| 摘要 |
<p>1. Process for the continuous preparation of granules having a narrow particle size distribution, characterized in that a) the product to be granulated is sprayed into a fluidized bed from below in liquid form by means of a spraying nozzle, b) the fine material escaping from the fluidized bed with the off-gas is separated off and returned to the fluidized bed as nuclei for the granule formation, c) the granulation process in the fluidized bed is influenced so that granules of the size predetermined by the sifting gas stream are formed simply by adjusting the sifting gas stream, and d) the finished granules are discharged simply via one or more countercurrent gravity sifters installed in the inflow plate of the fluidized bed apparatus and e) if appropriate, the granules thus obtained are subjected to a thermal aftertreatment.</p> |
