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Improving the low-rank coal flotation performance using a novel collector prepared by hot melting of plastic waste into diesel. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2
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Guo J, Xia Y, Liu Y, Liu S, Zhang L, Li B. Microscopic adsorption behaviors of ionic surfactants on lignite surface and its effect on the wettability of lignite: A simulation and experimental study. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117851] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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3
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Guo Z, Hakkou R, Yang JG, Wang Y. Effects of surface heterogeneities on wetting and contact line dynamics as observed with the captive bubble technique. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.126041] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Zhang L, Guo J, Hao M, Li B, Liu S. Microscopic spreading characteristics of non-polar oil droplet on low rank coal surface: Effects of surfactant pretreatment and oxygen-containing groups. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.115232] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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5
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Zhang R, Xing Y, Xia Y, Guo F, Ding S, Tan J, Che T, Meng F, Gui X. Synergistic Adsorption Mechanism of Anionic and Cationic Surfactant Mixtures on Low-Rank Coal Flotation. ACS OMEGA 2020; 5:20630-20637. [PMID: 32832816 PMCID: PMC7439705 DOI: 10.1021/acsomega.0c02948] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 07/27/2020] [Indexed: 05/12/2023]
Abstract
Mixed surfactants have a prominent synergistic effect and show advantages in many aspects. In this work, the effects of a mixture of dodecyltrimethylammonium bromide (DTAB) and sodium dodecyl sulfate (SDS) on the flotation of low-rank coal were studied from the wetting rate, contact angle, surface tension, and zeta potential. Furthermore, the adsorption configuration of the mixed surfactant on the surface of oxygen-containing graphite was simulated at the molecular level by molecular dynamics simulation. The experimental results show that the combustible matter recovery of low-rank coal flotation is improved using the mixed surfactant, and the contact angle test and wetting rate test confirmed the synergistic effect of the mixed surfactant. In the mixed surfactant system, the addition of SDS with an opposite charge to DTAB can reduce the mutual repulsion between DTAB molecules and enhance the degree of DTAB alignment in solution, which was analyzed by surface tension and zeta potential tests. Meanwhile, the simulation results reveal the adsorption behavior of anionic and cationic surfactants on the surface of oxygen-containing graphite from the molecular level and also verify the experimental results. This investigation provides a good understanding of the interaction mechanism of mixed surfactants in low-rank coal flotation.
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Affiliation(s)
- Rui Zhang
- Chinese
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
- School
of Chemical Engineering and Technology, China University of Mining and
Technology, Xuzhou 221116, Jiangsu, China
| | - Yaowen Xing
- Chinese
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Yangchao Xia
- Chinese
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
- School
of Chemical Engineering and Technology, China University of Mining and
Technology, Xuzhou 221116, Jiangsu, China
| | - Fangyu Guo
- Chinese
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
- School
of Chemical Engineering and Technology, China University of Mining and
Technology, Xuzhou 221116, Jiangsu, China
| | - Shihao Ding
- Chinese
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
- School
of Chemical Engineering and Technology, China University of Mining and
Technology, Xuzhou 221116, Jiangsu, China
| | - Jinlong Tan
- School
of Chemistry and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
| | - Tao Che
- Yanzhou
Coal Mining Company Limited, Zoucheng 273500, Shandong, China
| | - Fancai Meng
- Yanzhou
Coal Mining Company Limited, Zoucheng 273500, Shandong, China
| | - Xiahui Gui
- Chinese
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
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A Comparative Study on the Wettability of Two Coal Samples during Deep Burial Metamorphism. J CHEM-NY 2020. [DOI: 10.1155/2020/5608429] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In order to investigate the effect of deep burial metamorphism on the wettability of coal during deep burial metamorphism, a superficial coal sample (∼90 m) and a deep coal sample (∼490 m) collected from two main mining seams were selected to simulate the deep burial metamorphism process. The wettability of two coal samples during deep burial metamorphism was investigated by X-ray photoelectron spectroscopy (XPS), FTIR, zeta potential, and contact angle measurements. Besides, comprehensive DLVO interaction analyses between two coal samples from different mining depths were carried out through the zeta potentials measurements under different pH values. The XPS results demonstrate that the content of surface oxygen atom and oxygen-containing functional group for superficial coal tends to be higher than that of deep coal. The FTIR results indicate that the peak intensity of oxygen-containing functional groups for the superficial is higher than that of deep coal, implying the stronger surface hydrophobicity of deep coal compared to superficial coal. The contact angle of superficial coal is lower than that of deep coal. The zeta potential and DLVO theory analyses of superficial particles and deep coal particles indicate that deep burial metamorphism process might be favorable for bubble-particle collision and attachment, while might be unfavorable for the wetting process oppositely. Based on the surface chemistry characterization and theory analyses, this study is expected to give a theoretical insight into the efficient processing or dedusting process of coals experiencing different deep burial metamorphism processes in the future.
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Hu S, Li J, Yang X, Chen Y, Li F, Wang J, Wu C, Weng L, Liu K. Improvement on slurry ability and combustion dynamics of low quality coals with ultra-high ash content. Chem Eng Res Des 2020. [DOI: 10.1016/j.cherd.2020.02.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Oily collector pre-dispersion for enhanced surface adsorption during fine low-rank coal flotation. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2019.10.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Yang Z, Xia Y, Guo F, Xing Y, Gui X. Interaction characteristics between diesel and coal with different hydrophilicity: Kinetic and force effects. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.115958] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Zhang R, Guo F, Xia Y, Tan J, Xing Y, Gui X. Recovering unburned carbon from gasification fly ash using saline water. WASTE MANAGEMENT (NEW YORK, N.Y.) 2019; 98:29-36. [PMID: 31421487 DOI: 10.1016/j.wasman.2019.08.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 08/01/2019] [Accepted: 08/09/2019] [Indexed: 05/26/2023]
Abstract
Gasification fly ash is one of the wastes generated by coal gasifiers, and the unburned carbon therein seriously restricts the resource utilization of gasification fly ash. Flotation is one of the best ways to recover unburned carbon from it; however, surface pores of gasification fly ash are developed and contain several hollow hydrophilic glass beads, which makes it difficult for conventional flotation to recover unburned carbon effectively and the dosage of the flotation reagent is too high. In this study, different concentrations of saline water (NaCl, MgCl2, and AlCl3) are configured to the flotation solution, and their effect on the recovery of unburned carbon of gasification fly ash is investigated. Furthermore, the gasification fly ash treated with saline water is chosen to study the basic properties by the measurement of Zeta potential, surface tension, and flotation foam behavior. The experimental results show that with an increase in the valence state of the inorganic salt cation, the unburned carbon recovery efficiency of the gasification fly ash is significantly improved. When the concentration of Al3+ reaches 0.4 mol/L and the dosage of frother is 7.5 kg/t, the unburned carbon removal rate of the tailings reaches 95% or more. Saline water reduces the surface tension of the flotation system and weakening bubble decay; in the solution of Al3+, the flotation foam size is the smallest, followed by the solution of Mg2+, Na+. Furthermore, the saline water effectively reduces the Zeta potential of the particle surface and improves the floatability of the solid particles.
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Affiliation(s)
- Rui Zhang
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Fangyu Guo
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Yangchao Xia
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Jinlong Tan
- School of Chemistry and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
| | - Yaowen Xing
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
| | - Xiahui Gui
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, Henan, China.
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Effect of Heating Oxidation on the Surface/Interface Properties and Floatability of Anthracite Coal. Processes (Basel) 2019. [DOI: 10.3390/pr7060345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Oxidation processes of coal surfaces are both fundamental and interesting from academic and engineering points of view. In this work, we comprehensively analyzed the mechanism of heating oxidation at 200 °C on the surface/interface characters and the floatability of anthracite coal. The variations of surface/interface characters were studied using SEM (scanning electron microscopy), FTIR (Fourier transform infrared spectroscopy), and XPS (X-ray photoelectron spectroscopy). The floatability was further identified using Induction Time and Bubble-Particle Wrap Angle. It was found that, after heating oxidation at 200 °C, both surface ravines and oxygen-containing groups were increased. The degradation of hydroxyl on anthracite could be neglected during the heating, while the oxidation of hydrocarbon chains dominated the balance of hydrophobicity and hydrophilicity on coal surface. The induction time significantly increased from 200 ms to 1200 ms and 2000 ms after 10 h and 20 h of heating oxidation at 200 °C, respectively. Additionally, raw coal exhibited the fastest kinetics of bubble-particle attachment and the largest wrap angle, directly proving that the floatability decreased after oxidation.
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Comparative study on adsorption and depressant effects of carboxymethyl cellulose and sodium silicate in flotation. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.07.048] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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