Title:
二酸化硫黄を用いた飛灰の処理方法
Document Type and Number:
Japanese Patent JP4639398
Kind Code:
B2
Abstract:
A method for the treatment of a fly ash which comprises a process wherein a slurry of a fly ash is reacted with SO2, to thereby dissolve Ca and Zn in the fly ash into a solution, and these elements are separated from a residue containing Pb and are recovered in the solution; and the method which further comprises a process wherein the above solution containing Ca and Zn is reacted with an oxidizing agent (for example, a gas containing oxygen) or sulfuric acid, to thereby precipitate Ca selectively and allow Zn to remain in the solution in a dissolved state, and these elements, that is, Ca and Zn are recovered separately.
Inventors:
Aichi Taro
Hiroshi Asada
Yatsuka Hideki
Akiyoshi Horiuchi
Tetsuo Doi
Hiroshi Asada
Yatsuka Hideki
Akiyoshi Horiuchi
Tetsuo Doi
Application Number:
JP2004097254A
Publication Date:
February 23, 2011
Filing Date:
March 29, 2004
Export Citation:
Assignee:
DOWA Metals & Mind Co., Ltd.
International Classes:
B09B3/00; C01F11/46; C01G9/00; C22B7/00; C22B7/02; C22B13/00; C22B19/00; C22B19/28
Domestic Patent References:
| JP2000254619A | ||||
| JP9192628A |
Attorney, Agent or Firm:
Komatsu Taka
Kenji Wada
Kenji Wada