SCI和EI收录∣中国化工学会会刊

›› 2015, Vol. 23 ›› Issue (3): 590-596.DOI: 10.1016/j.cjche.2014.05.017

• 能源、资源与环境技术 • 上一篇    

Dissolution kinetics of aluminum and iron from coal mining waste by hydrochloric acid

Li Cui1, Yanxia Guo1, Xuming Wang2, Zhiping Du1, Fangqin Cheng1   

  1. 1 Institute of Resources and Environment Engineering, Shanxi University, State Environmental Protection Key Laboratory of Efficient Utilization Technology of CoalWaste Resources, Taiyuan 030006, China;
    2 Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, Salt Lake City 84112, UT, USA
  • 收稿日期:2013-12-09 修回日期:2014-05-26 出版日期:2015-03-28 发布日期:2015-04-03
  • 通讯作者: Fangqin Cheng
  • 基金资助:
    Supported by the National High Technology Research and Development Program of China (2011AA06A103) and the National Natural Science Foundation of China (21306109).

Dissolution kinetics of aluminum and iron from coal mining waste by hydrochloric acid

Li Cui1, Yanxia Guo1, Xuming Wang2, Zhiping Du1, Fangqin Cheng1   

  1. 1 Institute of Resources and Environment Engineering, Shanxi University, State Environmental Protection Key Laboratory of Efficient Utilization Technology of CoalWaste Resources, Taiyuan 030006, China;
    2 Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, Salt Lake City 84112, UT, USA
  • Received:2013-12-09 Revised:2014-05-26 Online:2015-03-28 Published:2015-04-03
  • Supported by:
    Supported by the National High Technology Research and Development Program of China (2011AA06A103) and the National Natural Science Foundation of China (21306109).

摘要: The extraction of aluminum from coal mining waste (CMW) is an important industrial process. The two major problems in applications are low aluminum dissolution efficiency and high iron content in the raw material, which affect the quantity and quality of products. To improve the aluminumrecovery process, the leaching kinetics of CMWwith hydrochloric acid was studied. A shrinking core model was used to investigate aluminum and iron dissolution kinetics. Based on the kinetic characteristics, a process for recovering aluminum was proposed and tested experimentally. It is found that the aluminum leaching reaction is controlled by surface reaction at low temperatures (40-80℃) and by diffusion process at higher temperatures (90-106℃). The iron dissolution process is dominated by surface reaction at 40-100℃. The results showthat iron could be dissolved or separated by concentrated hydrochloric acid. Fine grinding will improve aluminum dissolution significantly.

关键词: Coal mining waste, Leaching kinetics, Aluminum, Iron, Fine grinding

Abstract: The extraction of aluminum from coal mining waste (CMW) is an important industrial process. The two major problems in applications are low aluminum dissolution efficiency and high iron content in the raw material, which affect the quantity and quality of products. To improve the aluminumrecovery process, the leaching kinetics of CMWwith hydrochloric acid was studied. A shrinking core model was used to investigate aluminum and iron dissolution kinetics. Based on the kinetic characteristics, a process for recovering aluminum was proposed and tested experimentally. It is found that the aluminum leaching reaction is controlled by surface reaction at low temperatures (40-80℃) and by diffusion process at higher temperatures (90-106℃). The iron dissolution process is dominated by surface reaction at 40-100℃. The results showthat iron could be dissolved or separated by concentrated hydrochloric acid. Fine grinding will improve aluminum dissolution significantly.

Key words: Coal mining waste, Leaching kinetics, Aluminum, Iron, Fine grinding