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Sintering inhibition and oil-absorption properties of calcined coal-series kaolin

Published online by Cambridge University Press:  18 April 2023

Jiaquan Li
Affiliation:
College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
Zhiwei Huang
Affiliation:
College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
Qian Wang
Affiliation:
College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
Fengnian Zhang
Affiliation:
College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
Yang Miao*
Affiliation:
College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
Feng Gao
Affiliation:
College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, P.R. China
*
Corresponding author: Yang Miao; Email: miaoyang198781@163.com

Abstract

In this study, aluminium fluoride trihydrate (AlF3⋅3H2O) was used to inhibit the sintering of calcined coal-series kaolin (CCSK). In addition, the oil absorption properties of CCSK were studied. The particle-size distribution, specific surface area and porosity of the samples were investigated as a function of calcination temperature and the addition of AlF3⋅3H2O. Moreover, the ability of AlF3⋅3H2O to improve the oil absorption of CCSK was explored. The morphology, structure and phase composition of the specimens were investigated using scanning electron microscopy and X-ray diffraction. The phase transition during heating of the samples was studied using thermogravimetric analysis. The preparation with 10 wt.% AlF3⋅3H2O had the optimal sintering inhibition effect on CCSK at 1000°C. The release of SiF4 gas during heating and the formation of mullite whiskers on the particle surface caused by AlF3⋅3H2O moderated the formation of molten-phase liquid bridges between particles and inhibited sintering of the raw material powder. Furthermore, the formation of submicron mullite whiskers on the surface of the CCSK particles enhanced the oil-absorption properties of the sample significantly.

Type
Article
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Contributed equally to this work and should be considered co-first authors

editor: George Christidis

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