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

doi:10.1016/j.cjche.2014.05.017

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

• Energy, Resources and Environmental Technology • Previous Articles

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

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

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:2015-04-03 Published:2015-03-28
Supported by:
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 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

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).

Abstract

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

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

Li Cui, Yanxia Guo, Xuming Wang, Zhiping Du, Fangqin Cheng. Dissolution kinetics of aluminum and iron from coal mining waste by hydrochloric acid[J]. , 2015, 23(3): 590-596.

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

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

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