重度铜污染土壤制备轻集料的固化机理研究

doi:10.11896/cldb.20080025

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Abstract It is considered to be a safe and reliable resource disposal technology to prepare light aggregate from contaminated soil containing heavy me-tals. So, clarifying the solidification mechanism of heavy metals in the preparation of light aggregates is of great significance to the reasonable formulation of corresponding processes and technical routes. In this paper, by adding a small amount of copper oxide into the contaminated soil, the solidification and solidification limit of copper in contaminated soil by high temperature sintering were studied. The mechanism of copper solidification in light aggregate and the influence of copper on the properties of light aggregate were discussed. The results show that copper oxide has a strong fusing effect in the light aggregate sintering process. Generally speaking, the solidification rate of copper is related to the valence state and dosage at 1 200 ℃ sintering temperature. When the copper content is less than 1.5%, the heavy metal solidification effect of light aggregate is better, and the solidification rate ranges from 99.6% to 99.99%. Because the content of copper in contaminated soil is usually less than 0.2%, it is safe to prepare light aggregate from solid waste containing a small amount of copper oxide. XRD results show that the crystal phase of lightweight aggregate is mainly composed of quartz, high-temperature quartz, hematite and mullite. And the solidification of copper is closely related to high-temperature quartz, which can be speculated that the curing mechanism is due to the coordination of copper ions with silica tetrahedron.

Key words： copper pollution high temperature curing curing mechanism heat treatment light aggregate

Published: 30 September 2021

CLC number:

TQ17

Fund:This work was financially supported by the National Key R & D Program of China (2017YFC0703202) and the Key R & D Program of Hubei Province(2020BCA077).

About author:: Shouwei Jian received his doctorate from Wuhan University of Technology in May 2008, he is currently working as an associate professor at School of Materials Science and Engineering, Wuhan University of Techno-logy. Now, he is mainly engaged in waste recycling, preparation of green building materials, environmental function building materials, other new cement-based materials.

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	JIAN Shouwei
	ZHAO Hongchen
	WANG Liang
	LI Baodong
	GAO Wenbin
	HUANG Weichao

Cite this article:

JIAN Shouwei,ZHAO Hongchen,WANG Liang, et al. Study on Solidification Mechanism of Light Aggregate Prepared from Heavy Copper Contaminated Soil[J]. Materials Reports, 2021, 35(18): 18104-18108.

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http://www.mater-rep.com/EN/10.11896/cldb.20080025 OR http://www.mater-rep.com/EN/Y2021/V35/I18/18104

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