Based on ore characteristics and reagent properties, this paper sets out to study fluoro-carbon apatite and dolomite surface electrical properties, reagent adsorption form, surface wettability as well as the interaction mechanism between flotation reagents and minerals using applying contact angle measurement, ζ Potential and infrared spectrum analysis, in order to provide theoretical guidance for floatation practice in low grade phosphate ore of Zhijin, Guizhou. The ζ Potential metric measurement shows that ζ potential varies in accordance to the pH value no matter 2.67g/L salts of fatty acid is added or not, with a negative ζ potential value. In particular, ζ potential decreases when 2.67g/L salts of fatty acid is added at the same pH value. This may have been resulted from the selective solution of calcium ion from the apatite lattice into acid solution, or is a result of taring anion adsorbing to the mineral surface and causing negative electrification. Infra-red spectrum analysis shows that CH_3~- adsorption peak occurs at 1622.42cm~(-1) or 1623.13 cm~(-1) for tailings whereas there is no distinct CH_3~- characteristic peak. All this indicates that there is adsorption of the collector salts of fatty acid on the surface of dolomite, while almost no adsorption of the collector salts of fatty acid on that of apatite. In this way, selective separation of apatite and dolomite is achieved. An contact angle measurement shows that the contact angle θ is getting smaller no matter strong
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