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Xin Qi,Xin Li,Yannan Liang,Hainan Wang,Wei Guo,Xingshun Cong,Fakui Lv,Haijun Zhang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
Flotation is an important method to remove the inorganic sulfur from coal. Its effect depends on thedifference in adhesion between coal and pyrite to air bubbles andflotation reagents. In this study, theinterface properties of coal powder/plate and pyrite powder/crystals were investigated using acomprehensive approach combining wetting process, induction time, contact angle, and X-rayphotoelectron spectroscopy. The experimental results show that the spreading and adsorption speedof diethyl phthalate on pyrite crystals and powder is close to that on coal surface in the air. However, theadsorption rate of pyrite to water is much higher than that of coal. In aqueous environment, it is difficultfor diethyl phthalate to spread on pyrite crystals, especially in alkaline solution. The difference ofhydrophobicity 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 ofpyrite {100} is faster and greater than that of {210} and {111} facets in alkaline solution, which is beneficialto the coal desulfurization. Thesefindings disclose the hydrophobicity/oleophilicity and structure-reactivity dependence of pyrite in theflotation.
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