Study on Solidification Mechanism of Light Aggregate Prepared from Heavy Copper Contaminated Soil
JIAN Shouwei1, ZHAO Hongchen1, WANG Liang2, LI Baodong1, GAO Wenbin1, HUANG Weichao1
1 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430079, China 2 China Construction Third Bureau First Engineering Co., Ltd., Wuhan 430040, China
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.
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2021, Vol. 35 
