铅冶炼渣基生态胶凝材料的研发及重金属固化

doi:10.11896/cldb.22120057

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Abstract Lead smelting slag (LSS) is a hazardous waste containing heavy metals (Cr, Ni, Cu, Zn, As, and Pb), and its improper disposal can cause irreversible harm to the ecosystem. In this study, the ecological cementitious materials were prepared by using lime ash slag (LAS), bischofite (BF), slag powder (SP) and proper amount of cement (CM) co-excited LSS. The ideal cementitious material ratio was discovered through orthogonal tests, and the effects of various variables on the compressive strength of ecological cementitious materials were discussed. XRD, SEM, FTIR, and the sulfuric acid nitrate method were used to examine the properties of the cementitious materials' hydration products as well as the leaching law of heavy metals. The results show that when the mass ratio of LSS to cement is 3∶1, and the external admixture of lime ash slag, bischofite and mineral powder is 20%, 10% and 10% of the sum of the mass of LSS and cement respectively, the compressive strength of the prepared ecological cementitious material is optimal, and the 28 d compressive strength reaches 40.9 MPa, and the admixture of mineral powder is the first factor affecting its compressive strength. Microscopic analysis shows that the hydration products of the cementitious material are mainly Friedel's salt, calcite, C-S-H and C/M-A-S-H, which are interlinked to form a dense spatial network structure, which help to improve the mechanical properties of the cementitious material. The cementation solidification ratio of the cementitious material for the main heavy metals is greater than 83%, and the leaching solution concentration of heavy metals meets the requirements of the sanitary standard for domestic drinking water (GB5749-2006).

Key words： lead smelting slag ecological cementitious material compressive strength hydration product heavy metal leaching solution concentration

Published: 25 March 2024 Online: 2024-04-07

CLC number:

TU526

Fund:National Key Research and Development Program of China (2018YFC1903804,2021YFB3802003).

Corresponding Authors: ^*sunshine_lihui@126.com

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	Articles by authors
	LIU Wenhuan
	HU Jing
	ZHAO Zhongzhong
	DU Renhao
	WAN Yongfeng
	LEI Fan
	LI Hui

Cite this article:

LIU Wenhuan,HU Jing,ZHAO Zhongzhong, et al. Development and Heavy Metal Solidification of Lead Smelting Slag-based Ecological Cementitious Materials[J]. Materials Reports, 2024, 38(6): 22120057-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22120057 OR http://www.mater-rep.com/EN/Y2024/V38/I6/22120057

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