Title:
METHOD FOR RECOVERING HEAVY METAL IN FLY ASH
Document Type and Number:
Japanese Patent JP3532741
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method wherein fly ash is stabilized by removing zinc and lead contained in fly ash, and the removed zinc and lead is recovered.
SOLUTION: After the acid chemical 3 is added to fly ash 1 containing heavy metal such as zinc and lead to be discharged from an incinerator or a melting furnace, the solid is separated front the liquid, followed by the process (a) where the pH regulator 6 and the insolubilizing agent 7 are added to the filtrate containing zinc obtained through the solid-liquid separation to recover zinc as the insoluble 9, and the process (b) where the solubilizing agent 12 is added to the residue containing lead obtained through the solid-liquid separation to extract lead, the solid is separated from the liquid, and the insolubilizing agent 7 is added to the filtrate containing lead obtained through the solid-liquid separation to recover lead as the insoluble 16.
Inventors:
Suzuki, Yasushi
Inoue, Taku
Tanaka, Shinichi
Inoue, Taku
Tanaka, Shinichi
Application Number:
JP23203297A
Publication Date:
May 31, 2004
Filing Date:
August 28, 1997
Export Citation:
Assignee:
UNITIKA LTD
International Classes:
C22B3/44; C22B7/02; C22B13/00; C22B19/00; C22B19/20; C22B19/30; B09B3/00; (IPC1-7): C22B3/44; B09B3/00; C22B7/02; C22B13/00; C22B19/00; C22B19/30
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