Fluidized drum granulation : studies of agglomerate formation

摘要: Abstract Agglomerate formation in fluidized drum granulation was studied experimentally using a 0.3 m diameter laboratory granular. Glass ballotini of various sizes were coated molten paraffin wax. The effect particle size (1.5 to 8 mm), liquid spray rate (17 43 g/min) and speed (20 40 rpm) on the fraction agglomerates formed measured. controlled by collisions between wetted granules falling curtain or near zone. There is sharp transition high fractions (non-inertial regime) almost no (coating as increases. This point increases strongly with increasing but only slight function speed. These results agree, qualitatively quantitatively, regime analysis proposed Ennis. Tardos Pfeffer, Powder Technol. , 65 (1991) 257 which based balance inertial energy viscous dissipation during collision two granules. Analysis data shows characteristics velocity low, order 0.02 s −1 this consistent forming A better understanding particle-particle particle-binder interactions zone needed extend theoretical develop design scale-up rules.