Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
METHOD FOR REMOVING LEAD FROM CEMENT KILN
[Subject] To efficiently reduce lead content of cement without exerting influence upon quality of the cement. [Means for Solution] The method comprises the steps of: controlling O 2 concentration of combustion gas in an inlet end of a cement kiln to 5 % or lower and/or CO concentration thereof 1000 ppm or more; extracting a part of combustion gas from the cement kiln and collecting dust contained in the combustion gas; and collecting lead from the dust collected. With this, the area where raw material temperature in the cement kiln is between 800°C and 1100°C can be turned into reducing atmosphere to sharply increase volatilization rate of lead, and collection of lead from the dust allows lead content of cement to efficiently be reduced without exerting influence upon quality of the cement. Together with the control described above, where the inner diameter of the cement kiln is D and the distance from the inlet end of the cement kiln longitudinally into the kiln is L, supplying fuel and/or raw material including inflammable material to the area where L/D of the cement kiln is 0 or more and 12 or lower causes securely maintaining the reducing atmosphere of the area.
METHOD FOR REMOVING LEAD FROM CEMENT KILN
[Subject] To efficiently reduce lead content of cement without exerting influence upon quality of the cement. [Means for Solution] The method comprises the steps of: controlling O 2 concentration of combustion gas in an inlet end of a cement kiln to 5 % or lower and/or CO concentration thereof 1000 ppm or more; extracting a part of combustion gas from the cement kiln and collecting dust contained in the combustion gas; and collecting lead from the dust collected. With this, the area where raw material temperature in the cement kiln is between 800°C and 1100°C can be turned into reducing atmosphere to sharply increase volatilization rate of lead, and collection of lead from the dust allows lead content of cement to efficiently be reduced without exerting influence upon quality of the cement. Together with the control described above, where the inner diameter of the cement kiln is D and the distance from the inlet end of the cement kiln longitudinally into the kiln is L, supplying fuel and/or raw material including inflammable material to the area where L/D of the cement kiln is 0 or more and 12 or lower causes securely maintaining the reducing atmosphere of the area.
METHOD FOR REMOVING LEAD FROM CEMENT KILN
VERFAHREN ZUR ENTFERNUNG VON BLEI AUS EINEM ZEMENTOFEN
PROCÉDÉ D'ÉLIMINATION DU PLOMB D'UN FOUR À CIMENT
TERASAKI JUNICHI (Autor:in) / WADA HAJIME (Autor:in) / HAYASHIDA TAKAHIRO (Autor:in) / OKAMURA SOICHIRO (Autor:in)
14.10.2015
Patent
Elektronische Ressource
Englisch
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