Alteration of the equal settling ratio of fine particles by vertically-oscillating water

Tatsuya Oki, Mikio Kobayashi, Shuji Owada, Daiki Matsuura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

An equal settling ratio is an important factor in estimating particle separation accuracy. However, this factor is often calculated using the settling velocity in stationary water, there are no examples of calculation of the equal settling ratio in an actual separator. This is difficult because particle movement in a separator is very complicated, and even simple periodic motions, such as the oscillation field used with many separators, are ignored in many cases. The authors have previously reported on the relation between the equal settling ratio and the oscillation frequency by analysis of particle movement in vertically oscillating water, using spherical particles of glass (average size 435 μm) and zirconia (202 μm) which have the same settling velocity in stationary water. In this study, the influence of particle diameter on the change in the settling velocity in oscillating water was experimentally investigated for three pairs of glass and zirconia particles having different sizes under 0.5 mm, which have the same settling velocity in stationary water. The settling velocities of different-sized particles decreased at different rates in oscillating water, indicating that the equal settling ratio is reduced by water oscillation. We conclude that water oscillation improves the accuracy of size separation for glass particles over 300 μm and zirconia particles over 150 μm when glass and zirconia particles are separated from each other with the difference of these settling velocities.

Original languageEnglish
Pages (from-to)69-79
Number of pages11
JournalInternational Journal of Mineral Processing
Volume82
Issue number2
DOIs
Publication statusPublished - 2007 Mar 1

Keywords

  • Equal settling ratio
  • Gravity concentration
  • Oscillation
  • Particle size
  • Particles
  • Settling velocity

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geochemistry and Petrology

Fingerprint Dive into the research topics of 'Alteration of the equal settling ratio of fine particles by vertically-oscillating water'. Together they form a unique fingerprint.

Cite this