Fe3+对Al3+活化微斜长石产生屏蔽的机理
来源期刊：中国有色金属学报1999年第3期
论文作者：张琪 方和平
文章页码：606 - 609
关键词：硅线石；微斜长石；浮选分离；ζ电位
Key words：sillimanite; microcline; zeta-potential; flotation separation
摘 要：硅线石—微斜长石—油酸钠浮选分离系统中，金属离子强烈干扰浮选过程，而Fe3+可明显削弱这种干扰作用。借助显微电泳仪和X射线光电子能谱，研究了Fe3+，Al3+金属离子在硅线石和微斜长石表面的竞争吸附，揭示了Fe3+对Al3+活化微斜长石产生屏蔽作用的机理。研究发现由于Fe3+能增加硅线石表面ζ电位，同时降低微斜长石表面ζ电位，削弱了Al3+对微斜长石的活化作用；XPS研究表明Fe3+对Al3+ 活化微斜长石产生屏蔽效应的根本原因在于Fe3+ 能够降低微斜长石表面Al2p电子的结合能，从而降低其表面活性，使其不易于与捕收剂油酸钠作用。
Abstract: The great disturbance of metallic ions (Al3+ especially ), which is in the flotation system of sillimanite/microcline using sodium oleate as a collector, decrease considerably the difference of floatability of the two minerals. It has been observed that Fe3+ can obviously resist the activation of Al3+ on microcline. The mechanism of competitive adsorption of Fe3+ and Al3+ on the surface of sillimanite and microcline has been studied by the research of zeta-potential and X-ray photoelectron spectroscopy (XPS). It is observed that Fe3+ can decrease electrokinetic potential of microcline (from 8.11mV to 6.3 9mV) and the binding energy of Al2p absorbed on the surface of microcline (from 74.35eV to 73.85eV). So, the activation of Al3+ can be selectively depressed by Fe3+.
