Particle dynamics during froth flotation of hardcoal determined by means of particle image velocimetry

A. Zachos; M. Kaiser; W. Merzkirch

doi:10.1117/12.150515

6 August 1993 Particle dynamics during froth flotation of hardcoal determined by means of particle image velocimetry

A. Zachos, M. Kaiser, W. Merzkirch

Author Affiliations +

Proceedings Volume 2052, Fifth International Conference on Laser Anemometry: Advances and Applications; (1993) https://doi.org/10.1117/12.150515
Event: Laser Anemometry: Advances and Applications: Fifth International Conference, 1993, Koningshof, Veldhoven, Netherlands

Abstract

As in many other branches of the raw material industry, hardcoal preparation uses froth flotation to clean its ultrafine coal fractions in the < 500 im size range (fig. 1). To this end air is fed to a suspension containing both coal and mineral particles. The separation results from the selective adhesion of the hydrophobic coal particles to air bubbles. The coallbubble aggregates having formed rise to the surface whence they are withdrawn as foam. The hydrophilic mineral particles instead remain in the sluny.1 From the dynamic point ofview there are thus two mechanisms occurring during flotation, i.e. the elementary step of coal particle/air bubbles aUachment and, secondly, the rise of the coal-laden air bubbles through the suspension towards the surface.

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A. Zachos, M. Kaiser, and W. Merzkirch "Particle dynamics during froth flotation of hardcoal determined by means of particle image velocimetry", Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); https://doi.org/10.1117/12.150515

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