Surface properties of aged coal and their effects on bubble–particle attachment during flotation

Zhou, You; Albijanic, Boris; Tadesse, Bogale; Wang, Yuling; Yang, Junxiao; Zhu, Xiangnan

doi:10.1016/j.apt.2020.01.029

Cited by 22 publications

(9 citation statements)

References 45 publications

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“…18 The binding energies were calibrated by the C 1s peak, corresponding to the graphitic carbon at 284.80 eV. 27 Then, MultiPak software was employed to fit the XPS spectra. The Si element, which belonged to coal particles instead of the NSF dispersant, was identified as the characteristic element.…”

Section: Thickness Of Adsorption Layer Measurementsmentioning

confidence: 99%

Insights into the Dispersion Mechanism of Microfine Coal Particles Modified with Naphthalene Sulfonate Formaldehyde Based on EDLVO Theory

et al. 2023

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Coal water slurry (CWS) fuel prepared using microfine coal particles with a size distribution of 1–10 μm is a promising way to cleanly utilize solid resources in engines, even catering a popular application for clean coal technology. In an attempt to address the problems in coal aggregation in microfine coal water slurry (MCWS), dispersants are used to improve the dispersing status of microfine coal particles. Based on the experimental results and extended Derjaguin–Landau–Verwey–Overbeek (EDLVO) theory calculations, the role of naphthalene sulfonate formaldehyde (NSF) in MCWS performance was explored. The measurement of the slurry ability of microfine coals demonstrated that the apparent viscosity and yield stress of MCWS were decreased significantly with 1.5% NSF addition, which was consistent with the saturated adsorption value of NSF on microfine coals. Furthermore, the ζ-potential and contact angle of microfine coals were both decreased as a function of the NSF dosage, indicating that a larger electrostatic repulsion force and better wetting ability of the coal surface would be obtained in the presence of NSF. The thickness calculation results showed that the thickness is increased with NSF addition, which is attributed to that the NSF molecule extends into the surrounding solution to form a hydrophilic film. The EDLVO calculations illustrated that the total interaction was turned from an attractive force into a repulsive force in the case of NSF, noting that the better dispersion of microfine coals mainly resulted from the better hydrophilicity of the coal surface modified with NSF. The findings might provide guidance for MCWS preparation by revealing the interaction mechanism of microfine coals modified with NSF.

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Section: Thickness Of Adsorption Layer Measurementsmentioning

confidence: 99%

Insights into the Dispersion Mechanism of Microfine Coal Particles Modified with Naphthalene Sulfonate Formaldehyde Based on EDLVO Theory

et al. 2023

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“…After theoretical analysis, (5) shows that the distance of the object thrown from the belt is related to the belt velocity and height of the gangue. To ensure that gangue at different belt speeds can be sorted to the appropriate position, it is necessary to analyze the distance of gangue horizontal movement under different belt speeds.…”

Section: ) Influence Of Different Belt Speeds On Separation Distancementioning

confidence: 99%

“…According to (5), the different heights of gangue will have a certain influence on the horizontal movement distance at the same belt speed. The higher the height of the gangue is, the farther the horizontal movement distance.…”

Section: ) Influence Of Different Gangue Heights On Separation Distancementioning

confidence: 99%

“…Equation (5) shows that the horizontal movement distance of gangue before blowing is independent of the diameter of gangue. In this regard, gangue with diameters of 50 mm, 100 mm and 150 mm is selected for three postures to carry out experimental verification.…”

Section: ) Influence Of Different Gangue Diameters On Separation Distancementioning

confidence: 99%

“…The manual sorting method is gradually eliminated because of its poor working environment and low efficiency. Mechanical washing mainly includes the heavy medium method [3], jigging method [4] and flotation method [5], which have problems such as easy loss of separation equipment, waste of water resources, increase in production cost caused by drying treatment and medium recovery [6], [7]. The ray recognition [8] method is harmful to the human body, and the mechanical vibration [9] method is only applicable to a few scenes.…”

Section: Introductionmentioning

confidence: 99%

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An Online Flexible Sorting Model for Coal and Gangue Based on Multi-Information Fusion

et al. 2021

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Coal is an important energy source in China. The separation of coal and gangue is a key link in coal mining, and the realization of the intelligent separation of coal and gangue provides technical support to promote the intelligent development of coal mines. To solve the problem of difficult to sort coal and gangue quickly and accurately caused by the fast running speed of belt, the different shapes and sizes of gangue and so on, an online flexible sorting model based on multi-information fusion is proposed. We use a near-infrared camera to identify coal and gangue, and combine it with a depth camera to obtain the height and pose information of gangue. According to the information obtained by the camera, the flexible sorting of coal and gangue can be realized. We also analyzed the different factors that affect the trajectory of gangue before and after pneumatic separation, deduced the theoretical formula of horizontal movement distance of gangue pneumatic separation, established the mathematical model of gangue flexible sorting, and carried out experiments of pneumatic separation with different shapes and sizes of gangue. The error compensation of the model is carried out by using experimental data. Through experimental verification, the proposed gangue flexible sorting model can effectively improve the accuracy of gangue sorting and can still accurately sort gangue of different shapes and sizes despite the high-speed movement of the belt.

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Understanding of attachment efficiency and induction time between bubbles and pyrite particles in flotation

Zhou

Albijanic

Panjipour

et al. 2021

Advanced Powder Technology

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Surface properties of aged coal and their effects on bubble–particle attachment during flotation

Cited by 22 publications

References 45 publications

Insights into the Dispersion Mechanism of Microfine Coal Particles Modified with Naphthalene Sulfonate Formaldehyde Based on EDLVO Theory

Insights into the Dispersion Mechanism of Microfine Coal Particles Modified with Naphthalene Sulfonate Formaldehyde Based on EDLVO Theory

An Online Flexible Sorting Model for Coal and Gangue Based on Multi-Information Fusion

Understanding of attachment efficiency and induction time between bubbles and pyrite particles in flotation

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