Sodegaura-shi, Chiba, 299-0293, JP)
International Classes:
A62D3/33; A62D3/36; B09B3/00; A62D101/08; A62D101/43; (IPC1-7): B09B3/00; A62D3/00
Attorney, Agent or Firm:
Tohei, Masamichi (Idemitsu Kosan Co. Ltd, 24-4, Anesakikaiga, Ichihara-shi Chiba, 299-0107, JP)
Download PDF: