Title:
【発明の名称】飛灰の無毒化と塩の分離と資源化を一貫処理するプロセス
Document Type and Number:
Japanese Patent JP2920137
Kind Code:
B1
Abstract:
PROBLEM TO BE SOLVED: To make fly ash nontoxic, to change it to a resource, to prolong the life of a final disposal space, of which the site is now extremely difficult to secure and to reduce the size required for it, by classifying fly ash into components and organically integrating their treatments. SOLUTION: Heating fly ash carries out oxidation and removal of free carbon and decomposition and detoxification of an offensive odor. Supplying this fly ash to a washing tank 3 separates the contents therein to a mud-like layer composed of precipitated water-insoluble materials and supernatant water. Water is added again to the mud-like layer which remains in the washing tank 3 again to make it slurry, then it is fed to a decomposition tank 5, and sulfuric acid is injected therein to decompose the remaining fly ash component. A liquid, which overflows the decomposition tank 5, flows into a growth tank 6 to form crystals of a solid phase therein, and a liquid, which overflows the growth tank 7, flows into a separation tank 6 to separate materials with high settling velocity from the slurry liquid. Aqueous solutions having different concentrations discharged by a solid-liquid separator 8 or the like are stored in a circulating liquid tank 10, a part of the stored solution is moved to the washing tank 3 to dissolve water-soluble materials in the fly ash, then it is discharged to a filtration and circulation tank 12 outside a circulatory system of a main liquid, and the remainder of the solution is reused as water for slurry.
Inventors:
HIROSE TOMOHIRO
YAMAMOTO YOICHI
YOKU KAZUHIKO
YAMAMOTO YOICHI
YOKU KAZUHIKO
Application Number:
JP3710998A
Publication Date:
July 19, 1999
Filing Date:
February 19, 1998
Export Citation:
Assignee:
TEKUNO FURONTEIA KK
International Classes:
B09B5/00; B09B3/00; (IPC1-7): B09B5/00; B09B3/00
Domestic Patent References:
| JP7323213A | ||||
| JP5305279A | ||||
| JP83655A | ||||
| JP1025113A |
Attorney, Agent or Firm:
Kaoru Furuya (3 outside)