基于二次铝灰的地聚反应稳固化垃圾飞灰

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Abstract A new method for stabilization/solidification of municipal solid waste incineration fly ash (MSWIFA) by geopolymerization based on secondary aluminum dross (SAD) that recycled from the production of aluminum is proposed. The effect of Si/Al molar ratio on the stabilization/solidification of solidified bodies was investigated in the study. When the molar ratio of Si/Al was less than 2.5, the leaching concentration of heavy metals such as Cr, Cd, Pb, Zn and Cu in SAD-SiO₂-based and metakaolin-SiO₂-based solidified bodies decreased significantly and the compressive strength of the cured solidified bodies increased obviously with the enhancement of the Si/Al molar ratio. When the Si/Al molar ratio exceeded 2.5, the leaching concentration of heavy metals and the compressive strength of both the solidified bodies tended to be stable. The result of XRD analysis suggested that the categories and contents of polymers in metakaolin-SiO₂-based solidified bodies were slightly higher than SAD-SiO₂-based solidified bodies. However, the disparity between these two sorts of solidified bodies was tiny, which proved that SAD with silica-based materials could be potential substitutes for metakaolin in order to improve the Si/Al molar ratio and thereby ameliorate the consequent of stabilization and solidification. Furthermore, the solidified wastes could be applied to be certain construction materials because the compressive strength of SAD-SiO₂-based solidified bodies could be increased to be 13.65MPa.

Key words： municipal solid waste incineration fly ash secondary aluminum dross Si/Al molar ratio stabilization/solidification heavy metal

Received: 02 March 2020

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X701

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	Articles by authors
	WANG Kai
	WU Xin
	LIANG Cai
	LIU Dao-jie
	LI Jun-hui

Cite this article:

WANG Kai,WU Xin,LIANG Cai等. Experimental study on the stabilization/solidification of MSWIFA by geopolymerization based on secondary aluminum dross[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4421-4428.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4421

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