The use of the froth surface lamellae burst rate as a flotation froth stability measurement

Morar, Sameer H.; Bradshaw, Dee; Harris, Mary

doi:10.1016/j.mineng.2012.03.018

Cited by 33 publications

(9 citation statements)

References 14 publications

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“…Moreover, it disperses air into the pulp, 6,7 controls the bubble size by preventing bubble coalescence, 8,9 regulates the bubble shape and velocity, 10 and selectively promotes the partitioning of minerals back to the pulp phase 11 . Therefore, the frother is related to the flotation performance and has a significant effect on the recovery and product grade by increasing the froth stability and decreasing the entrainability, respectively 12–17 …”

Section: Introductionmentioning

confidence: 99%

Froth stability and entrainment evaluation of a novel frother for KCl/NaCl flotation

Wang

Song

2023

AIChE Journal

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The rate of KCl recovery by froth flotation using low-grade carnallite is 70%-85%.Herein, a novel frother, dipropylene glycol butyl ether (DPNB), was prepared to increase the flotation efficiency of KCl recovery systems. DPNB could be applied at only half the dosage of the conventional frother methyl isobutyl carbinol (MIBC) and achieve a KCl recovery rate of 94.8%-98.6% with a high KCl grade (63.2%-66.5%).To date, these results are the best reported for pneumatic flotation. DPNB had a 10% higher maximum dynamic stability factor compared with MIBC; moreover, the apparent entrainment velocity of DPNB was half that of MIBC. The molecular structure of DPNB had hydroxyl and ether groups, which promoted interactions with water, thereby contributing to its excellent froth stability. DPNB is environment friendly owing to its low volatility and, thus, a promising frother for the green and highly efficient flotation of KCl/NaCl.

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Section: Introductionmentioning

confidence: 99%

Froth stability and entrainment evaluation of a novel frother for KCl/NaCl flotation

Wang

Song

2023

AIChE Journal

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“…The watershed algorithm is an effective algorithm for segmenting froth images. However, this algorithm is easily affected by the noise, quantization error and texture details of region [5,6], so over-segmentation and under-segmentation can be found in the segmentation result. The marker-based watershed algorithm solved this weakness to some extent [7–9], and Yang et al [10] proposed an improved watershed method based on clustering pre-segmentation and high-low scale distance reconstruction for froth images.…”

Section: Introductionmentioning

confidence: 99%

A fast threshold segmentation method for froth image base on the pixel distribution characteristic

Xie

et al. 2019

PLoS ONE

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With the increase of the camera resolution, the number of pixels contained in froth image is increased, which brings many challenges to image segmentation. Froth size and distribution are the important index in froth flotation. The segmentation of froth images is always a problem in building flotation model. In segmenting froth images, Otsu method is usually used to get a binary image for classification of froth images, this method can get a satisfactory segmentation result. However, each gray level is required to calculate each of the between-class variance, it takes a longer time in froth images with a large number of pixels. To solve this problem, an improved method is proposed in this paper. Most froth images have the pixel distribution characteristic that the gray histogram curve is a sawtooth shape. The proposed method uses polynomial to fit the curve of gray histogram and takes the characteristic of gray histogram's valley into consideration in Otsu method. Two performance comparison methods are introduced and used. Experimental comparison between Otsu method and the proposed method shows that the proposed method has a satisfactory image segmentation with a low computing time.

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“…The performance of the separation is dependent on the stability of the overflowing froth phase, where operating under conditions that yield stable froths results in improved mineral recovery [1,2]. Froth stability can be described in a number of ways, including bubble burst rate [3], air recovery [1] and the froth stability column [4].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Particles on Surface Tension and Flotation Froth Stability

Hadler

Cilliers

2018

Mining, Metallurgy & Exploration

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It is widely accepted that particles stabilise flotation froths and that stable froths result in improved flotation performance. Predicting the effect of particle addition on froth stability is, however, challenging. Dynamic surface tension measurement using maximum bubble pressure presents an attractive technique to investigate the effect of surfactant and particles at the air-water interface. The range of bubble lifetimes that can be studied (typically 0.1 to 60 s) is analogous to variations in air rate in flotation cells, and the corresponding changes in surface tension give an indication to the diffusion and adsorption rates of particles at the interface. In this paper, we use dynamic surface tension measurements to investigate the effect of particles on bubble surfaces at the microscale and link this to bulk froth stability measurements carried out using a froth column. Using the maximum bubble pressure method, the results show that the addition of particles results in lower surface tension, both at the dynamic (i.e. short) bubble lifetimes and towards equilibrium (i.e. 60 s bubble lifetime). This corresponds with the bulk froth stability measurements, where the three-phase system yielded more stable froths than the surfactant only system. Furthermore, increased particle loading at the air-water interface, whether through higher surfactant concentrations or lower air rates (longer bubble lifetimes), gave lower surface tension and higher froth stability. This demonstrates the link between bubble loading and froth stability. It is proposed that the maximum bubble pressure technique can be used to predict froth stability for two-and three-phase systems, enabling the effect of particle loading to be accounted for and quantified. Moreover, the technique has the potential to allow rapid determination of particle and surfactant diffusion at the air-water interface and prediction of the corresponding effect on bulk froth behaviour.

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The use of the froth surface lamellae burst rate as a flotation froth stability measurement

Cited by 33 publications

References 14 publications

Froth stability and entrainment evaluation of a novel frother for KCl/NaCl flotation

Froth stability and entrainment evaluation of a novel frother for KCl/NaCl flotation

A fast threshold segmentation method for froth image base on the pixel distribution characteristic

The Effect of Particles on Surface Tension and Flotation Froth Stability

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