화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.87, 136-144, July, 2020
DOI10.1016/j.jiec.2020.03.024  Export Citation
Surface structure-dependent hydrophobicity/oleophilicity of pyrite and its influence on coal flotation
Xin Qi1, 2, Xin Li1, 2, Yannan Liang1, 2, Hainan Wang1, 2, Wei Guo1, 2, Xingshun Cong3, Fakui Lv3, and Haijun Zhang1, †
  • 1National Engineering Research Center for Coal Processing and Purification, China University of Mining and Technology, Xuzhou 221116, China
  • 2School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
  • 3College of Chemistry, Chemical Engineering and Materials Science, Zaozhuang University, Zaozhuang 277160, China
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Flotation is an important method to remove the inorganic sulfur from coal. Its effect depends on the difference in adhesion between coal and pyrite to air bubbles and flotation reagents. In this study, the interface properties of coal powder/plate and pyrite powder/crystals were investigated using a comprehensive approach combining wetting process, induction time, contact angle, and X ray photoelectron spectroscopy. The experimental results show that the spreading and adsorption speed of diethyl phthalate on pyrite crystals and powder is close to that on coal surface in the air. However, the adsorption rate of pyrite to water is much higher than that of coal. In aqueous environment, it is difficult for diethyl phthalate to spread on pyrite crystals, especially in alkaline solution. The difference of hydrophobicity between coal and pyrite at air.water interface is smaller than that at oil.water interface. The adhesion of air bubble and reagent droplet on three pyrite facets is also different. The oxidation of pyrite {100} is faster and greater than that of {210} and {111} facets in alkaline solution, which is beneficial to the coal desulfurization. These findings disclose the hydrophobicity/oleophilicity and structure- reactivity dependence of pyrite in the flotation.
Keywords:Coal desulfurization;Flotation;Crystal plane;Hydrophobicity;Olephilicity
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