The capillary force between a bubble and a cubical particle

Gautam, Alok Sagar; Jameson, Graeme J.

doi:10.1016/j.mineng.2012.05.018

Cited by 24 publications

(28 citation statements)

References 20 publications

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“…The study by Gautam & Jameson (2012) confirmed existing knowledge that the sharp edges of particles provide much greater attachment stability at the interface. What was however concluded from this is what is potentially the most important aspect that relates to composite particle flotation, and that is that the grain edges of composite particles may act as a means of pinning the three-phase contact line to provide greater particle-bubble aggregate stability.…”

Section: Mineral and Particle Textures Based On 2d Particle Sectionalsupporting

confidence: 80%

“…Gautam & Jameson (2012) extended these types of investigations by studying cubic particles at the air-water interface.…”

Section: Mineral and Particle Textures Based On 2d Particle Sectionalmentioning

confidence: 99%

“…A review of the literature in Chapter 2 revealed evidence suggesting the spatial arrangement of exposed hydrophobic mineral grains play a role in the recovery process (Hua, et al, 2009;Gautam & Jameson, 2012;Fosu, et al, 2015a;Fosu, et al, 2015b) but that the indicators most frequently used to describe the microtexture of minerals within a particle or particle population -grain size, phase specific surface area (PSSA), intergrowth complexity, locking ratio and surface composition -do not provide a means of quantifying this characteristic for exposed grains. When air bubbles attach to mineral particle surfaces the bubbles are pinned to surface irregularities and sharp edges of these particles (Gautam & Jameson, 2012;Feng & Nguyen, 2016) and these attachment forces are greater than those exhibited by smooth surfaces or round particles.…”

Section: Introductionmentioning

confidence: 99%

“…When air bubbles attach to mineral particle surfaces the bubbles are pinned to surface irregularities and sharp edges of these particles (Gautam & Jameson, 2012;Feng & Nguyen, 2016) and these attachment forces are greater than those exhibited by smooth surfaces or round particles. For composite particles then, the edges of the exposed hydrophobic grains may act as features to pin the bubbles with the separation distance between multiple exposed hydrophobic grains still to be investigated (Gautam & Jameson, 2012). There is very little in the flotation literature that discusses the impact of the arrangement of grains on flotation separation and this clearly presents a research area of interest to strengthen the development of future property-based flotation modelling approaches and forms the basis for the research undertaken in this thesis.…”

Section: Introductionmentioning

confidence: 99%

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The effect of mineral grain textures at particle surfaces on flotation response

Vos¹

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This research investigates the contribution of the spatial arrangement of hydrophobic mineral grains at particles surface towards their flotation response and its implications for forecasting flotation response. The approach taken was to estimate this grain textural characteristic from particle sections and to identify how it affected the overall rougher and scavenger copper mineral flotation recovery from two industrial copper flotation circuits.For the second circuit the overall rougher flotation kinetic parameters for the copper mineral were also evaluated.The first contribution of this work is the demonstration that a novel textural indicator is relevant to understanding the contribution of exposed mineral grain texture on the flotation process. It is the first mineral grain textural indicator that considers both the size of the grains and the degree to which they are dispersed at the particle surface. When the indicator was applied to particle sections from flotation feed, concentrate and tail samples from two industrial copper flotation circuits, it was shown, for the first time, with confidence that while particle size and perimeter composition affect particle flotation response the spatial arrangement of the copper mineral grains at the particle surface plays a key role.For the iron-oxide-copper-gold ore, copper mineral grains in complex texture classes produced statistically higher overall rougher recoveries for the 0-20% perimeter composition class. Chalcopyrite grains in complex texture classes in the copper porphyry ore produced higher overall rougher and scavenger recoveries for the 20-40% perimeter composition class. For the 0-20% perimeter composition class statistically meaningful differences were observed for the +106 m size class. It was shown that the higher overall recoveries for the complex texture classes in this case were due to increases in the overall rougher rate of flotation, the proportions of recoverable chalcopyrite in the feed or both. For both ores the largest proportions of copper mineral within complex perimeter texture classes were within coarse particles and complex textures were less common when particle perimeters comprised more than 40% of the copper minerals. This demonstrated that in order to study the impact of this textural characteristic for the two ores it must be done within well-defined particle size and perimeter composition classes, an important outcome that has not been reported in the current literature.The second contribution is a three-step method for evaluating the flotation response of copper minerals within different grain texture classes namely; particle perimeter texture II estimation, determining coefficients of variation in the mass proportions of the target mineral within perimeter texture-composition classes and mass reconciliation and recovery calculations. Another key contribution is in applying the bootstrap resampling technique to estimate these coefficients. This demonstrated the sensitivity of seemingly feasible perimeter texture-compos...

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Section: Mineral and Particle Textures Based On 2d Particle Sectionalsupporting

confidence: 80%

“…Gautam & Jameson (2012) extended these types of investigations by studying cubic particles at the air-water interface.…”

Section: Mineral and Particle Textures Based On 2d Particle Sectionalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of mineral grain textures at particle surfaces on flotation response

Vos¹

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“…For large truncated angles, GIC determined the tenacity of the particle-meniscus contact and the stability and detachment of floating spheres, and the classical theories were invalid. The detaching force between an air bubble and a cubical particle has also shown to be influenced by the shape edge of the particle (Gautam and Jameson, 2012). Figure 8.…”

Section: Limits Of the Current Theoretical Developmentsmentioning

confidence: 99%

A review of stochastic description of the turbulence effect on bubble-particle interactions in flotation

Nguyen

An-Vo

Tran-Cong

et al. 2016

International Journal of Mineral Processing

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Flotation in mechanically agitated cells has been the workhorse of the mining industry, but our quantitative understanding of the effect of microturbulence generated by agitation on flotation is still very limited. This paper aims to review the literature on quantifying the microturbulence effects on bubble-particle interactions in flotation. The particular focus is on the stochastic description of bubble-particle interactions in the turbulent flow which is a random field. We briefly review the stochastic description of microturbulence and motions of particles of micrometre sizes and bubbles of millimetre sizes in the isotropic turbulence of mechanical flotation cells. The key starting point is the generic equation of motion, which can be decomposed into the mean turbulent variables and fluctuating turbulent variables. The turbulent flow of the carrying liquid is characterised using isotropic turbulence theory. The next focus is on reviewing bubble-particle turbulent collision and detachment interactions. Bubble-particle turbulent collision is poorly quantified; no quantitative models of the bubble-particle turbulent collision efficiency relevant for flotation are available.Current theories on bubble-particle turbulent detachment face some deficiencies. In assessing the microturbulence effect on bubble-particle detachment, the majority of studies only consider the particle acceleration in the centrifugal direction but ignore the transverse acceleration of particles, which is due to turbulent shear flow. Critically, contact angle required in quantifying the detachment is not constant, single-valued as considered in the theories, but can vary from receding to advancing value during the relaxation of the triple contact line on the particle surface. The latest experiments show that multiple-valued contact angle can significant affect stability and detachment of floating particles. Finally, quantifying the microturbulence effect on flotation requires further research.

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Liquid drop shapes on hexagonal substrates: corner dewetting in the context of vapor–liquid–solid growth of nanowires

Spencer

2024

J Eng Math

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The capillary force between a bubble and a cubical particle

Cited by 24 publications

References 20 publications

The effect of mineral grain textures at particle surfaces on flotation response

The effect of mineral grain textures at particle surfaces on flotation response

A review of stochastic description of the turbulence effect on bubble-particle interactions in flotation

Liquid drop shapes on hexagonal substrates: corner dewetting in the context of vapor–liquid–solid growth of nanowires

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