(1. 武漢科技大學(xué)資源系，武漢 430080； 2. 武漢工業(yè)大學(xué)資源與環(huán)境工程系，武漢 430070)
摘 要: 硅線石—微斜長石—油酸鈉浮選分離系統(tǒng)中，金屬離子強烈干擾浮選過程，而Fe3+可明顯削弱這種干擾作用。借助顯微電泳儀和X射線光電子能譜，研究了Fe3+，Al3+金屬離子在硅線石和微斜長石表面的競爭吸附，揭示了Fe3+對Al3+活化微斜長石產(chǎn)生屏蔽作用的機理。研究發(fā)現(xiàn)由于Fe3+能增加硅線石表面ζ電位，同時降低微斜長石表面ζ電位，削弱了Al3+對微斜長石的活化作用；XPS研究表明Fe3+對Al3+ 活化微斜長石產(chǎn)生屏蔽效應(yīng)的根本原因在于Fe3+ 能夠降低微斜長石表面Al2p電子的結(jié)合能，從而降低其表面活性，使其不易于與捕收劑油酸鈉作用。
關(guān)鍵字: 硅線石；微斜長石；浮選分離；ζ電位
（1. Department of Resources Engineering, Wuhan University of Science and Technology, Wuhan 430080, P.R.China
2. Department of Mineral Resources and Environmental Engineering,
Wuhan University of Technology, Wuhan 430070, P.R.China）
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+.
Key words: sillimanite; microcline; zeta-potential; flotation separation
