Control of apparent specific gravity in binary particle systems of gas-solid fluidized bed

Mikio Yoshida, Jun Oshitani, Keiko Ono, Miki Ishizashi, Kuniaki Gotoh

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Fluidized bed medium separation (FBMS) was applied to separate objects with a small specific gravity difference by precisely controlling the apparent specific gravity of gas-solid fluidized bed with binary particle systems. The binary systems of particles with various specific gravities and diameters were employed, and the apparent specific gravity of fluidized bed, gfb, and fluctuation, Δgfb, were measured by changing the volume mixing rati of heavier particle, Vhp, and the superficial air velocity, u0. It was found that gfb can be controlled by Vhp and u0 because gfb varies with the total mass of particles and bed expansion. On the other hand, since Δgfb is determined by the extent of segregation of fluidized particles and fluidization intensity,Δgfb decreases with reducing the extent of the segregation and the vertical fluctuation of fluidized bed surface. The experimental results showed that practical fluidized conditions for FBMS are in the wide range of gfb ≈ 0.5-3.8 and Δgfb ≤ about 0.1. Under these fluidized conditions, plastics with a small difference in specific gravity (0.04-0.24) were almost completely separated at the top and bottom of the fluidized bed.

Original languageEnglish
Pages (from-to)227-237
Number of pages11
JournalKONA Powder and Particle Journal
Volume26
Issue numberMarch
DOIs
Publication statusPublished - Jan 1 2008

Keywords

  • Binary particle systems
  • Dry gravity separation
  • Floating and sinking
  • Fluidized bed
  • Segregation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Engineering(all)

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