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过程工程学报 ›› 2016, Vol. 16 ›› Issue (2): 216-221.DOI: 10.12034/j.issn.1009-606X.215358

• 反应与分离 • 上一篇    下一篇

高铝粉煤灰碳酸钠焙烧与酸浸提铝的动力学

刘能生 彭金辉 张利波 蔺琎   

  1. 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学冶金与能源工程学院 昆明理工大学工程训练中心
  • 收稿日期:2015-10-20 修回日期:2015-12-01 出版日期:2016-04-20 发布日期:2016-12-22
  • 通讯作者: 彭金辉

Kinetics of Roasting of High Aluminum Content Coal Fly Ash with Sodium Carbonate and Acid Leaching for Extraction of Aluminum

LIU Neng-sheng PENG Jin-hui ZHANG Li-bo LIN Jin   

  1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology Engineering training center, Kunming University of Science and Technology
  • Received:2015-10-20 Revised:2015-12-01 Online:2016-04-20 Published:2016-12-22
  • Contact: PENG Jin-hui

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被引次数

13

摘要： 以内蒙古高铝粉煤灰(Al2O3/SiO2质量比1.24)为原料，采用Na2CO3焙烧活化-盐酸浸取法提铝，考察了焙烧温度、时间和碳酸钠/粉煤灰质量比的影响，对焙烧活化及酸浸提铝动力学进行研究，分析了提铝机理. 结果表明，高温活化条件下，粉煤灰中的莫来石及SiO2与Na2CO3反应生成NaAlSiO4, Al2O3和Na2SiO3，酸浸后铝浸出率超过94.99%；活化过程符合Crank-Ginstling-Braunshtein模型，表观活化能为117.06 kJ/mol，活化反应受固膜扩散控制.

关键词: 高铝粉煤灰, 碳酸钠, 焙烧, 碱活化, 酸浸, 动力学

Abstract: High aluminum content coal fly ash (CFA) from Inner Mongolia was roasted with Na2CO3, and the roasted material leached by HCl solution for extraction of aluminum. The effects of roasting temperature and time, and mass ratio of Na2CO3 to CFA on the leaching rate of aluminum were examined. The process kinetics and mechanisms of roasting and acid leaching were analyzed. The results showed that at high roasting temperature, the reaction of mullite (Al6Si2O13) and SiO2 in CFA with Na2CO3 resulted in formation of NaAlSiO4, Al2O3 and Na2SiO3, which could be dissolved in HCl solution. After acid leaching, the leaching rate of aluminum reached more than 94.99%. The Crank-Ginstling-Braunshtein model could be used to correlate the experimental data of roasting process, and the apparent activation energy was calculated as 117.06 kJ/mol. The reaction rate was controlled by solid-film diffusion.

Key words: high aluminum content coal fly ash, sodium carbonate, roasting, alkali activation, acid leaching, kinetics

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