The effects of BaCl2 on the flotation of K-feldspar using dodecyl amine chloride as the collector under natural pH wereinvestigated by flotation tests, absorption measurements, Fourier transform infrared spectroscopy ...The effects of BaCl2 on the flotation of K-feldspar using dodecyl amine chloride as the collector under natural pH wereinvestigated by flotation tests, absorption measurements, Fourier transform infrared spectroscopy （FTIR） and X-ray photoelectronspectroscopy （XPS）. The results indicated that lower BaCl2 concentration can increase the floatability of K-feldspar, whereas higherBaCl2 concentration can significantly inhibit the flotation of K-feldspar. Peaks at 3548.18, 3475.56 and 3414.35 cm？1in the FTIRspectra of K-feldspar adsorbed by dodecyl amine chloride revealed three forms of -OH. XPS analyses of K-feldspar adsorbed byBa2＋ showed that the concentration of K atom was reduced by nearly twice as those of Si, Al, and O. The activation of BaCl2 at a lowconcentration was mainly caused by Ba2＋ in the form of the ion exchange between K＋ and Ba2＋. The inhibitory action of BaCl2 at ahigh concentration is mainly attributed to the physical absorption of Ba2＋ on the surface of K-feldspar and the fact that a highconcentration of Cl？ causes the chemical equilibrium of dodecyl amine chloride to be changed, and the dodecyl amine chloride in theform of RNH2H＋ is reduced.展开更多
基金Project(51764021)supported by the Key Program of the National Natural Science Foundation of China
文摘The effects of BaCl2 on the flotation of K-feldspar using dodecyl amine chloride as the collector under natural pH wereinvestigated by flotation tests, absorption measurements, Fourier transform infrared spectroscopy （FTIR） and X-ray photoelectronspectroscopy （XPS）. The results indicated that lower BaCl2 concentration can increase the floatability of K-feldspar, whereas higherBaCl2 concentration can significantly inhibit the flotation of K-feldspar. Peaks at 3548.18, 3475.56 and 3414.35 cm？1in the FTIRspectra of K-feldspar adsorbed by dodecyl amine chloride revealed three forms of -OH. XPS analyses of K-feldspar adsorbed byBa2＋ showed that the concentration of K atom was reduced by nearly twice as those of Si, Al, and O. The activation of BaCl2 at a lowconcentration was mainly caused by Ba2＋ in the form of the ion exchange between K＋ and Ba2＋. The inhibitory action of BaCl2 at ahigh concentration is mainly attributed to the physical absorption of Ba2＋ on the surface of K-feldspar and the fact that a highconcentration of Cl？ causes the chemical equilibrium of dodecyl amine chloride to be changed, and the dodecyl amine chloride in theform of RNH2H＋ is reduced.
