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Title:
PROCESS FOR RECOVERING LEAD IN FLY ASH
Document Type and Number:
Japanese Patent JP2001049360
Kind Code:
A
Abstract:

To provide a method with which fly ash is stabilized and, removed lead is recovered by removing the lead contained in the fly ash at a low cost.

Sulfuric acid 3 is added into the fly ash 2 containing heavy metals such as lead, etc., discharged from an incinerator or a fusion furnace, and after extracting the heavy metals except the lead, solid-liquid separation 4 is executed. Subsequently, an alkali thiosulfate 8 is added into the residue 5 containing the lead obtd. by the solid-liquid separation, and after extracting the lead, solid-liquid separation 9 is executed. Further, sufiding agent 13 is added into the filtrate obtd. by the solid-liquid separation, and after making the lead insoluble, solid-liquid separation 14 is executed.


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Inventors:
NAGASAWA MATSUTARO
INOUE TAKU
YAMANAKA TAKESHI
Application Number:
JP22846099A
Publication Date:
February 20, 2001
Filing Date:
August 12, 1999
Export Citation:
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Assignee:
UNITIKA LTD
International Classes:
C22B13/00; B09B3/00; (IPC1-7): C22B13/00; B09B3/00
Domestic Patent References:
JPH1161286A1999-03-05
JPS339858B1
JP2001047001A2001-02-20
JPH10204552A1998-08-04
JPH11199227A1999-07-27
JPH10109077A1998-04-28
JPS339667B1
JPH10192820A1998-07-28



 
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