Method for removing lead from cement burning furnace

Details Method for removing lead from cement burning furnace Method for removing lead from cement burning furnace

2007-10-19

2010-11-23

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

C423S215500, C106S741000, C106S751000, C106S761000, C106S762000

Reexamination Certificate

active

07837963

ABSTRACT:
A method to efficiently reduce lead content of cement without exerting influence upon quality of the cement. The method comprises the steps of: controlling O2 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° and 1100° 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.

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