Process for production of cement

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 7/44 (2006.01)

Patent

CA 2272551

ABSTRACT Disclosed herein is a process for producing cement which can reduce the content of hexavalent chromium in cement clinker without impairing the quality of the cement clinker. An atmos- phere in which the oxygen concentration is comparatively low is formed by adding a combustible material to the object to be burnt in the region from the position about four times the internal diameter of the rotary kiln away from the outlet side to the inlet of the rotary kiln, or to the object to be burnt at the inlet of the clinker cooler 4, thereby forming. The combustible material is one which burns as fast as or more slowly than the main fuel, and is coarser than the main fuel.

Un procédé de production de ciment capable de réduire le composé de chrome (VI) contenu dans un clinker, sans détériorer la qualité du clinker, consiste à ajouter une matière inflammable ayant une vitesse de combustion égale ou inférieure à la vitesse de combustion du combustible principal, et ayant une grosseur particulaire supérieure à celle du combustible principal, à une matière à cuire, à l'intérieur de la plage allant d'une position égale à environ quatre fois le diamètre D du four à l'opposé du côté d'entrée de la matière à cuire vers le côté entrée d'un four rotatif (2) jusqu'à la sortie, ou sortant au niveau d'une position d'entrée d'un refroidisseur (4) de clinker, de manière à former une atmosphère ayant une concentration d'oxygène relativement faible.

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