Beneficiation and influencing factors of coal-series kaolin for the reduction of COD

Huang, Teng; Lei, Shaomin; Liu, Yuanyuan; Ji, Mengjiao; Fan, Yanming

doi:10.1016/j.clay.2016.12.032

Cited by 10 publications

(4 citation statements)

References 17 publications

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“…The mineral characterization, soxhlet tests of organic matter with chloroform were described in our previous studies, while the product of extraction was characterized by gas chromatograph/mass spectroscopy (GC/MS) analyzer (7890A-5975C; Agilent, USA) as shown in Fig. 1 and Appendix [1,20].…”

Section: Materials and Characterizationmentioning

confidence: 99%

“…The chloroform extraction product of organic matter in the coal-series kaolin mainly consisted of three kinds of compounds: aliphatic hydrocarbons, aromatic hydrocarbons and oxygenated compounds, and the maximum content was n-tetracosane (C 24 H 50 , 11.95%), followed by n-tricosane (C 23 H 48 , 5.7%), ntriacontane (C 30 H 62 , approximately 5 %), and 1-octadecene (C 18 H 36 , approximately 3%). While the content of aromatic hydrocarbon and oxygenated chemicals are relatively less [1,20].…”

Section: Materials and Characterizationmentioning

confidence: 99%

“…With the rapid development of quantum chemistry theory and improvement of testing technique, research on the stability of organic composition and the interrelationship with the minerals make them possible[17~19]. Based on our previous work, we have preliminarily analyzed the composition and structural units of organic matter in the coal-series kaolin of Yichang, China [1,20]. So in this work, on account of the mineral composition in the coal-series kaolin, we will build the adsorption models between typical organic molecule and the coal-series kaolin by Density functional theory (DFT) methods, so as to reveal the occurrence state and stability differences of different organic matters on the coal-series kaolin, fully understand the interaction mechanism between organic matter and different minerals in coal series kaolin, which can be bene cial to the enrichment and recovery of organic matter, so as to further solve the bottleneck problem of restricting the whiteness and comprehensive utilization of coal-series kaolin [19,21,22].…”

Section: Introductionmentioning

confidence: 99%

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DFT Study of The Interaction Characteristics Between the Organic Matter and Minerals In Coal-Series Kaolin

Huang¹,

Lei²,

He³

et al. 2021

Preprint

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Coal-series kaolin is an associated mineral resource in coal mining process, often contains organic components and other discoloring impurities, which may lower the quality and limit the industrial application. However, the occurrence, stability of organic component and how they affect the surface physical and chemical properties of coal-series kaolin is known little. In this article, several representative organic components have been enrolled for analyzing the interactions with different minerals of the coal-series kaolin. Results shows that the unsaturated double bonds may be easier to adsorb with kaolinite, and the energy on C20H40 is the least among all the compositions. Among the different crystal planes of kaolinite, the (001) surface may possess higher adsorption characteristic on the organic molecules, which may be consistent with the crystal face index of the kaolinite. While the adsorption energy between the organic molecules and the impurities in coal-series kaolin was positive all the time, suggesting that the organic matter could only adsorb with kaolinite compared with the impurities such as pyrite, quartz and anatase. Calculations of state density also showed that the displacement of the energy band for kaolinite may shift to the lower state after adsorbed with different organic matter, also a rearrangement and significant increase of peak values for the state density may occur after adsorption. This study aims to provide a theoretical basis for the occurrence state and stability differences of different organic matters on the coal-series kaolin, also further solve the long-term problems of restricting the whiteness and comprehensive utilization of coal-series kaolin resources.

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Section: Materials and Characterizationmentioning

confidence: 99%

Section: Materials and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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DFT Study of The Interaction Characteristics Between the Organic Matter and Minerals In Coal-Series Kaolin

Huang¹,

Lei²,

He³

et al. 2021

Preprint

Self Cite

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“…Regarding the employment of the calcination method for decarburization, the optimum grain size for reducing the COD value of raw materials was in the range of −74~+60 µm when the calcination temperature was 450 • C, indicating the COD value of raw materials could be reduced from 27,517 µg/g to 585 µg/g. Huang [16] also studied the combined process of flotation and calcination, finding that the COD value of the kaolin obtained via flotation was 3533 µg/g. When the kaolin was calcined under the condition of 300 • C, the COD value of the calcined kaolin was close to 2700 µg/g, and the temperature was much lower than that of direct calcination without flotation.…”

Section: Introductionmentioning

confidence: 99%

Research on the Preparation of Kaolin from Coal Gangue by Flotation Decarburization with Different Collectors

Ren,

Shu,

et al. 2023

Processes

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In order to find a better collector for the separation of carbon and kaolin from coal gangue flotation, and to explore the action mechanism of collectors, this paper selected 12 kinds of collectors for systematic comparison, including five non-polar organics with different carbon chain lengths, and polar organic matters with double bonds, triple bonds, benzene, as well as cycloalkyl, ester, carboxyl, and aldehyde groups. The flotation results show that the longer carbon chain (with a carbon atom number of 13~15), the better the flotation effect, the better the effect of the collector with the phenyl group (among the four hydrocarbon groups), and the better the effect of the collector with the ester group (among the three functional groups). In order to explore the flotation mechanism at the microscopic level, the molecular structure of carbon in coal gangue was detected using a solid nuclear magnetic test. Afterwards, the organic macromolecule model of carbon was simulated. Finally, the interaction energy values between carbon and collectors were calculated in accordance with the density functional theory, and the order of the acting force of collectors was obtained, which was consistent with that of the collectors in the macro experiment.

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Composition, purification, and identification of carbon matter in coal-series kaolin by COD analysis

et al. 2018

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Beneficiation and influencing factors of coal-series kaolin for the reduction of COD

Cited by 10 publications

References 17 publications

DFT Study of The Interaction Characteristics Between the Organic Matter and Minerals In Coal-Series Kaolin

DFT Study of The Interaction Characteristics Between the Organic Matter and Minerals In Coal-Series Kaolin

Research on the Preparation of Kaolin from Coal Gangue by Flotation Decarburization with Different Collectors

Composition, purification, and identification of carbon matter in coal-series kaolin by COD analysis

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