Title:
METHOD FOR CLASSIFYING AND RECOVERING HEAVY METAL FROM INCINERATION ASH
Document Type and Number:
Japanese Patent JP2944466
Kind Code:
B2
Abstract:
PURPOSE: To classify and recover heavy metals intended to be separated, classified and recovered as sulfides with high purity and high recovery rate always without increasing sulfur component content in treated waste water even when kinds and amounts of heavy metals in incineration ash which is the object to be classified and recovered vary from day to day.
CONSTITUTION: A heavy metal solution in which the heavy metals in incineration ash are eluted is mixed with sodium sulfide, etc., and is pH-adjusted to precipitate and separate a part of the heavy metals as sulfides. After separation of precipitates, the solution is mixed with sodium sulfide, etc., again and is pH- adjusted to precipitate and separate a part or all of the heavy metals as sulfides. At this time, the amounts of the respective heavy metals in the heavy metal solution are obtained by analysis and the amounts of heavy metals to be precipitated and separated are previously calculated therefrom and amount of sodium sulfide, etc., to be added is set as amount of sulfer by making chemical equivalent of the amounts of the calculated heavy metals as a reference.
Inventors:
MIZUKAMI SHUNICHI
KINARI TOSHIHIDE
KAMEOKA YOSHIBUMI
KAWABATA HIROAKI
KINARI TOSHIHIDE
KAMEOKA YOSHIBUMI
KAWABATA HIROAKI
Application Number:
JP15343395A
Publication Date:
September 06, 1999
Filing Date:
June 20, 1995
Export Citation:
Assignee:
KOBE SEIKOSHO KK
International Classes:
C22B3/44; C22B7/02; C22B13/00; C22B15/00; C22B19/20; B09B3/00; (IPC1-7): C22B7/02; B09B3/00; C22B3/44; C22B13/00; C22B15/00; C22B19/20
Domestic Patent References:
| JP5687634A | ||||
| JP275003B1 |
Attorney, Agent or Firm:
Akeda Kan