Title:
TREATMENT METHOD FOR FLY ASH CONTAINING HEAVY METALS
Document Type and Number:
Japanese Patent JP3944556
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method in which useful heavy metals in fly ash are separated from chlorine and separated/recovered in a recyclable form in a smelting process.
SOLUTION: This method includes a process in which fly ash is added with an alkaline agent, preferably, sodium hydroxide solution so as to leach the heavy metals, thereafter, the slurry is deluted and adjusted to pH 7-13 by adding a mineral acid, and then separated into precipitates containing the heavy metals and chlorine solution. If required, a heat-treating process in which the precipitates containing the heavy metals are further heated and treated, is added to the method.
Inventors:
Ryotsugu Ito
Hiroyuki Ono
Kenji Ichiyasu
Hiroyuki Ono
Kenji Ichiyasu
Application Number:
JP2002010025A
Publication Date:
July 11, 2007
Filing Date:
January 18, 2002
Export Citation:
Assignee:
DOWA ECO-SYSTEM Co., Ltd.
International Classes:
B09B3/00; C22B3/44; C22B7/02; C22B13/00; C22B15/00; C22B19/00; C22B19/20; (IPC1-7): B09B3/00; C22B3/44; C22B7/02; C22B13/00; C22B15/00; C22B19/00
Domestic Patent References:
| JP58045783A | ||||
| JP8141539A | ||||
| JP10204548A | ||||
| JP2000212654A |
Foreign References:
| WO1998056464A1 |
Attorney, Agent or Firm:
Kenji Wada