中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 28 No. 11 November 2018 |
（1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Henan Key Laboratory of Aeronautical Materials and Application Technology, School of Mechatronics Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China）
Abstract:The effects of BaCl2 on the flotation of K-feldspar using dodecyl amine chloride as the collector under natural pH were investigated by flotation tests, absorption measurements, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results indicated that lower BaCl2 concentration can increase the floatability of K-feldspar, whereas higher BaCl2 concentration can significantly inhibit the flotation of K-feldspar. Peaks at 3548.18, 3475.56 and 3414.35 cm-1 in the FTIR spectra of K-feldspar adsorbed by dodecyl amine chloride revealed three forms of —OH. XPS analyses of K-feldspar adsorbed by Ba2+ 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 low concentration was mainly caused by Ba2+ in the form of the ion exchange between K+ and Ba2+. The inhibitory action of BaCl2 at a high concentration is mainly attributed to the physical absorption of Ba2+ on the surface of K-feldspar and the fact that a high concentration of Cl- causes the chemical equilibrium of dodecyl amine chloride to be changed, and the dodecyl amine chloride in the form of RNH2H+ is reduced.
Key words: K-feldspar; BaCl2; dodecyl amine chloride; activation; flotation
