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Wetting film stability and flotation kinetics.

J Ralston1, S S Dukhin, N A Mishchuk

  • 1Ian Wark Research Institute, University of South Australia, Adelaide, Australia. john.ralston@unisa.edu.au

Advances in Colloid and Interface Science
|February 15, 2002
PubMed
Summary

Wetting film stability (WFS) dictates two flotation dynamics modes. Low WFS promotes attachment on first collision, while high WFS leads to rebound and attachment on subsequent collisions, impacting collection efficiency.

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Area of Science:

  • Surface Science and Colloids
  • Chemical Engineering
  • Mineral Processing

Background:

  • Surfactants and impurities typically hinder bubble surface movement, suppressing particle-bubble inertial interactions in flotation.
  • Superclean water enables free bubble surface movement, enhancing inertial interactions and leading to distinct flotation dynamics.

Purpose of the Study:

  • To investigate the influence of wetting film stability (WFS) on flotation dynamics and collection efficiency (Ecoll).
  • To explore particle-bubble interactions and attachment mechanisms under varying WFS conditions in superclean water.

Main Methods:

  • Single bubble experiments using quartz particles of varying sizes and known contact angles in superclean water.
  • Measurement of collection efficiency (Ecoll) under conditions of high and low wetting film stability (WFS).

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  • Development and validation of a generalized Sutherland equation (GSE) incorporating hydrodynamic forces and drainage.

    • Main Results:

    • Two flotation modes were identified: monotonic Ecoll increase with particle size at low WFS, and extreme Ecoll dependence at high WFS.
    • Low WFS facilitates attachment on the first collision due to rapid film rupture and contact angle formation.
    • High WFS leads to rebound, with attachment occurring on subsequent collisions, significantly reducing efficiency.

    Conclusions:

    • Wetting film stability is a critical determinant of flotation dynamics and mechanisms.
    • The generalized Sutherland equation (GSE) accurately describes low WFS flotation, while a modified GSE predicts high WFS behavior.
    • Rebound at high WFS can decrease attachment efficiency by over 30%, influencing the upper boundary of the flotation domain.