Method and device for grinding hot, wet raw material

Details Method and device for grinding hot, wet raw material Method and device for grinding hot, wet raw material

B - Operations, Transporting

02

C

B02C 15/04 (2006.01) B02C 23/26 (2006.01)

Patent

CA 2615554

The invention relates to a method and an apparatus for milling hot and wet raw materials. The invention is particularly suitable for the cement industry and for milling and simultaneously drying cement clinker, slag and aggregates. In order to increase throughput and also save energy and improve product quality, in particular in the case of blend cements, provision is made to simultaneously mill and dry the cement by supplying a cooling gas in a regulated manner to the upper part of the mill when there is a relatively high hot-gas entry temperature in the lower part of the mill. The supply of cooling gas ensures a prespecified gas/product temperature downstream of the separator and replaces the disadvantageous spraying of cooling water or considerably reduces the latter.

L'invention concerne un procédé et un dispositif pour broyer une matière première chaude et humide, et elle concerne en particulier l'industrie du ciment ainsi que le broyage et le séchage simultané de clinker, de laitier et de matériaux additionnels. L'invention vise à augmenter le rendement, économiser l'énergie et améliorer la qualité du produit, notamment pour les ciments mixtes. A cet effet, une alimentation régulée d'un gaz de refroidissement dans la partie supérieure du broyeur permet le broyage et le séchage simultanés, la température d'entrée de gaz chaud dans la partie inférieure du broyeur étant relativement élevée. L'alimentation en gaz de refroidissement permet d'obtenir une température du mélange produit-gaz définie après le passage au moulin séparateur et de remplacer ou de réduire notablement l'injection d'eau de refroidissement qui présente des inconvénients.

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