Aluminum extraction technologies from high aluminum fly ash

被引：33

作者：

Gao, Yajing ^{[1
]}

Liang, Kai ^{[1
]}

Gou, Yi ^{[1
]}

Wei, Shun'an ^{[1
]}

Shen, Weifeng ^{[1
]}

Cheng, Fangqin ^{[2
]}

机构：

[1] Chongqing Univ, Sch Chem & Chem Engn, Chongqing 400044, Peoples R China

[2] Shanxi Univ, Inst Resources & Environm Engn, State Environm Protect Key Lab Efficient Utilizat, Taiyuan 030006, Peoples R China

来源：

REVIEWS IN CHEMICAL ENGINEERING | 2021年 / 37卷 / 08期

关键词：

aluminum extraction technologies; coal fly ash; sintering leaching; waste solid management; SODA SINTER PROCESS; HIGH-TEMPERATURE; COAL GANGUE; THERMAL-ACTIVATION; FLUIDIZED-BED; BY-PRODUCTS; FEED COALS; RECOVERY; KINETICS; COMBUSTION;

D O I：

10.1515/revce-2019-0032

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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.

引用

页码：885 / 906

页数：22

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