自然pH条件下BaCl2对钾长石盐酸十二胺浮选的影响

摘要

采用浮选试验、吸附量测定、傅里叶转换红外光谱分析(FTIR)以及X射线光电子能谱分析(XPS)研究自然pH条件下BaCl2对钾长石盐酸十二胺浮选的影响.研究结果表明,低浓度BaCl2对钾长石的浮选具有活化作用,高浓度BaCl2对钾长石浮选具有抑制作用.位于3548.18、3475.56和3414.35 cm-1的红外光谱谱峰表明盐酸十二胺与钾长石表面作用后有3种不同—OH基团存在.XPS分析结果表明,Ba2+在钾长石表面吸附后,长石表面K原子的浓度降低程度是Si、Al和O原子的两倍.低浓度下BaCl2的活化作用可归因于矿物表面K+和Ba2+的离子交换作用;高浓度下BaCl2的抑制作用可归因于矿物表面Ba2+的物理吸附;同时矿浆中Cl-浓度的增加也会导致盐酸十二胺溶解平衡的移动,RNH2H+的浓度降低.%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.