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Article

Improving Low Rank Coal Flotation Using a Mixture of Oleic Acid and Dodecane as Collector: A New Perspective on Synergetic Effect

1
Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, China
2
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China
3
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
*
Author to whom correspondence should be addressed.
Academic Editor: Adam Smoliński
Processes 2021, 9(3), 404; https://doi.org/10.3390/pr9030404
Received: 28 January 2021 / Revised: 19 February 2021 / Accepted: 19 February 2021 / Published: 24 February 2021
The mixed collector can improve low rank coal flotation efficiency, but its synergistic mechanism needs to be further explored. In this paper, oleic acid-dodecane (OA-D), oleic acid (OA), and dodecane (D) were employed to treat the low rank coal for revealing new synergistic mechanism of the mixed collector. First the surface free energy of the coal, the surface free energy of coal-water and coal-water-coal were calculated. Then wetting heat measurement, X-ray Photoelectron Spectroscopy (XPS) and FTIR were used to analyze synergistic mechanism of the mixed collector in depth. The results showed that OA-D obtained a higher combustible recovery than using OA and D, respectively. The essence of synergetic mechanism of OA-D was that they formed a relatively ordered “supramolecular structure” on the low rank coal surface, especially there were hydrophobic and van der Waals forces between the oleic acid chain and the dodecane chain that can promote the formation of a continuous collector film. View Full-Text
Keywords: low rank coal; mixed collector; synergetic mechanism; supramolecular structure low rank coal; mixed collector; synergetic mechanism; supramolecular structure
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MDPI and ACS Style

An, M.; Liao, Y.; Cao, Y.; Hao, X.; Ma, L. Improving Low Rank Coal Flotation Using a Mixture of Oleic Acid and Dodecane as Collector: A New Perspective on Synergetic Effect. Processes 2021, 9, 404. https://doi.org/10.3390/pr9030404

AMA Style

An M, Liao Y, Cao Y, Hao X, Ma L. Improving Low Rank Coal Flotation Using a Mixture of Oleic Acid and Dodecane as Collector: A New Perspective on Synergetic Effect. Processes. 2021; 9(3):404. https://doi.org/10.3390/pr9030404

Chicago/Turabian Style

An, Maoyan, Yinfei Liao, Yijun Cao, Xiaodong Hao, and Longfei Ma. 2021. "Improving Low Rank Coal Flotation Using a Mixture of Oleic Acid and Dodecane as Collector: A New Perspective on Synergetic Effect" Processes 9, no. 3: 404. https://doi.org/10.3390/pr9030404

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