LI Kun, CHENG Hongfei

(School of Geoscience and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

Abstract: A kind of 4A molecular sieve was synthesized from kaolinite obtained from different regions by hydrothermal crystallization. The structure and thermal stability of the 4A molecular sieve were analyzed by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermal analysis (TG-DSC).The results showed that the order of crystallinity of kaolinite from different regions from high to low was as follows Zhangjiakou, Tashan, Haerwusu, Buliangou. The activation of kaolinite with good crystallinity requires higher temperature. When the optimum calcination temperature is 800 ℃, crystallization temperature is 95 ℃ and crystallization time is 6h, the 4A molecular sieve zeolite has good skeleton and thermal stability.

Keywords: kaolinite; crystallinity; 4A molecular sieve; hydrothermal crystallization

文章编号：1008-5548(2020)03-0075-06

DOI:10.13732/j.issn.1008-5548.2020.03.012

中图分类号：P62                                文献标志码：A

收稿日期： 2019-10-21，修回日期：2020-03-01，在线出版时间：2020-04-03 15:27。

基金项目：国家自然科学基金项目，编号：41602171；山西省科技重大专项资助项目，编号：20181101003。

第一作者简介：李 昆(1994—)，女，硕士研究生，研究方向为矿产资源综合利用。E-mail：2903897191@qq.com。

通信作者简介：程宏飞(1983—)，男，教授，博士生导师，研究方向为矿产资源综合利用。E-mail：H.cheng@cumtb.edu.cn。