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Li D, Liang Y, Wang H, Zhou R, Yan X, Wang L, Zhang H. Investigation on the effects of fluid intensification based preconditioning process on the decarburization enhancement of fly ash. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2021.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Gao Y, Liang K, Gou Y, Wei S, Shen W, Cheng F. Aluminum extraction technologies from high aluminum fly ash. REV CHEM ENG 2020. [DOI: 10.1515/revce-2019-0032] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
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.
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Affiliation(s)
- Yajing Gao
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 400044 , China
| | - Kai Liang
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 400044 , China
| | - Yi Gou
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 400044 , China
| | - Shun’an Wei
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 400044 , China
| | - Weifeng Shen
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 400044 , China
| | - Fangqin Cheng
- Institute of Resources and Environment Engineering, State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources , Shanxi University , Taiyuan 030006 , China
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