WASHING METHOD AND WASHING SYSTEM FOR INCINERATION ASH AND DUST IN COMBUSTION GAS EXTRACTED FROM CEMENT KILN

摘要

[Problems] To minimize harmful effects on operation due to scale adhesion while accommodating increase in the amount of generated chlorine bypass dust and suppress facility cost and running cost including medical agent cost low when incineration ash and dust contained in extracted cement kiln combustion gas are subject to water treatment. [Means for Solving Problems] A water treatment system 1 comprising: a dissolution tank 32 for dissolving a fly ash A in a water W; a dissolution tank 22 for dissolving a dust D contained in combustion gas extracted from a kiln exhaust gas passage running from an inlet end of a cement kiln to a bottom cyclone in a water W; and a vertical filter press 11 for separately filtering a slurry S2 fed from the dissolution tank 32 and a slurry S1 fed from the dissolution tank 22 from each other. It is possible to install water treatment facilities 33-35 for a filtrate L3 of the slurry containing fly ash discharged from the vertical filter press, and water treatment facilities 23-27 for a filtrate L1 of the slurry containing ash discharged from the filtering device.