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Experimental study on coal dust wettability strengthened by surface active ionic liquids
Weiqing Zhang1,2, Qiang Hu3,4, Shuguang Jiang5,6
1State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China. wq.zhang@cumt.edu.cn.
Environmental Science and Pollution Research International
|February 15, 2022
Summary
Ionic liquids enhance coal dust wettability, crucial for water-based dust control. Surface active ionic liquids improve coal wettability, especially for bituminous coal and anthracite, by altering surface chemistry.
Area of Science:
- Materials Science
- Environmental Science
- Chemical Engineering
Background:
- Coal dust wettability is critical for effective dust control using water-based suppressants.
- Surface active ionic liquids offer potential for improving coal dust's interaction with water.
Purpose of the Study:
- To investigate the surface activity of various ionic liquids.
- To evaluate the impact of ionic liquids on coal dust wettability.
- To explore the dual strengthening effects of ionic liquids on coal wettability.
Main Methods:
- Surface tension tests were conducted on ten ionic liquids with varying anions and cations.
- Coal dust wettability was assessed after individual ionic liquid addition to water and pre-treatment.
- Dual strengthening effects were studied by combining ionic liquid solutions and treated coal samples.
Main Results:
- Ionic liquids significantly improved the wettability of bituminous coal and anthracite, with less effect on lignite.
- Dual application of ionic liquids showed synergistic effects, particularly [C12MIm]Br for bituminous coal and anthracite.
- Surface analysis revealed increased hydrophilic groups, decreased hydrophobic groups, and adsorbed ionic liquids on coal.
Conclusions:
- Surface active ionic liquids effectively enhance coal dust wettability, particularly for higher-rank coals.
- The observed enhancement is attributed to changes in surface functional groups and ionic liquid adsorption.
- Optimized ionic liquid combinations offer a promising approach for advanced dust control in mining operations.
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