Dynamic hydrothermal synthesis of xonotlite from acid-extracting residues of circulating fluidized bed fly ash

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• 作者：Jingjing Zou ; Chunbin Guo ; Cundi Wei ; Yinshan Jiang
• 关键词：Circulating fluidized bed fly ash ; Xonotlite ; Hydrothermal synthesis ; Thermal insulation material
• 刊名：Research on Chemical Intermediates
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：42
• 期：2
• 页码：519-530
• 全文大小：1,341 KB
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• 作者单位：Jingjing Zou (1)
  Chunbin Guo (1)
  Cundi Wei (1)
  Yinshan Jiang (1)
  
  1. Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University, 5988 People’s Avenue, Changchun, 130025, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Inorganic Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1568-5675

文摘

This investigation was made to examine how the conditions of hydrothermal synthesis influence the crystal structure of xonotlite and its morphology. For synthesis, we used acid residues after extracting the alumina from circulating fluidized bed fly ash as raw material, as far as we know, that no one used before. Staring with Ca/Si = 1, hydrothermal temperatures were between 180 and 260 °C. The samples were characterized in terms of mineralogical composition (XRD), morphological analysis (SEM), and thermal gravimetric and differential thermal analyses. During the 72 h synthesis at 240 °C, well formed xonotlite fibers of 10–15 μm long were obtained. Under the same conditions, but at 200 °C, the obtained xonotlite was poorly formed. The results indicated that the residue could be used to prepare pure xonotlite. Different hydrothermal temperatures and holding times have a great impact on crystallinity and morphology of xonotlite.