(武汉工业大学资源与环境工程系，武汉430070)
摘 要: 通过系统地研究糊精在赤铁矿、金红石等氧化矿表面的吸附规律发现：糊精在矿物表面的吸附与矿浆pH值有关，糊精在矿物表面的吸附密度最大值时pH值对应于矿物表面等电点，这表明糊精主要是与矿物表面金属羟基化合物发生作用，通过X射线光电子能谱(XPS)和俄歇电子能谱(AES)测定发现:经糊精处理前后，赤铁矿表面Fe元素内层电子结合能有明显化学变化；金红石表而Ti元素的俄歇参数也发生明显化学位移，这表明糊精与赤铁矿和金红石表面的金属羟基化合物发生了化学络合反应。
关键字: 糊精 赤铁矿 金红石 化学络合作用
（Resource and Environment Engineering Department,
Wuhan University of Technology, Wuhan 430070）
Abstract:A systematic study has been carried out to investigate the adsorption behaviour of dextrin on oxidative minerals ( such as hematite, rutile). It was observed that dextrin adsorptions on hematite and rutile are strongly pH-dependent, with the pHrange in which dextrin has maximum adsorption around the isoelectron point of the minerals, which indicates that dextrin adsorption is accomplished through interactions with surface metal hydroxy complexes. By X-Ray
photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES), it was discovered that, before and after the interaction between oxide minerals and dextrin, both core electronic energies of Fe element in hematite and Auger parameters of Ti element in rutile varied obviously, showing that significant chemical interaction occurred between metal hydroxy complexes of hematite and rutile.
Key words: dextrin hematite rutile chemical complex interaction
