Spray particle creation

Agglomeration (UNIT OPERATION) generic term in process engineering for all unit operations which enlarge the particle size of a dispersed system by the creation of particle — agglomerates—e.g. spray drying, granulation in dmms, and compaction of powders. 

Despite Tab. 7.2, powders can be the preferred product form for various applications, due, for example, to their high volume-specific surface area and the resulting high reactivity. Even ultra-fine powders can be produced in spray fluidized beds. For this purpose, one follows Fig. 7.1c. However, the coating is created with the sole purpose of its subsequent in situ destruction by particle-particle collisions. The material created by attrition is now the real product of the process, which is carried out of the fluidized bed by the gas and can be collected in a cyclone or in filter bags. The core particles are carriers for the coating and, simultaneously, the promoters of its destruction, so that they have to be heavy and rigid. Metallic carrier particles can be heated by wall contact or by induction, so that the creation of ultra-fine powder can be combined with its thermal treatment. 

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