Method for making cement using aragonite
AssigneeGeneral Portland, Inc.
InventorsErnest B. Thorn, Jr., Charles W. Grube, Walter W. Rowe, Johann A. Schueler
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Abstract
An improved process for making cement wherein aragonite, a natural orthorombic crystalline form of calcium carbonate, is employed in a substantially dry, naturally recovered, unprocessed state as the calcium carbonate constituent. The raw kiln feed of the aragonite and argillaceous materials can be introduced into the kiln together and/or separately to produce the desired raw kiln clinker feed within the kiln. The argillaceous material employed can be in a substantially dry state or can be present as an aqueous slurry.
Claims12
An improved process for producing Portland cement clinker using aragonite as the calcium carbonate constituent comprising:
- a. forming a raw kiln feed consisting essentially of substantially dry, naturally recovered, unprocessed aragonite and an argillaceous material;
- chemically balanced to produce Portland cement clinker and
- b. burning said raw kiln feed within a rotary kiln to produce a Portland cement clinker having a free-lime content of less than about 2%.
Dependencies are inferred from the claim text.