These dryers have a bed of solid particles, which are fluidized by passing a stream of air or gas upward through a specially designed perforated sheet. The upward velocity of air is so maintained so as to slightly lift the solid particles and set them in motion. This motion can be utilized to bring about mixing as well as forward movement of the solids. The air or the gas is heated and the heat is utilized to dry the solids. Fines get agglomerated to larger particles thus providing large size granules.

A vibratory motor can also be used to provide a mechanical forward motion to the fluidized solid particles.

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