Kinetics of bubble-particle attachment and detachment at a single-bubble scale

Yang, Haichang; Xing, Yaowen; Sun, Lijuan; Cao, Yijun; Gui, Xiahui

doi:10.1016/j.powtec.2020.05.064

Cited by 21 publications

(4 citation statements)

References 31 publications

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“…The degree of adhesion between the bubble and coal sample can directly reflect the floatability of coal samples. The interaction between the air bubble and coal surface under different collectors could reveal the performance of the collector on the coal surface [40]. In this study, the force curves of the interaction between bubbles and coal surfaces were investigated at different collector dosages of 500, 1000, 2000 and 4000 g/t, under varying concentrations of diesel and 1030# as shown in Figures 9 and 10.…”

Section: Surface Wettability Test Resultsmentioning

confidence: 99%

Enhancing Flotation Performance of Low-Rank Coal Using Environment-Friendly Vegetable Oil

Xu,

Zhou,

Hao

et al. 2023

Minerals

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Flotation is widely used for low-rank coal upgrading, although it is always inefficient due to its rough surface morphology and rich oxygen-containing functional groups. In this study, the environment-friendly vegetable oil 1030# was used to enhance the flotation performance of low-rank coal. The mechanism of 1030# enhancing the flotation of low-rank coal was revealed through surface property analysis of coal particles and bubble–particle adhesion tests. The flotation results showed that the flotation yield of low-rank coal increased with the increase in the collector dosage, and the flotation yield of 1030# as a collector is obviously higher than that of diesel. Scanning electron microscopy (SEM) and chromatography–mass spectrometry (GC-MS) were used to analyze the surface morphology of coal particles and components of the reagent. The SEM results showed that the surface of low-rank coal is loose and contains a large number of pores and cracks, which is not conducive to the spreading of chemicals on the coal surface and the mineralization of bubbles and particles. GC-MS results showed that 1030# mainly contained methyl oleate with more unsaturated double bonds than diesel. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to analyze the surface functional groups of the low-rank coal before and after reagent treatment. The results of FTIR and XPS showed that the coal surface of low-rank coal before reagent treatment contained a large number of oxygen-containing functional groups with poor surface hydrophobicity, while the surface of low-rank coal after reagent treatment had reduced oxygen-containing functional groups and increased hydrophobicity. The contact angle of the low-rank coal surface also showed the same variation trend as the FTIR and XPS results. The adhesion force between the bubble and coal surface in different collector solutions was measured. The maximum adhesion between the bubble and coal surface increased with the increase in the collector, and the maximum adhesion force with 1030# treatment was higher than that of diesel. This indicated that 1030# with a large number of polar components is more easily spread on the surface of low-rank coal, thus improving the hydrophobicity of low-rank coal.

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Section: Surface Wettability Test Resultsmentioning

confidence: 99%

Enhancing Flotation Performance of Low-Rank Coal Using Environment-Friendly Vegetable Oil

Xu,

Zhou,

Hao

et al. 2023

Minerals

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“…It was concluded that both the classical first-order model and the first-order model with rectangular distribution fitted the experimental results well, as high R 2 values indicated that the attaching experiments could offer evidence as to the flotation behavior of molybdenite. Higher S p∞ and k a values indicated better floatability in the flotation process [31,32]. The addition of both kerosene and KCTC increased the coverage area and attaching rates of molybdenite particles to bubbles.…”

Section: Bubble-particle Attachment Analysismentioning

confidence: 96%

“…Attaching kinetics were used to analyze the attaching rate of molybdenite particles on bubbles, which indicated the floatability of mineral particles [30]. The flotation kinetic models, the classical first-order model, and the first-order model with rectangular distribution were employed to fit the attaching kinetics of molybdenite particles to the bubble [30,31]. The fitting curves of the coverage area and results are shown in Figures 7 and 8, and Table 3.…”

Section: Bubble-particle Attachment Analysismentioning

confidence: 99%

Enhanced Flotation Recovery of Fine Molybdenite Particles Using a Coal Tar-Based Collector

Chao¹,

Gao

et al. 2021

Minerals

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Low flotation efficiency has always been a problem in the separation of low-grade molybdenum ores because of the finely disseminated nature and crystal anisotropy of molybdenite. In this study, a novel kerosene–coal tar collector (KCTC) was prepared and used to explore the feasibility of improving the recovery of fine molybdenite particles. The results showed that KCTC achieved better attaching performance than that shown by kerosene, and the surface coverage and attaching rate constant were improved significantly, especially for finer particles of −38 + 20 μm. Compared with kerosene, KCTC showed more affinity for molybdenite particles and greater adsorbed amounts of KCTC on molybdenite particles were achieved. Moreover, the composite collector was shown to float single molybdenite particles of different sizes, and it was found that the recovery of molybdenite particles of different sizes, particularly in the case of those at −20 μm, was improved dramatically by KCTC. The flotation results of actual molybdenum ores further confirmed that KCTC was beneficial to flotation recovery and the selectivity of molybdenite. This indicated that KCTC is a potential collector for the effective flotation of low-grade deposits of molybdenum ores, and more studies should be conducted on further use in industrial practice.

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“…Other prominent material groups together with their respective surfactant system showing specific chemical effects, which might influence the bubble-particle attachment mechanisms are sulfides (Albijanic et al, 2012(Albijanic et al, , 2011October et al, 2020;Sarvaramini et al, 2016;Xianchen Wang & Zhang, 2020), semi-soluble salt type minerals (Tang et al, 2020;Wang & Zhang, 2020;Yang et al, 2020) and iron oxides (Joseph-Soly et al, 2015;Ma, 2012;Pattanaik & Venugopal, 2018).…”

Section: Aspects In Flotationmentioning

confidence: 99%

Proposition of a bubble-particle attachment model based on DLVO van der Waals and electric double layer interactions for froth flotation modelling

Buchmann¹,

Öktem²,

Rudolph³

et al. 2022

Physicochem. Probl. Miner. Process.

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The attachment of bubbles and particles represents one of the sub-processes in froth flotation among others (e.g. collision and detachment). The main interactions present at short distances in such a bubble-particle system are the van der Waals and electrostatic double layer interactions combined in the DLVO theory. In this study, the special features of the attachment process were discussed with a focus on flotation. For the van der Waals interactions, the Hamaker constants were calculated with the help of Lifshitz´ macroscopic theory as a function of the separation distance for specific material combinations. A specific material system (PbS-Water-Air) was used to demonstrate the implementation of bubble-particle attachment of the proposed modelling framework. The effects of additional surfactant/collector and air layers on the solid interface were presented. This framework of layered systems showed that the sign of van der Waals interaction could be turned from repulsive to attractive without the need to extend the DLVO theory. The thickness of the layer as a function of collector adsorption between a particle and a bubble is suggested as a modelling parameter in bubble-particle attachment efficiency.

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Kinetics of bubble-particle attachment and detachment at a single-bubble scale

Cited by 21 publications

References 31 publications

Enhancing Flotation Performance of Low-Rank Coal Using Environment-Friendly Vegetable Oil

Enhancing Flotation Performance of Low-Rank Coal Using Environment-Friendly Vegetable Oil

Enhanced Flotation Recovery of Fine Molybdenite Particles Using a Coal Tar-Based Collector

Proposition of a bubble-particle attachment model based on DLVO van der Waals and electric double layer interactions for froth flotation modelling

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