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This is an article in the field of mineral processing engineering. Three samples of 5#, 9# and Mugua coal from Coal Preparation Plant of Lyulin Energy & Chemical Co., Ltd. were collected as the research objects. Screening, proximate analysis and ultimate analysis of the three coal samples were carried out. The mineral composition and surface functional groups of the three coal samples were analyzed by XRD, FT-IR and XPS. Kerosene, on-site reagent and TY6 developed in the laboratory were used for flotation tests. The collecting effect of the three reagents on different types of coal samples was compared. The results showed that 5# coal sample was easy to float, 9# coal sample showed less floatability than 5# coal, while Mugua coal showed the poorest floatability owing to high oxidation and strong hydrophilicity. For the three coal samples, TY6 and the on-site reagents both showed much better collective ability than kerosene and consume less as well. For easy-to-float coal, TY6 showed better selectivity, while for difficult-to-float coal, TY6 showed better collectivity. Smaller particle size dispersed in water, higher viscosity, and containing oxygen-bearing organic substances were the main characteristics of TY6 and the on-site reagents that made them stand out as compared with kerosene, which resulted in better reaction with coal surface, bigger contact angle and better hydrophobicity. In this point of view, TY6 behaved even a little better than the on-site reagents.

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