Welcome to visit The Chinese Journal of Process Engineering, Today is

The Chinese Journal of Process Engineering >

2016 , Vol. 16 >Issue 2: 216 - 221

DOI: https://doi.org/10.12034/j.issn.1009-606X.215358

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
Expand
  • 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 date: 2015-10-20

  Revised date: 2015-12-01

  Online published: 2016-12-22

Fold

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

Cite this article

LIU Neng-sheng PENG Jin-hui ZHANG Li-bo LIN Jin . Kinetics of Roasting of High Aluminum Content Coal Fly Ash with Sodium Carbonate and Acid Leaching for Extraction of Aluminum[J]. The Chinese Journal of Process Engineering, 2016 , 16(2) : 216 -221 . DOI: 10.12034/j.issn.1009-606X.215358

Options
Outlines

/

〈 〉

  • Administrated by Chinese Academy of Sciences
    Sponsored by Institute of Process Engineering, Chinese Academy of Sciences
    Published by China Science Publishing & Media Ltd.
    Editor-in-Chief: Yun-fa Chen
  • Addr.: Room A811, 1 North 2nd Street, Zhongguancun, Haidian District, Beijing, PR China　
    Code: 100190
    Tel：86-10-62554658　
    Fax：86-10-62554658　
    E-mail: gcgc@ipe.ac.cn