CUI Jiarui， ZHANG Zepeng, YAN Haowei

(School of Materials Science and Technology, China University of Geosciences(Beijing)， Beijing 100083， China)

Abstract: The Na-montmorillonite from Kazuo and the attapulgite from Xuyi were adopted as ingredients, the effects of acidity(pH value) on the structure and properties of montmorillonite、attapulgite and composite clay suspensions were investigated. The gel properties were tested and characterized by X-ray diffraction, transmission electron microscopy, microelectron microscopy and Zeta potential analysis. The results show that with the increase of pH, the platelets detachment and dispersion degree of montmorillonite, the crystal beam dissociation and dispersion degree of attapulgite, the absolute value Zeta potential all increase. For the attapulgite sample, the viscosity increase first and decrease afterwords, when the acidity is 11.3, the viscosity reaches to the maximum as 516 mPa·s. The viscosity of montmorillonite sample and the composite clay sample increase dramatically with the increase of acidity. At pH=12.3, the viscosity of monomodacite sample reaches more than 10 000 mPa·s. The viscosity of composite clay sample is up to 8 920 mPa·s at pH=13, and the viscosity value of composite clay sample is smaller than that of montmorillonite, that is, the gel performance is poor.

Keywords: acidity; montmorillonite; attapulgite; composite clay; gel property

中图分类号：TQ630.4

文献标志码：A

收稿日期： 2018-11-24，修回日期:2019-01-18，在线出版时间：2019-01-24 11:41。

基金项目：国家重点研发计划重点专项，编号：2017YFB0310901。

第一作者简介：崔家瑞(1995—)，男，硕士研究生，研究方向为黏土矿物凝胶。E-mail：891356723@qq.com。

通信作者简介：张泽朋(1960—)，女，博士，教授，硕(博)士生导师，研究方向为矿物材料改性及应用、复合材料制备及应用。E-mail：zhangzp@cugb.edu.cn。

文章编号：1008-5548(2019)03-0055-10

DOI:10.13732/j.issn.1008-5548.2019.03.010