Cement manufacturing apparatus and method

Abstract

To provide a cement manufacturing apparatus and the like capable of increasing quantity of fly ash used in the apparatus while controlling unburned carbon content in cement within a permissible range. The cement manufacturing apparatus and the like comprises a removal means for removing unburned carbon from gypsum, and a grinding means for grinding gypsum from which unburned carbon is removed by the removal means together with clinker to generate cement. With the apparatus, total unburned carbon content in cement can be reduced, and the quantity of fly ash used in the apparatus can be increased by the reduced amount of unburned carbon. The removal means can remove unburned carbon contained in gypsum as well as unburned carbon contained in fly ash, and the grinding means may grind the fly ash from which unburned carbon is removed together with the gypsum, from which unburned carbon is removed, and clinker. The removal means may simultaneously remove unburned carbon contained in gypsum and unburned carbon contained in fly ash.

1 . A cement manufacturing apparatus comprising:
 a removal means for removing unburned carbon from gypsum; and   a grinding means for grinding the gypsum from which the unburned carbon is removed by the removal means together with clinker to generate cement.   
   
   
       2 . The cement manufacturing apparatus as claimed in  claim 1 , wherein said removal means removes unburned carbon from the gypsum and fly ash, and said grinding means grinds the fly ash from which the unburned carbon is removed together with the gypsum from which the unburned carbon is removed and the clinker. 
   
   
       3 . The cement manufacturing apparatus as claimed in  claim 2 , wherein said removal means simultaneously removes said unburned carbon from the fly ash and the gypsum. 
   
   
       4 . The cement manufacturing apparatus as claimed in  claim 2  further comprising:
 a measuring means for measuring unburned carbon content of the cement generated by the grinding means; and   a calculating means for calculating quantity of the fly ash mixed to the cement based on the measurements by the measuring means.   
   
   
       5 . A cement manufacturing method comprising the steps of:
 removing unburned carbon from gypsum; and   generating cement by grinding the gypsum from which the unburned carbon is removed together with clinker.   
   
   
       6 . The cement manufacturing method as claimed in  claim 5 , wherein unburned carbon is removed from fly ash while said unburned carbon is removed from the gypsum, and the fly ash from which the unburned carbon is removed is ground together with the gypsum from which the unburned carbon is removed and the clinker. 
   
   
       7 . The cement manufacturing method as claimed in  claim 6 , wherein said unburned carbon are simultaneously removed from the fly ash and the gypsum. 
   
   
       8 . The cement manufacturing method as claimed in  claim 6  further comprising the steps of:
 measuring unburned carbon content of the cement; and   calculating quantity of the fly ash mixed to the cement based on the measurements.   
   
   
       9 . The cement manufacturing apparatus as claimed in  claim 3  further comprising:
 a measuring means for measuring unburned carbon content of the cement generated by the grinding means; and   a calculating means for calculating quantity of the fly ash mixed to the cement based on the measurements by the measuring means.   
   
   
       10 . The cement manufacturing method as claimed in  claim 7  further comprising the steps of:
 measuring unburned carbon content of the cement; and   calculating quantity of the fly ash mixed to the cement based on the measurements.