Process and apparatus for preparing granulates

Details Process and apparatus for preparing granulates Process and apparatus for preparing granulates

B - Operations, Transporting

01

J

161/4

B01J 2/04 (2006.01) B01J 2/16 (2006.01) B01J 8/00 (2006.01)

Patent

CA 1257534

23189-5974 ABSTRACT OF THE DISCLOSURE The invention relates to a new process and an apparatus for carrying out the process. In the process, granulates having a narrow grain size distribution are prepared as follows: a) the product to be granulated is sprayed in liquid form into a fluidised bed, b) the proportions of fine material escaping from the fluidised bed in the off-gas are separated off and returned into the fluidised bed as nuclei for granulate formation, c) the granulation process in the fluidised bed is influenced solely by setting the classifying gas stream in such a way that granulates are formed which are of the size predetermined by the classifying gas stream, d) the completed granulate is removed solely by way of one or several countercurrent gravity classifiers which are inserted into the outflow bottom of the fluidised-bed apparatus, and e) if desired the granulates thus obtained are subjected to a thermal aftertreatment.

478357

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