Dewatering effect of fine coal slurry and filter cake structure based on particle characteristics

Fan, Yiting; Dong, Xianshu; Li, Hui

doi:10.1016/j.vacuum.2015.01.003

Cited by 42 publications

(17 citation statements)

References 13 publications

(7 reference statements)

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“…We used Büchner funnel filtration equipment as published by Fan et al [37] to carry out the filtration experiments. A schematic of the device is shown in Figure 2.…”

Section: Filtration Experimentsmentioning

confidence: 99%

Impact of Clay Minerals on the Dewatering of Coal Slurry: An Experimental and Molecular-Simulation Study

Fan

Dong

et al. 2018

Minerals

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The cleaning process of coals is challenging due to the existence of clay minerals. The overall objective of this study is to investigate how the dewatering of coal slurry is impacted by the presence of clay minerals, i.e., kaolinite and montmorillonite. Filtration tests were first conducted to investigate the effect of kaolinite and montmorillonite on the dewatering efficiency of coal. Specifically, we measured the filtration velocity, moisture, average specific resistance, and porosity of filter cakes for six slurry samples, in which different amounts of kaolinite and montmorillonite were contained. Filtration tests show that a small amount of kaolinite and montmorillonite leads to a significant reduction in the filtration velocity and porosity, and a big increase in the average specific resistance and the moisture of the filter cake. We observe that most kaolinite existed in the top and middle layers of the filter cake, while most montmorillonite existed in the top layer; on the contrary, little montmorillonite is observed in the middle and bottom layers of the filter cake. Montmorillonite results in a much more deteriorative effect than kaolinite. Considering that the interactions between clay minerals and water may play a key role, we then further investigate the effect of such interactions using molecular simulations. Simulation results show that water molecules could hardly diffuse into kaolinite from the edge, while they could readily penetrate into the montmorillonite layers from the edge surface. This result can be explained by the hydrated cation in montmorillonite. The adsorption density of water on the octahedral surface of kaolinite is higher than that of water on the tetrahedral surface of kaolinite. Furthermore, the adsorption density of water on the double surfaces of kaolinite is higher than that of water on the montmorillonite surface. This research is expected to provide benefits or contributions to the dewatering of clay-rich coal tailings.

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“…We used Büchner funnel filtration equipment as published by Fan et al [37] to carry out the filtration experiments. A schematic of the device is shown in Figure 2.…”

Section: Filtration Experimentsmentioning

confidence: 99%

Impact of Clay Minerals on the Dewatering of Coal Slurry: An Experimental and Molecular-Simulation Study

Fan

Dong

et al. 2018

Minerals

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“…Several irregularly shaped, exposed microstructures and convex particles are observed ( Figure 3-1 (a1-a4)), which are likely to become coal fines and will be examined in the following numerical studies. The size distributions of these potential fines are on the order of hundreds of nanometres to several microns, which is consistent with previous studies (Fan et al, 2015;Wei et al, 2015). Furthermore, the cleat geometries in these four images are quite different, with varying constraints, and the orientations of the cleat change at different locations.…”

Section: Cleat Geometry Determinationsupporting

confidence: 90%

“…Before introducing the theories of formation fines into CSG reservoirs, the characteristics of coal fines should be identified. Coal fines are small particles often ranging from tens of nanometres to hundreds of microns (Fan et al, 2015;Qiu et al, 2008;Wei et al, 2015;Zou et al, 2014). Wei et al (2013) indicated that the sizes of coal fines decreased as the production proceeded, meanwhile, the amount of clayey materials increased.…”

Section: Coal Fines Characteristicsmentioning

confidence: 99%

“…Coal fines are small particles frequently found in coal seams (Magill et al, 2010;Marcinew and Hinkel, 1990), and their sizes are usually between tens of nanometres and tens of microns (Fan et al, 2015;Wei et al, 2015;Zou et al, 2014). With respect to the components of coal fines, Massarotto et al (2013) employed comparative quantitative X-ray diffraction (CQ-XRD) to elucidate that coal material is still the major substance, but with higher fraction of clay minerals than coal seams.…”

Section: Chapter 3 Single-phase Flow Simulation Of Coal Fines Generatmentioning

confidence: 99%

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Integrated geomechanical, geohydraulic and geological (3G) study of coal fines generation and migration

Bai¹

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This study, considering the Geomechanical, Geohydraulic and Geological (3G) aspects, delivers fundamental understandings of coal fines generation and migration during the CSG production processes, and useful guidelines are suggested to be implemented in the field to minimize production loss induced by coal fines behaviours. v Declaration by author This thesis is composed of my original work, and contains no material previously published or written by another person except where due reference has been made in the text. I have clearly stated the contribution by others to jointly-authored works that I have included in my thesis. I have clearly stated the contribution of others to my thesis as a whole, including statistical assistance, survey design, data analysis, significant technical procedures, professional editorial advice, financial support and any other original research work used or reported in my thesis. The content of my thesis is the result of work I have carried out since the commencement of my higher degree by research candidature and does not include a substantial part of work that has been submitted to qualify for the award of any other degree or diploma in any university or other tertiary institution. I have clearly stated which parts of my thesis, if any, have been submitted to qualify for another award. I acknowledge that an electronic copy of my thesis must be lodged with the University Library and, subject to the policy and procedures of The University of Queensland, the thesis be made available for research and study in accordance with the Copyright Act 1968 unless a period of embargo has been approved by the Dean of the Graduate School.

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“…The filtration time was 10 min for all samples. A more detailed description was in our previous works (Fan et al, 2015). The time and corresponding filtrate volume were recorded to calculate the filtration velocity.…”

Section: Methodsmentioning

confidence: 99%

Effect of shear-induced breakage and reflocculation on the floc structure, settling, and dewatering of coal tailings

Fan

Song

et al. 2020

Physicochem. Probl. Miner. Process.

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Flocculation is crucial for the treatment of coal tailings in industries. In this paper, the effects of shear-induced breakage and reflocculation of the floc, settling, and dewatering of coal tailings were investigated. The results show that as shear strength increases, the settling velocity of flocculated tailings decreases. A shear rate of 200 rpm (170.6 s -1 ) leads to the loss of half the settling velocity. However, at high dosage cases, 200 rpm-300 rpm shear could improve the clarity of the supernatant. Small particles are flocculated preferentially, especially for particles below 10 µm. With the increase in dosage, the critical particle size for the occurrence of flocculation increases. The chaos index proposed can quantitatively reflect the degree of flocculation or reflocculation of coal tailings. At high dosage conditions, shear could enhance the dewatering performance of flocs by reconstructing the filter cake. Controlling the structure of flocs by dosage and shear strength can help obtain appropriate settling, clarifying, and dewatering performance of coal tailings.

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Dewatering effect of fine coal slurry and filter cake structure based on particle characteristics

Cited by 42 publications

References 13 publications

Impact of Clay Minerals on the Dewatering of Coal Slurry: An Experimental and Molecular-Simulation Study

Impact of Clay Minerals on the Dewatering of Coal Slurry: An Experimental and Molecular-Simulation Study

Integrated geomechanical, geohydraulic and geological (3G) study of coal fines generation and migration

Effect of shear-induced breakage and reflocculation on the floc structure, settling, and dewatering of coal tailings

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