METHOD AND APPARATUS FOR MILLING HOT AND WET RAW MATERIALS

摘要

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.