Title:
FLY ASH RECYCLING TREATMENT
Document Type and Number:
Japanese Patent JP3619069
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a fly ash recycling treatment for highly efficiently recovering lead and zinc contained in fly ashes and recovering valuable materials other than lead and zinc with high purity and at high yield without discharging wastes.
SOLUTION: This recycling method comprises the steps of recovering zinc as zinc-insolbilized residue by extracting zinc from fly ashes by adding sulfuric acid to the fly ashes, effecting solid-liquid separation adding a pH adjusting agent and a sulfurizing chemical to the obtained zinc-extracted solution then effecting solid-liquid separation and recovering salts as solid salts by removing impurities in the zinc-insobilized filtrate obtained in the preceding step and effecting evaporation and condensation and at the same time recovering water by condensing evaporated steam.
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Inventors:
Nagasawa Matsutaro
Taku Inoue
Takeshi Yamanaka
Taku Inoue
Takeshi Yamanaka
Application Number:
JP22530799A
Publication Date:
February 09, 2005
Filing Date:
August 09, 1999
Export Citation:
Assignee:
UNITIKA LTD.
International Classes:
C22B13/00; C22B19/00; C22B19/20; B09B3/00; (IPC1-7): B09B3/00; C22B13/00; C22B19/00
Domestic Patent References:
| JP10204552A | ||||
| JP11199227A | ||||
| JP10109077A | ||||
| JP33009667B1 | ||||
| JP10192820A | ||||
| JP1161286A |
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