Application of Pyridyl Ionic Liquids in the Reverse Flotation of Shengli Lignite

Zhang Xu; Yu Zhaoyi; He Yaqun; Wang Jie

doi:10.3969/j.issn.1000-6532.2022.02.021

2022 No. 2

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Article navigation > Multipurpose Utilization of Mineral Resources > 2022 > (2): 116-120

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Zhang Xu, Yu Zhaoyi, He Yaqun, Wang Jie. Application of Pyridyl Ionic Liquids in the Reverse Flotation of Shengli Lignite[J]. Multipurpose Utilization of Mineral Resources, 2022, (2): 116-120. doi: 10.3969/j.issn.1000-6532.2022.02.021

Citation:

Zhang Xu, Yu Zhaoyi, He Yaqun, Wang Jie. Application of Pyridyl Ionic Liquids in the Reverse Flotation of Shengli Lignite[J]. Multipurpose Utilization of Mineral Resources, 2022, (2): 116-120. doi: 10.3969/j.issn.1000-6532.2022.02.021

Application of Pyridyl Ionic Liquids in the Reverse Flotation of Shengli Lignite

1.
School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, China
2.
Modern Analysis & Computing Center, China University of Mining and Technology, Xuzhou, Jiangsu, China

More Information

Corresponding author: He Yaqun, yqhe_cumt@126.com

Received Date: 01 August 2020

Publish Date: 25 April 2022

Abstract

Abstract

Lignite is extremely hydrophilic; thus it is difficult to upgrade its quality by conventional flotation. In this study, cetylpyridinium chloride monohydrate (CCM) was used as the collector for quartz. The effect of CCM dosage on reverse flotation of Shengli lignite was investigated by different slurry mixing methods. And the dissolution properties of CCM and its mechanism of collecting quartz were studied via surface tensitometer and FTIR. The flotation results show that, due to the strong hydrophilicity of Shengli lignite, the performance of direct flotation is poor. With reverse flotation, the yield of clean coal and the flotation perfection are obviously improved. Besides, the reverse flotation with the zero-conditioning is more efficient than the conventional one. FTIR results show that the adsorption of CCM barely change the functional groups of quartz, indicating that CCM was adsorbed on the surface of quartz through electrostatic adsorption to collect quartz. Meanwhile, CCM adsorption significantly reduces the content of hydroxyl oxygen-containing functional groups of quartz, leading to an increase of the content of hydrophobic groups such as long-chain alkyl. As a result, the hydrophobicity of quartz was improved, and the reverse flotation of lignite was promoted.
- Lignite /
- Quartz /
- Reverse flotation /
- Ionic liquids /
- Infrared spectroscopy

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References

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