I'm trying to convert a fine powder into hard granules (1mm - 3mm dia) & was trying to use a Fluidized Bed Dryer to do it. It seems to somewhat work but the granules stay crumbly & soft rather than the hard product I need. My protocol is to mix ~20% starch as a binder & then add water & fluidize the bed with 50 C air for about 30 minutes in the hope that the particles agglomerate. Any tips? What other parameters are relevant?