Citation: LI Yang, HE Yong-lai, JIN Li-jun, LIU Jing-chao, HU Hao-quan. Leaching characteristics of trace elements in hetero-aggregation fly ash from coal-fired power plant[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(11): 1394-1401. shu

Leaching characteristics of trace elements in hetero-aggregation fly ash from coal-fired power plant

1.
State Key Laboratory of Fine Chemicals, Institute of Coal Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
2.
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding author: HU Hao-quan, hhu@dlut.edu.cn
Received Date: 11 September 2020
Revised Date: 13 November 2020

Fund Project: the Fundamental Research Funds for the Central Universities DUT2018TB0National Key R & D Program of China 2018YFB0605104The project was supported by National Key R & D Program of China (2018YFB0605104), National Natural Science Foundation of China (21776039) and the Fundamental Research Funds for the Central Universities (DUT2018TB0)National Natural Science Foundation of China 21776039

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This paper studied physicochemical and leaching characteristics of three hazardous trace elements As, Se and Pb in hetero-aggregation fly ash (HAFA) and coal fly ash (FA)samples which were collected from coal-fired power plant. The results show that the peak of particle size of HAFA is 138.04 and is 60.26 μm of FA; the fine particles agglomerate into large particles after agglomeration; the contents of heavy metals of As, Se and Pb in HAFA are all higher than those of in FA. The content of heavy metals in gypsum produced in the subsequent desulfurization process is decreased. The batch leaching experiments show that leaching concentrations of three metals in HAFA are suppressed by mild and alkaline condition for As, by acidic and alkaline condition for Se, and by alkaline condition for Pb. The column leaching experiments show that the leaching abilities of the trace elements in HAFA are inhibited in both acidic and aqueous solution.
- fly ash,
- hetero-aggregation,
- particles,
- trace elements,
- leaching
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沈阳化工大学材料科学与工程学院沈阳 110142