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An M, Liao Y, Yang Z, Cao Y, Hao X, Song X, Ren H, Yang A, Chen L. Energy Feature of Air Bubble Detachment from a Low-Rank Coal Surface in the Presence of a Dodecane-Oleic Acid Collector Mixture. ACS OMEGA 2022; 7:18315-18322. [PMID: 35694471 PMCID: PMC9178753 DOI: 10.1021/acsomega.2c00453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 05/17/2022] [Indexed: 06/15/2023]
Abstract
It has been generally proved that mixed collectors can enhance the flotation of low-rank coal (LRC). However, the inhibition effect of mixed collectors on the detachment between particles and bubbles is still unclear. In this paper, the energy feature of air bubble detachment from the LRC surface in the presence of dodecane (D), oleic acid (OA), and the mixture of dodecane and oleic acid (OA-D) was studied. The effect of collectors on the LRC surface property was analyzed using contact angle measurement, X-ray photoelectron spectroscopy, and wetting heat measurement. The force and displacement during the detachment process were measured synchronously using microforce balance. The results showed that the collector treatment increased the C-C/C-H content and decreased the content of oxygen-containing groups on the LRC surface. The synergistic effect between OA and D enabled the mixed collector to exhibit higher contact angle and wetting heat. Bubble detachment from the LRC surface can be divided into two stages: bubble stretching and bubble sliding, which corresponded to activation energy and detachment work, respectively. The activation energy and detachment work decreased in the same order of OA-D > OA > D, indicating that the mixed collector OA-D increased the energy of bubble detachment from the LRC surface and enhanced the adhesion strength. The theoretical detachment work was calculated, and the calculated results were in agreement with the measured results. This research provides a new perspective on the mechanism of LRC flotation being improved by mixed collectors.
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Affiliation(s)
- Maoyan An
- School
of Transportation Engineering, Jiangsu Vocational
Institute of Architectural Technology, Xuzhou 221116, Jiangsu, P.R. China
- Jiangsu
Engineering Lab of Biomass Resources Comprehensive Utilization, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, Jiangsu, P.R. China
| | - Yinfei Liao
- National
Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China
| | - Zhe Yang
- School
of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China
| | - Yijun Cao
- National
Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China
| | - Xiaodong Hao
- School
of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China
| | - Xingwei Song
- School
of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China
| | - Hourui Ren
- School
of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China
| | - Aosheng Yang
- School
of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China
| | - Luojian Chen
- School
of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, P.R. China
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Lin Q, Mei Y, Huang W, Zhang B, Liu K. Understanding the Role of Polyvinylpyrrolidone on Ultrafine Low-Rank Coal Flotation. ACS OMEGA 2022; 7:10196-10204. [PMID: 35382342 PMCID: PMC8973116 DOI: 10.1021/acsomega.1c06701] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 03/07/2022] [Indexed: 05/24/2023]
Abstract
Effective regulation reagents are essential in low-rank coal flotation for improving the floatability of ultrafine particles. Polymer regulators have great potential in the surface modification of ultrafine coal particles. A novel nonionic polymer, polyvinylpyrrolidone (PVP), is evaluated in this study to determine its effectiveness as a regulator in floating ultrafine low-rank coal. Laser particle size analysis is used to discern both the size distribution of coal particles and the change in size distribution. Contact angle tests are carried out to evaluate the wettability of low-rank coal. Surface functional groups of low-rank coal are analyzed by Fourier transform infrared spectroscopy, and the surface interaction energy is tested by X-ray photoelectron spectroscopy. The results show effective adsorption of PVP and demonstrate the effects of PVP at the coal surface. The adsorption of PVP changes the proportion of exposed carbon and oxygen-containing functional groups on the surface of low-rank coal, regulating the size distribution of low-rank coal particles in suspension. The success of polyvinylpyrrolidone as a regulator in low-rank coal flotation is demonstrated, and the mechanisms by which PVP can affect ultrafine low-rank coal flotation are elucidated.
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Affiliation(s)
- Qiuyu Lin
- School
of Chemistry and Chemical Engineering, Harbin
Institute of Technology, Harbin 150001, China
- Department
of Chemistry, Southern University of Science
and Technology, Shenzhen 518055, China
| | - Yujie Mei
- School
of Chemistry and Chemical Engineering, Harbin
Institute of Technology, Harbin 150001, China
- Department
of Chemistry, Southern University of Science
and Technology, Shenzhen 518055, China
| | - Wei Huang
- Shenzhen
Engineering Research Center for Coal Comprehensive Utilization, School
of Innovation and Entrepreneurship, Southern
University of Science and Technology, Shenzhen 518055, China
- Academy
for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China
| | - Bo Zhang
- Key
Laboratory of Coal Processing and Efficient Utilization of Ministry
of Education, China University of Mining
& Technology, Xuzhou, Jiangsu 221116, China
| | - Ke Liu
- Department
of Chemistry, Southern University of Science
and Technology, Shenzhen 518055, China
- Shenzhen
Engineering Research Center for Coal Comprehensive Utilization, School
of Innovation and Entrepreneurship, Southern
University of Science and Technology, Shenzhen 518055, China
- Academy
for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China
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Liu Z, Ren H, Yang Z, Liao Y, Cao Y. Effect of mixed collector addition sequence on the adsorption behavior of low-rank coal surface: Experimental and molecular dynamics simulation study. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117119] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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