Process for incorporating coal ash into cement clinker
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United States of America Patent
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Jul 20, 2004
Grant Date -
Jun 24, 2004
app pub date -
Dec 23, 2002
filing date -
Dec 23, 2002
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Abstract
A method of cement clinker manufacture comprises feeding a clinker feed material containing a source of calcium carbonate 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; a coal ash derived from burning pulverized lignite or sub-bituminous coal is included in the feed material fed into the feed end to replace a portion of the source of calcium carbonate, and provides a source of calcium as well as other components notably silicon and aluminum, in the formation of the cement clinker, with a lowering of the emission of carbon dioxide in the kiln, per unit weight of cement clinker produced.
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