Interaction between STAC and coal/kaolinite in tailing dewatering: An experimental and molecular-simulation study

Chen, Ruxia; Dong, Xianshu; Ma, Xiaomin; Dong, Yingdi; Chang, Ming Wei

doi:10.1016/j.fuel.2020.118224

Cited by 39 publications

(11 citation statements)

References 57 publications

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“…Therefore, depression deposits were formed in the Datong in the mid-northern part of NCC (Figure 1), which began accepting the deposition of the late Paleozoic era. As part of the ate Paleozoic era giant coal-accumulating basin in In recent years, coal-measure kaolinite rocks and their application have garnered increasing research attention [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], particularly in relation to mineral content and composition, rock type, formation conditions, provenance and geochemistry using diverse methods [1][2][3][4][5][6][7][8][9][10], and kaolinite in mineral synthesis has been used in various applications [14][15][16][17]. In-situ alterations in mafic pyroclastic material may produce kaolinite rock, whereas volcanic tuff is transformed into kaolinite rock by acids from peatification of sphagnum overburdening [5,18].…”

Section: Geological Backgroundmentioning

confidence: 99%

“…As we know, the intercalation composites formed by kaolinite have shown unique properties in mechanics, adsorption, electricity and catalysis, and have broad application prospects in the fields of functional ceramics, nonlinear optical materials, polymer matrix composites and electrorheological fluids [14,17,24]. Additionally, crystallinity has an important effect on the intercalation of kaolinite, and the disordered structure is not conducive to intercalation.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The characteristics of the original sedimentary environment indicated that the sediment of the roof, floor and gangue of No.8 and No.5 coal seams would undergo a stronger filtering effect and retain more stable minerals debris and less clay debris. This feature is more obvious as it is closer to the lower stratum., Due to the higher Si-bearing sedimentary resource background, which struggles to form stable TOa-type clay mineral kaolinite, the static water and low energy environment formed close to the peat swamp [12,14,15,56]. As other clay minerals may also form, kaolinite crystallinity will be biased to being disordered [40,41].…”

Section: Original Sedimentary Environmentmentioning

confidence: 99%

“…Additionally, crystallinity has an important effect on the intercalation of kaolinite, and the disordered structure is not conducive to intercalation. Therefore, the study of kaolinite crystallinity would benefit the development of intercalated kaolinites for industrial applications [14,25].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Kaolinite Crystallinity and Influence Factors of Coal-Measure Kaolinite Rock from Datong Coalfield, China

et al. 2021

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In order to ascertain the kaolinite crystallinity of Carboniferous Permian coal-measure kaolinite rocks, seven groups of fresh samples were collected from below the ground in the Xiaoyu mine, Datong coalfield. Microscopy, X-ray diffraction (XRD), differential thermal analysis (DTA), infrared (IR) spectroscopy and X-ray fluorescence (XRF) spectrometry methods were applied to the samples. The petrographic analysis results show that the kaolinite rocks are characterized as compact, phaneritic, clastic, sand-bearing, sandy and silty types; the kaolinite content in the Shanxi formation and upper Taiyuan formations was more than 95%, while it was 60–90% in the middle and lower Taiyuan formations. Based on the Hinckley index and the features of XRD, DTA and IR of kaolinites, crystallinity was classified as having three grades: ordered, slightly disordered and disordered. The kaolinites’ SiO2 /Al2O3 molar ratio was about 1.9–5.7, with a chemical index of alteration (CIA) of about 95.4–99.5. This research suggests that the kaolinite crystallinity correlates positively to its clay mineral content, purity and particle size, which are also related to the SiO2/Al2O3 molar ratio and CIA. The original sedimentary environment and weathering have a direct influence on kaolinite crystallinity, and the existence of organic matter is conducive to the stable existence of kaolinite. The study results have significance for the extraction and utilization of coal-measure kaolinite and the development of kaolinite crystallography and mineralogy.

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Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Original Sedimentary Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Kaolinite Crystallinity and Influence Factors of Coal-Measure Kaolinite Rock from Datong Coalfield, China

et al. 2021

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“…With the development of science and technology, it is becoming a reality to use computer simulations to explain the macroscopic properties from a microscopic point of view [51][52][53][54][55][56][57][58][59]. In particular, MD simulation has proven to be a useful tool for analyzing coal interface properties at the molecular level [60][61][62][63][64][65][66]. Traditional experiments screen flotation agents and dust suppression agents by trial-and-error method.…”

Section: Introductionmentioning

confidence: 99%

Computational Study on the Microscopic Adsorption Characteristics of Linear Alkylbenzene Sulfonates with Different Chain Lengths on Anthracite Surface

Chen

Yan

et al. 2022

Journal of Chemistry

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In order to explore the influence of different lengths of hydrophobic carbon chains on the diffusion characteristics of surfactants on the surface of anthracite, six linear alkyl benzene sulfonates with different hydrophobic carbon chain lengths were selected (mC, m = 8, 10, 12, 14, 16, 18; m represents the numbers of carbon atoms in the hydrophobic carbon chain), and molecular dynamics (MD) simulations were adopted. Models of surfactant-anthracite, surfactant-graphite layer, and water-surfactant-anthracite were constructed. After analyzing a series of properties such as adsorption energy, diffusion coefficient, radial distribution function (RDF), and hydrophobic tail order parameters, it was found that 12C had the highest adsorption strength on the surface of anthracite; the reason was that 12C had the highest degree of aggregation near the oxygen-containing functional groups on the surface of anthracite. Further studies had found that the hydrophobic tail chain of 12C had the strongest isotropy. The study fills the gap in the systematic study of the diffusion characteristics of linear alkylbenzene sulfonates (LAS) with different chain lengths on the surface of anthracite, enriches and develops the basic theory of coal wettability, and also provides technical ideas for the design of new surfactants and new dust suppression agents.

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Application of molecular dynamics simulations in interface interaction of clay: Current status and perspectives

Chen

Chu

Cheng

et al. 2023

Asia-Pacific J Chem Eng

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To understand the research progress of molecular dynamics (MD) method in the field of clay minerals, the application of MD in the interface interaction of clay minerals is reviewed in this paper. MD simulations have become the indispensable means to study mineral interface effects. Clay minerals are common associated minerals with hydrophilic surface, the ease of argillization, negative electricity, and the ability of forming impurities and defects. They are widely concerned in the fields of mine wastewater treatment, fine clay mineral flotation, shale oil and gas exploitation, and so forth. In addition, clay minerals are considered as natural adsorbents due to their large specific surface area, but their complex interface interactions hinder their effective utilization. Therefore, it is particularly important to reveal the interaction mechanism of clay interface at the atomic/molecular level by means of software simulation technology. In this review, our focus is on the applications of MD method in the field of clay mineral interface interaction, such as clay/gas interface, clay/water interface, agents and clay/water interface, and mineral particle and clay/water interface. Furthermore, the history and shortcomings of MD simulation are summarized. The research and effective utilization of clay interface are summarized and prospected as well.

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Interaction between STAC and coal/kaolinite in tailing dewatering: An experimental and molecular-simulation study

Cited by 39 publications

References 57 publications

The Kaolinite Crystallinity and Influence Factors of Coal-Measure Kaolinite Rock from Datong Coalfield, China

The Kaolinite Crystallinity and Influence Factors of Coal-Measure Kaolinite Rock from Datong Coalfield, China

Computational Study on the Microscopic Adsorption Characteristics of Linear Alkylbenzene Sulfonates with Different Chain Lengths on Anthracite Surface

Application of molecular dynamics simulations in interface interaction of clay: Current status and perspectives

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