Taiheiyo Cement Corporation

Kenzaburou Kondou

Shinichiro Saito

Junichi Terasaki

Noritoshi Tamura

In accordance with the present invention, there is provided a treat chlorine bypass dust while preventing increases in chemical cost and concentrations of heavy metals in clinker, and ensuring stability in quality of cement. In a chlorine bypass facilityextracting a part G of combustion gas, while cooling it, from a kiln exhaust gas passage, which runs from an inlet end of a cement kiln to a bottom cyclone, and recovering a high chlorine concentration chlorine bypass dust Dfrom the extracted gas G, a slurry S containing chlorine bypass dust and SO2 gas or/and CO2 gas are contacted with each other to obtain solid content. The slurry containing chlorine bypass dust and an exhaust gas from the chlorine bypass facility or/and the exhaust gas from the cement kiln can be contacted with each other, and the solid content can be fed to a cement finishing process, which allows cement with low CaO and Ca(OH)2 contents and with stable property such as setting time to be produced.

Treatment device and treatment method for chlorine bypass dust

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 systemcomprising: a dissolution tankfor dissolving a fly ash A in a water W; a dissolution tankfor 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 pressfor separately filtering a slurry Sfed from the dissolution tankand a slurry Sfed from the dissolution tankfrom each other. It is possible to install water treatment facilities-for a filtrate Lof the slurry containing fly ash discharged from the vertical filter press, and water treatment facilities-for a filtrate Lof the slurry containing ash discharged from the filtering device.

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Chiba, Japan

Kenzaburou Kondou