Particle motion analysis of a new three-phase fluidized bed flotation column with glass sphere particles

Analysis of the particle movement within the unit vessel is necessary for the design, optimization and scale-up of the new three-phase fluidized bed flotation column (TFC). This work aimed to examine the motion and distribution of assisted fluidized particle-glass spheres in the TFC and to provide a better assessment of particle collision and dispersion behavior by quantifying particle velocities. Tracer particles were analyzed by high-speed camera techniques to determine particle velocity fluctuations in a three-phase fluidized bed consisting of glass spheres, water, and bubbles. A correlation model for determining the particle velocity in a three-phase fluidized bed is proposed after a systematic analysis of the particle velocity. The model covers a wide range of superficial gas velocities (0-0.339 m/s), superficial liquid velocities (0.169-0.425 m/s) and initial static bed heights (0.162-0.262 m). Aiming to evaluate particle collisions in the TFC, this paper derives the particle collision frequencies using a modified collision model and investigates the effect of a wide range of operating parameters on particle collisions. Finally, a new method for estimating dispersion due to particle motion is developed based on the study of particle dis-persion coefficients.(c) 2023 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.

Automated summary

Analysis of the particle movement is necessary for the design, optimization, and scale-up of the new three-phase fluidized bed flotation column (TFC). In this study, the motion and distribution of assisted fluidized particle-glass spheres in the TFC were examined, and particle velocities were quantified to better assess particle collision and dispersion behavior. A correlation model for particle velocity in a three-phase fluidized bed was proposed, covering a wide range of operating parameters. Particle collision frequencies and dispersion coefficients were also investigated, leading to the development of a new method for estimating dispersion due to particle motion.