Title:
METHOD OF ELECTROCHEMICALLY RECOVERING HEAVY METALS FROM FLY ASH
Document Type and Number:
Japanese Patent JP3760261
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method capable of separating and recovering various heavy metals from incineration fly ash or molten fly ash.
SOLUTION: The heavy metals such as copper, cadmium, zinc or the like are extracted from the fly ash by adjusting slurry of the fly ash to pH ≥1. Electrolysis is carried out between an anode and a cathode in a separated solution obtained by the solid-liquid separation of the slurry. The cathode potential is changed into negative gradually or step-wise. As a result, copper, cadmium and zinc are separately deposited by the electrolysis. The solid residue remaining in the solid-liquid separation is adjusted to pH ≤1 to extract lead. The lead is deposited from a separated solution obtained by the solid-liquid separation of the slurry by electrolysis.
Inventors:
Inazumi
Masayoshi Kondo
Hiroshi Tatsumi
Masayoshi Kondo
Hiroshi Tatsumi
Application Number:
JP2001003384A
Publication Date:
March 29, 2006
Filing Date:
January 11, 2001
Export Citation:
Assignee:
Hitachi Zosen Corporation
International Classes:
B09B3/00; C22B3/44; C22B7/02; C22B13/06; C22B15/00; C22B17/00; C22B19/30; C25C1/12; C25C1/16; C25C1/18; C25C7/02; (IPC1-7): B09B3/00; C22B3/44; C22B7/02; C25C1/12; C25C1/16; C25C1/18; C25C7/02; //C22B13/06; C22B15/00; C22B17/00; C22B19/30
Domestic Patent References:
| JP11335748A | ||||
| JP9142842A | ||||
| JP2000290736A | ||||
| JP8035017A | ||||
| JP8240310A |
Attorney, Agent or Firm:
Einosuke Kishimoto
Moriichi Kishimoto
Akira Watanabe
Norihiko Hibi
Kiyosue Yasuko
Moriichi Kishimoto
Akira Watanabe
Norihiko Hibi
Kiyosue Yasuko