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US 6,833,105 B2Granted
Method for making aluminate cement
AssigneeCarrieres du Boulonnais
InventorsGuy Beauvent, Michel Deletter, Eric Holard, Jacques Tirlocq
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AssigneeCarrieres du Boulonnais
InventorsGuy Beauvent, Michel Deletter, Eric Holard, Jacques Tirlocq
Estimating the term…
A process of manufacturing a sulfoaluminate or ferroaluminate cement, and an apparatus for the manufacture. The cement is manufactured from a mixture containing CaCO3, Al3 and/or Al(OH)3, CaSO4, SiO2 and/or a product containing silica or silicates such as clay, these compounds being present in the anhydrous or hydrated form. In this process, the mixture is treated up to clinkering by movement in a center of a kiln, in a sheet with approximately constant thickness, at approximately constant speed, along a treatment path having a positive temperature gradient, and for a treatment time during which the mixture remains below its melting temperature. The mixture is clinkered to produce a clinkered mixture that is cooled upon exit from the treatment path.
A process of manufacturing cement from a first raw mix including a mixture of (i) CaCO3, (ii) at least one of Al2O3 and Al(OH)3, (iii) CaSO4, and (iv) at least one of SiO2 and a product containing silica or silicates, in an anhydrous or hydrated form, the process including treating the mixture before a clinkering stage by movement in the center of a kiln, in a sheet with approximately constant thickness, at approximately constant speed, along a treatment path having a positive temperature gradient, and for a treatment time, during which the mixture remains below its melting temperature, to produce a sulfoaluminate cement, clinkering to produce a clinkered mixture, and cooling the clinkered mixture upon exit from the treatment path.
Dependencies are inferred from the claim text.