Title:
METHOD FOR ELECTROCHEMICALLY RECOVERING HEAVY METAL FROM FLY ASH
Document Type and Number:
Japanese Patent JP3911587
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for easily and efficiently separating and recovering various metals from incineration fly ash which is generated when incinerating wastes, such as shredder dust, or from molten fly ash which is generated when the incineration fly ash is further melted by means of plasma, etc.
SOLUTION: Lead is eluted from fly ash by using an aqueous solution of thiosulfate of pH 7-12, and the resultant eluate is electrolyzed to deposit and recover the lead in the form of lead sulfide. Then the pH value of the aqueous solution of thiosulfate after the elution and electrolysis is made to 4-6.5 to elute zinc from the fly ash, and the resultant eluate is electrolyzed to deposit and recover the zinc in the form of zinc sulfide. Subsequently, the pH value of the aqueous solution of thiosulfate after the elution and electrolysis is made to 7-12 to reuse the resultant solution for the method in the claim 1.
Inventors:
Inazumi
Atsushi Yano
Masayoshi Kondo
Hiroshi Tatsumi
Atsushi Yano
Masayoshi Kondo
Hiroshi Tatsumi
Application Number:
JP2001273088A
Publication Date:
May 09, 2007
Filing Date:
September 10, 2001
Export Citation:
Assignee:
Hitachi Zosen Corporation
International Classes:
B09B3/00; C25C1/18; C22B3/04; C22B3/44; C22B7/02; C22B13/00; C22B19/00; C22B19/20; C25C1/16; C25C7/02; (IPC1-7): C25C1/18; B09B3/00; C22B3/04; C22B3/44; C22B7/02; C22B13/00; C22B19/00; C25C1/16; C25C7/02
Domestic Patent References:
| JP2001219136A | ||||
| JP10005736A | ||||
| JP2000290736A | ||||
| JP9175819A | ||||
| JP7060221A |
Attorney, Agent or Firm:
Einosuke Kishimoto
Akira Watanabe
Norihiko Hibi
Kiyosue Yasuko
Akira Watanabe
Norihiko Hibi
Kiyosue Yasuko