Influence of coal particles on froth stability and flotation performance

Liang, Long; Li, Zhiyuan; Peng, Yaoli; Tan, Jiakun; Xie, Guangyuan

doi:10.1016/j.mineng.2015.07.004

Cited by 50 publications

(11 citation statements)

References 38 publications

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“…However, an increase in the impeller speed in a smaller cell can negatively impact the flotation rate for coarser particles, as the energy dissipated into the system will be high and enhance the detachment of particles from bubbles [25]. Many researchers concluded that the maximum flotation rate is achieved for the intermediate particle size range [53][54][55]. However, it is difficult to practice in the industry with proper techno-economics.…”

Section: Evaluation Of Flotation Rate Constantmentioning

confidence: 99%

Influence of impeller speed and cell volume on coal flotation performance in a self-aerating flotation machine

Anzoom¹,

Tripathy²,

Sahu³

et al. 2020

Advanced Powder Technology

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Section: Evaluation Of Flotation Rate Constantmentioning

confidence: 99%

Influence of impeller speed and cell volume on coal flotation performance in a self-aerating flotation machine

Anzoom¹,

Tripathy²,

Sahu³

et al. 2020

Advanced Powder Technology

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“…Recently, Liang et al (2015) showed that varying the hydrophobicity and proportion of fine coal particles affects their ability to stabilise the froth. An intermediate particle size of 74 -250 µm resulted in the deepest and most stable froths.…”

Section: Introductionmentioning

confidence: 99%

The effect of particle size distribution on froth stability in flotation

Norori-McCormac

Brito-Parada

Hadler

et al. 2017

Separation and Purification Technology

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Separation of particles of different surface properties using froth flotation is a widely-used industrial process, particularly in the minerals industry where it is used to concentrate minerals from ore. One of the key challenges in developing models to predict flotation performance is the interdependent nature of the process variables and operating parameters, which limits the application of optimising process control strategies at industrial scale. Froth stability, which can be quantified using air recovery (the fraction of air entering a flotation cell that overflows in the concentrate as unburst bubbles), has been shown to be linked to flotation separation performance, with stable froths yielding improved mineral recoveries. While it is widely acknowledged that there is an optimum particle size range for collection of particles in the pulp phase, the role of particle size on the measured air recovery and the resulting link to changes in flotation performance is less well understood. This is related to the difficulty in separating particle size and liberation effects.In this work, the effects of particle size distribution on air recovery are studied in a single species (silica) system using a continuous steady-state laboratory flotation cell. This allows an investigation into the effects of particle size distribution only on froth stability, using solids content and solids recovery as indicators of flotation performance. It is shown that, as the cell air rate is increased, the air recovery of the silica system passes through a peak, exhibiting the same froth behaviour as measured industrially. The air recovery profiles of systems with three different particle size distributions (d80 of 89.6, 103.5 and 157.1 m) are compared. The results show that, at lower air rates, the intermediate particle size distribution (103.5 m) yields the most stable froth, while at higher air rates, the finest particles (89.6 m) result in higher air recoveries. This is subsequently linked to changes in flotation performance. The results presented here highlight, for the first time, the link between particle size distribution in flotation feeds, air recovery and flotation performance. The results demonstrate that there is an optimal air rate for each particle size distribution, therefore changes in particle size distribution in the feed to flotation cells require a change in air rate in order to maximise mineral recovery.

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“…Coarse particles have little effect on the bubbles stability [45]. Therefore, the optimal proportion of -0.074 mm particles for this fine coal in flotation was also explored and the moderate value was found to be about 40%, which was similar with the proportion in raw coal.…”

Section: Classified Flotationmentioning

confidence: 80%

Effective Beneficiation of a Fine Coking Coal Using a Novel Flotation Scheme

Gao

Cao³

et al. 2016

International Journal of Coal Preparation and Utilization

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Effective flotation of fine coal remains challenging due to flotation inefficiency of coarse,intergrowth particles and contamination due to fine particles. In this paper, a novel flotation scheme, named split-conditioning and bulk-flotation (SCBF) has been proposed to improve flotation efficiency of coarse and fine particles. The conditioning time and impellor speed of flotation machine for coarse and fine particles were optimized using the nine well-planed orthogonal experiments. The results demonstrated that using the SCBF approach, an increase of 12.43% recovery for +0.074 mm particles and a decrease of 2.42% ash content in the -0.074 mm Downloaded by [University of Nebraska, Lincoln] atA c c e p t e d M a n u s c r i p t 2 fractions were obtained compared to the conventional flotation. Based on the orthogonal experiments analysis, the optimal mixing conditions for +0.074 mm particles were the impellor speed of 2100 rpm and conditioning time of 240 s, whereas for the -0.074mm size particles impellor speed of 2100 rpm and conditioning time of 60 s were found to be the most important factor in the SCBF. It was found that for +0.074 mm particles higher impellor speed and longer conditioning time improved the recovery of coarse particles, and shorter conditioning time for -0.074 mm particles reduced the contamination in clean coal.

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Influence of coal particles on froth stability and flotation performance

Cited by 50 publications

References 38 publications

Influence of impeller speed and cell volume on coal flotation performance in a self-aerating flotation machine

Influence of impeller speed and cell volume on coal flotation performance in a self-aerating flotation machine

The effect of particle size distribution on froth stability in flotation

Effective Beneficiation of a Fine Coking Coal Using a Novel Flotation Scheme

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