Patent ID: 6764544
Filing Date: 2004-07-20
Classification: C04B,Y02P

Abstract:
In a method of cement clinker manufacture in which a clinker feed material containing a source of calcium carbonate is fed into a feed end of a cement kiln, the feed material is heat processed in the kiln to produce cement clinker with emission of carbon dioxide from thermal decomposition of said source of calcium carbonate and discharge of the carbon dioxide from the kiln, and cement clinker is discharged from a discharge end of the kiln, the improvement wherein a Class C fly ash derived from burning pulverized lignite or sub-bituminous coal is included in said feed material in said kiln to replace a portion of said source of calcium carbonate in the formation of said cement clinker, with a lowering of the emission of carbon dioxide in said kiln, per unit weight of cement clinker produced, said fly ash comprising fine fly ash particles agglomerated together to agglomerates of 0.1 mm to 6 inches.