糊精在重晶石和萤石表面吸附特性及作用机理的研究

A STUDY ON THE ADSORPTION PROPERTIES OF DEXTRIN ON BARITE AND FLUORITE SURFACE AND INTERACTION MECHANISM

本工作系统地研究了聚合碳水化合物——糊精在重晶石和萤石表面的吸附特性。发现糊精在矿物表面的吸附强烈地依赖于矿浆ｐＨ值。糊精在矿物表面吸附密度最大值为：对于萤石在ｐＨ值大于１２．０，而对于重晶石在ｐＨ为９．７和强酸性范围内。通过Ｘ射线光电子能谱（ＸＰＳ）和Ａｕｇｅｒ电子能谱（ＡＥＳ）测定发现：经糊精处理前后，重晶石表面Ｂａ元素Ａｕｇｅｒ参数变化显著（－０．７５ｅＶ），这表明糊精与重晶石表面的作用为化学作用；而糊精与萤石作用前后Ｃａ元素的Ａｕｇｅｒ参数变化为－０．２０ｅＶ，化学作用很弱，更可能是物理作用，如氢键作用。

A systematic study on the adsorption properties of polymeric carbohydrate dextrin on barite and fluorite surface was carried out.It is observed that adsorption of dextrin on barite and fluorite surface is strongly dependent on pH value.Maxium adsorption of dextrin is around pH value>12 0 for fluorite,and pH value=9 7 and in the acidity range for barite;measurements of Xray photoelectron spectroscopy (XPS) and Auger photoelectron spectroscopy (AES) reveal that before and after in teraction with dextrin,Auger parameter of Ba element on barite surface shows significant chemical shift(-0 75eV).This indicates that dextrin interacts chemically with barite,whereas the chemical shift of Ca element on fluorite surface is small (-0 20eV) after interaction with dextrin,showing a very weak chemical interaction,moreover it is probably a physical interaction,such as hydrogen bonded action.