糊精在氧化矿表面的吸附特性及作用机理

ADSORPTION BEHAVIOUR AND INTERACTION MECHANISMS OF DEXTRIN ON OXIDATIVE MINERAL SURFACE

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；金红石表面Ｔｉ元素的俄歇参数也发生明显化学位移。

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 pH range 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.