Recovering clean low-rank coal using shale oil as a flotation collector

Yangchao XiaChinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, Jiangsu, China;School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu, China

Rui ZhangChinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, Jiangsu, China;School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu, China

Zili YangChinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, Jiangsu, China;School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu, China

Yaowen XingChinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, Jiangsu, China

Xiahui GuiChinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, Jiangsu, ChinaCorrespondence[email protected]

ABSTRACT

Shale oil (SO) was adopted as flotation collector to recover clean low-rank coal. Gas chromatography-mass spectrometry, flotation, X-ray photoelectron spectroscopy and contact angle measurements were performed to identify the chemical constituents and flotation performance of SO, and the surface properties of low-rank coal. The results indicated that the long-chain hydrocarbon and high viscosity of SO may lead to the higher combustible matter recovery and lower ash content of clean coal. The adsorption of SO significantly enhanced the carbon-bearing content and decreased the C−O content, which was favorable to enhance the hydrophobicity, and thus improve the flotability of low-rank coal.

KEYWORDS:

Acknowledgments

This work was supported by the Fundamental Research Funds for Central Universities [grant number 2017XKZD04].

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