Effect of particle size and alkali activation on coal fly ash and their role in sintered ceramic tiles

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• 作者：Yang Luo^a ; ^b ; Shuhua Ma^a ; ^{shma@ipe.ac.cn} ; Chunli Liu^a ; ^b ; Zhenqing Zhao^a ; ^c ; Shili Zheng^a ; Xiaohui Wang^a
• 关键词：Coal fly ash ; Particle size ; Alkali activation ; Role ; Ceramic tile
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：37
• 期：4
• 页码：1847-1856
• 全文大小：3352 K
• 卷排序：37

文摘

We focus on fly ashes of different sizes and their alkali-activation on ceramic products. Backscattered electron imaging-energy dispersive X-ray spectroscopy was used to classify coal fly ash particles according to particle size and to study the pre-activation of particles with different sizes. Secondary electron imaging-energy dispersive X-ray spectroscopy was used to study the role of coal fly ash particles of different sizes in ceramic bodies before and after alkali-activation. Ash particles can be divided into three classes based on size: clay-, quartz- and feldspar-like particles, which act as clay, quartz and feldspar, respectively, in ceramic bodies. The pre-activation process contributes to the plasticity of ash particles, the crystal skeleton role of clay-like particles and the fluxing agent role of feldspar-like particles, so preprocessing can improve the performance of ash-based ceramic tiles significantly. This research provides a new pretreatment method for coal fly ash in ceramic fields.