Particulate solids agglomeration

The most common example of dispersive mixing of particulate solid agglomerates is the dispersion and mixing of carbon black into a rubber compound. The dispersion of such a system is schematically represented in Fig. 3.22. However, the break up of particulate agglomerates is best explained using an ideal system of two small spherical particles that need to be separated and dispersed during a mixing process. 

For all those separation cases, however, which attempt to separate a particle collective according to certain properties of the particulate solids, agglomeration is most often undesired. Techniques for which this statement is true include screening, sifting, classification, sorting, flotation, and, as a general analytical method, particle size characterization. It should also be realized that the respective separation property is not only size it could be density, shape, color, chemical composition, and others. 

DISINTEGRATION, AGGLOMERATION, AND SIZE SEPARATION OF PARTICULATE SOLIDS... 

The vibrating fluidized bed is useful for processing particles that are difficult to fluidize because of stickiness, wide polydispersity, agglomerating tendency, large size, and extreme friability. High-frequency (10-100 Hz) and small-amplitude (1-10 mm) vibrations imparted to relatively shallow beds of particulate solids have been found to facilitate fluidization of difficult-to-fluidize solids. The use of such a fluidized bed for the chemical reactor has been evaluated by Mazumdar (1984). The detailed transport characteristics of a vibrating fluidized bed were recently outlined by Endesz et al. (1989). 

DISINTEGRATION, AGGLOMERATION, AND SIZE SEPARATION OF PARTICULATE SOLIDS TABLE 12.7. Some Other Kinds of Disintegrators (a) Ring Roiier Miiis to Make Down to 100 Mesh... 

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