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Licensed Unlicensed Requires Authentication Published by De Gruyter February 14, 2020

Aluminum extraction technologies from high aluminum fly ash

  • Yajing Gao , Kai Liang , Yi Gou , Shun’an Wei , Weifeng Shen EMAIL logo and Fangqin Cheng EMAIL logo

Abstract

Coal fly ash (CFA), an industrial by-product of high-temperature combustion of coal in coal-fired power plants, is one of the most complex and largest amounts of industrial solid wastes generated in China. It is widely recognized that CFA should be considered as a potential alumina resource to substitute bauxite. In this review, the features of high-alumina fly ash and aluminum recovery technologies are first described. Later, the merits and drawbacks of alumina extraction technologies in recovering more valuable materials are compared in terms of extraction mechanisms and equipment requirements. It is shown that “predesilicating-sodium carbonate (Na2CO3) activation-acid leaching” is currently a promising method in achieving multimetal synergistic extraction. Finally, the hydrochloric acid and sulfuric acid combination process is proposed as a sustainable development of the predesilicating-Na2CO3 activation-acid leaching process. The findings of this review provide theoretical guidance for novel developments and applications of aluminum extraction technologies.

Acknowledgments

We greatly acknowledge the financial support provided by the National Key Research and Development Program (no. 2017YFB0603105).

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Received: 2019-06-09
Accepted: 2020-01-04
Published Online: 2020-02-14
Published in Print: 2021-11-25

©2020 Walter de Gruyter GmbH, Berlin/Boston

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