Analysis of Formation and Destruction Behavior of Agglomerates of Fine Powder in Vibrating Fluidized Bed

Abstract

Recycling and reutilization of powdery/dust waste are becoming increasingly important not only for ensuring a sustainable environment, but also for decreasing the cost of waste disposal. In this regard, we have been examining component separation using a vibrating fluidized bed, based on the differences in the agglomeration properties of the particles in each component. In the proposed separation method, the knowledge of the agglomerate formation and destruction of fine particles in the fluidized bed is essential. In this study, the effects of particle properties on the agglomerate formation and destruction in the vibrating fluidized bed were investigated using custom-made apparatus. TiO₂ rutile, TiO₂ anatase, and ZnO powder were used as tested powders. Changes in powder layer height and pressure loss were measured. Based on the obtained results, changes in agglomerate size were calculated using Ergun equation, and agglomerate formation and destruction was evaluated.

Graphical Abstract

Changes in (left) the pressure drop, the bed expansion ratio, and (right) the estimated agglomerate size with treatment time (TiO₂ rutile, Amplitude 2.4 mm).