Effect of Calcination on Pore Structure and Fractal Characteristics of Diatomite

被引：0
|
作者：
Hu Z. [1 ,2 ,3 ]
Zheng S. [4 ]
Li Y. [1 ]
Wen X. [1 ]
Huang J. [1 ]
Huang T. [1 ,2 ,3 ]
机构：
[1] School of Environment and Resource, Southwest University of Science and Technology, Mianyang
[2] Key Laboratory of Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Ministry of Education, Mianyang
[3] Sichuan Provincial Engineering Lab of Non-Metallic Mineral Powder Modification and High-Value Utilization, Southwest University of Science and Technology, Mianyang
[4] School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2021年 / 49卷 / 07期
关键词：
Diatomite; Fractal; Pore structure;
D O I：
10.14062/j.issn.0454-5648.20200986
中图分类号：
学科分类号：
摘要：
Diatomite samples were prepared at different calcination temperatures, with Linjiang diatomite as raw material. Pore structures of the diatomite and calcined samples were characterized by using the low-temperature nitrogen adsorption and the mercury intrusion technologies. With these experimental data, fractal characteristics of the diatomite and the calcined samples were analyzed with FHH model, Menger sponge model and thermodynamic relations model. It was found that the diatomite contained mainly mesoporous and macropores. With increasing calcination temperature, specific surface area and mesoporous volume of the diatomite samples were decreased, while the proportion of the macropores was increased. At the same time, the sample surface roughness was reduced or the surface became smoother and smoother. When the calcination temperature was lower than 600 ℃, fractal dimension of the mesopore volume and heterogeneity of the mesoporous structure were decreased with increasing calcination temperature. The deformation of the mesoporous structure and the mesoporous volume fractal dimension was seriously accelerated after calcining at 1000 ℃. When the calcination temperature was higher than 600 ℃, the fractal dimension of the macroporous pores was reduced, while the roughness and inhomogeneity of macropore surface of the samples were decreased. © 2021, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.
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页码：1395 / 1402
页数：7
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