Optimization of Experimental Conditions for Alkaline Alumina Extraction from Coal Gangue

doi:10.11930/j.issn.10.11930.2015.1.64

journal1 ›› 2015, Vol. 48 ›› Issue (1): 64-67.DOI: 10.11930/j.issn.10.11930.2015.1.64

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Optimization of Experimental Conditions for Alkaline Alumina Extraction from Coal Gangue

XIANG Yajun¹, JI Lichun², REN Genkuan³

1. College of Energy and Power Engineering of Inner Mongolia University of Technology, Hohhot 010062, China;
2. College of Chemical Engineering of Inner Mongolia University of Technology, Hohhot 010062, China;
3. College of Chemistry and Chemical Engineering, Yibin University, Yibin 644007, China

Received:2014-10-27 Online:2015-11-24 Published:2015-11-25

Abstract

Abstract: There exists valuable alumina in the industrial solid waste coal gangue which can become treasure when it substitutesfor bauxite for alumina extraction. However, the kaolin form of aluminum-silicon in the coal gangue has low activity, which has to be broken in high temperatures to change the alumina into soluble calcium aluminate in sodium carbonate solution. In order to achieve the maximal leaching rate of alumina in the coal gangue with lime sinter process, the experimental conditions for activation and extraction of coal gangue are optimized with orthogonal experiments respectively. The experimental results show that in the process of alumina extraction in coal gangue by the lime sinter process, the optimal alumina leaching efficiency can be as much as 89.5%. Therefore, the optimized experimental condition may provide a reference for industrial tests.

Key words: coal gangue, alumina, lime sinter process, leaching efficiency, calcium aluminate, waste recovery

CLC Number:

TF80

XIANG Yajun, JI Lichun, REN Genkuan. Optimization of Experimental Conditions for Alkaline Alumina Extraction from Coal Gangue[J]. journal1, 2015, 48(1): 64-67.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.1.64

https://www.electricpower.com.cn/EN/Y2015/V48/I1/64

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Optimization of Experimental Conditions for Alkaline Alumina Extraction from Coal Gangue

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