Patent ID: 7976628

Claim:
A process for the production of cement clinker which comprises the steps of: heating the limestone/dolomite components of the a clinker feed in a first calciner at a temperature of between about 650° C. to about 1050° C., said calciner containing no combustion gases; removing a portion of a CaO/MgO reaction product from said calciner; using said removed CaO/MgO to capture CO 2 from fuel combustion flue gas associated with said cement production process, thereby generating a supply of CaCO 3 /CaMg(CO 3 ) 2 ; introducing said supply of CaCO 3 /CaMg(CO 3 ) 2 from said flue gas environment into said first calciner, said CaCO 3 /CaMg(CO 3 ) 2 thereby releasing CO 2 ; removing released CO 2 from said calciner; and, removing additional reaction products from said calciner and subsequently exposing said reaction products in a second calciner to a temperature of between about 1300° C. to about 1450° C. until clinker is formed.