Delving into the heterocoagulation between coal and quartz at different shear rates by the focused beam reflectance measurement (FBRM) and particle vision and measurement (PVM) techniques

Hu, Pengfei; Liang, Long; Li, Biao; Xia, Wencheng

doi:10.1016/j.fuel.2020.119445

Cited by 11 publications

(2 citation statements)

References 25 publications

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“…The in situ measurement of the chord length of aggregates was performed using a Mettler-Toledo G400 FBRM probe to monitor the real-time evolution of particle agglomeration after reagent addition [ 36 ]. Chord length data can reflect changes in particle/floc size and particle/floc number in real time.…”

Section: Methodsmentioning

confidence: 99%

The Synergistic Effects of Al3+ and Chitosan on the Solid–Liquid Separation of Coal Wastewater and Their Mechanism of Action

Chang

Dong

et al. 2022

Polymers

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It is important to identify an environmentally friendly and efficient flocculant that can replace polyacrylamide for the solid–liquid separation of coal wastewater. In this study, to explore whether chitosan can be used as an environmentally friendly and efficient flocculant for the solid–liquid separation of coal wastewater, AlCl3–chitosan was used to conduct flocculation–sedimentation and dewatering tests under different chitosan dosages and shear-strength conditions for the prepared coal wastewater. Focused beam reflectance was measured to dynamically monitor the number of refractory fine particles, and the settled flocs were photographed and analyzed with microscopy to explore the effect of AlCl3–chitosan on the flocculation settlement effect and floc characteristics. The synergistic mechanisms of AlCl3 and chitosan were investigated using quartz crystal dissipative microbalance and zeta potential measurement. The results showed that the addition of chitosan can significantly improve the flocculation–sedimentation and dewatering effects of coal wastewater. A reasonable dosage under a certain shear strength is conducive to the reduction of fine slime particles, which results in a compact floc structure, increases the floc size, and improves the settling effect. The synergistic effect of AlCl3–chitosan improved the electric neutralization and adsorption bridging abilities of the chitosan, and the mixed solution of AlCl3 and chitosan had stronger adsorption on the carbon surface. This study provides a new approach to the selection of flocculants for coal wastewater treatment.

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Section: Methodsmentioning

confidence: 99%

The Synergistic Effects of Al3+ and Chitosan on the Solid–Liquid Separation of Coal Wastewater and Their Mechanism of Action

Chang

Dong

et al. 2022

Polymers

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“…However, when investigating bubble–solid interactions, the solid surface is often considered to be chemically homogeneous. Typically, surface heterogeneity originates from crystal defects on a nanoscale, which are caused by missing or misplaced atoms in the crystal lattice, or association between various components. , On the macroscale, defects created by incomplete liberation after crushing and grinding, the adsorption of flotation reagents, the non-uniform dissociation and oxidation of surface functional groups, , or slime on the mineral surface − always induce heterogeneous. In particular, for coal, which is an organic sedimentary rock composed of inorganic and organic substances, defect-free coal surfaces are difficult to be achieved.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Heterogeneities on Interactions between Air Bubbles and Heterogeneous Surfaces

Zhi-min

Liu

et al. 2022

Langmuir

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The effects of surface heterogeneities on bubble− particle interactions have received little attention although heterogeneities are common for varieties of substance surfaces. In this work, heterogeneous surfaces consisting of discrete hydrophilic dots on a hydrophobic background were fabricated. The interactions between air bubbles and heterogeneous surfaces with different hydrophilic area fractions were investigated using a high-sensitivity microbalance coupled with a high-speed video camera. It was found that the snap-in, maximum adhesion, and pull-off forces increased as the hydrophilic area fraction decreased. These experimental results were compared with the calculated interaction forces. The comparison between experimental results and the calculated interaction forces showed that the normalized contact line length (δ) should be considered in the calculation of the snap-in force, and its value was between 1 and the δ value corresponding to the maximum pinning strength. In contrast, δ = 1 is more appropriate for the calculation of maximum adhesion force, indicating that the corrugations in the three-phase contact line could be neglected. These findings demonstrate that discrete hydrophilic defects make bubble−surface attachment difficult but have nearly no effect on bubble−surface detachment. Better understanding of the interactions between air bubbles and heterogeneous surfaces potential offers a new thought to control the bubble−particle interactions using appropriately design of particle surfaces.

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Applications of Machine Learning to Predict the Chord Length Distribution of Droplets in Oil–Water Dispersions

Liu²,

Liu³

2022

JOM

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Delving into the heterocoagulation between coal and quartz at different shear rates by the focused beam reflectance measurement (FBRM) and particle vision and measurement (PVM) techniques

Cited by 11 publications

References 25 publications

The Synergistic Effects of Al3+ and Chitosan on the Solid–Liquid Separation of Coal Wastewater and Their Mechanism of Action

The Synergistic Effects of Al3+ and Chitosan on the Solid–Liquid Separation of Coal Wastewater and Their Mechanism of Action

Effect of Surface Heterogeneities on Interactions between Air Bubbles and Heterogeneous Surfaces

Applications of Machine Learning to Predict the Chord Length Distribution of Droplets in Oil–Water Dispersions

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