石膏/偏高岭土对二次铝灰中氟离子的固化研究

doi:10.11896/cldb.21090018

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Abstract The secondary aluminum dross (SAD) contains toxic substances, such as fluoride, nitride, carbide and so on. It has important environmental significance for the safe disposition of SAD. In this study, fluoride ions in SAD were solidified with flue gas desulfurization gypsum (FGDG) by calcium salt precipitation method. Then, metakaolin (MK) was added to improve the water resistance of FGDG-SAD cementitious system. The fluorine ions dissolution performance and water resistance of FGDG-SAD and FGDG-MK-SAD were studied by using different proportions. The solidification mechanism of fluoride ion in SAD was analyzed by XRD, SEM and thermodynamic parameters. The results show that FGDG can reacted with soluble fluoride ions in SAD to form calcium fluoride, which has a good solidification effect on fluoride ions. However, FGDG-SAD cementitious system has poor water resistance. The water resistance of FGDG-SAD cementitious system can be significantly improved by replacing FGDG with an appropriate amount of MK, and has no adverse effect on the fluoride ion solidification. The research results provide theoretical guidance for the safe disposal and resource utilization of SAD.

Key words： secondary aluminum dross desulfurization gypsum metakaolin fluoride ion leaching resistance to water

Published: 10 April 2023 Online: 2023-04-07

CLC number:

X758

Fund:Department of Science and Technology of Shaanxi Province (2018SF-367).

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	SONG Xuefeng
	YANG Erkang

Cite this article:

SONG Xuefeng,YANG Erkang. Study on Solidification of Fluoride Ion in Secondary Aluminum Dross by Gypsum/Metakaolin[J]. Materials Reports, 2023, 37(7): 21090018-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21090018 OR http://www.mater-rep.com/EN/Y2023/V37/I7/21090018

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