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Particle-bubble collision models--a review

Dai1, Fornasiero, Ralston

  • 1Ian Wark Research Institute, University of South Australia, Mawson Lakes, Australia.

Advances in Colloid and Interface Science
|April 18, 2000
PubMed
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This study reviews particle-bubble collision models, finding the Generalised Sutherland Equation best predicts experimental results for quartz particles. Differences arise from bubble surface mobility and particle inertia.

Area of Science:

  • Mineral Processing
  • Fluid Dynamics
  • Surface Science

Background:

  • Accurate prediction of particle-bubble collision efficiency is crucial for optimizing froth flotation processes.
  • Existing models for collision efficiency vary due to differing assumptions regarding hydrodynamics and particle/bubble characteristics.
  • Experimental validation is needed to assess the reliability of theoretical collision models.

Purpose of the Study:

  • To critically review existing models for calculating particle-bubble collision efficiency.
  • To experimentally determine collision efficiencies for quartz particles with single bubbles.
  • To validate and compare various collision models using experimental data.

Main Methods:

  • Literature review of particle-collision models with varying hydrodynamic assumptions.

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  • Experimental flotation of quartz particles under conditions favoring high attachment and stability efficiencies.
  • Comparison of experimental collision efficiencies with predictions from multiple theoretical models.

    • Main Results:

    • All reviewed models indicate collision efficiency increases with particle size, but with different dependencies.
    • Experimental collision efficiencies for quartz particles were obtained.
    • Only the Generalised Sutherland Equation showed good agreement with experimental data.
    • Model discrepancies were attributed to bubble surface mobility and particle inertial forces.

    Conclusions:

    • The Generalised Sutherland Equation is a more reliable model for predicting particle-bubble collision efficiency in flotation.
    • Bubble surface mobility and particle inertia are key factors influencing collision dynamics.
    • Further refinement of models should incorporate these dynamic factors for improved accuracy.