Abstract
Heavy-metal hazardous wastes (HMHW) have a large emission, high toxicity and strong resource properties. Its proper disposal and resource utilization is a key challenge. High-temperature melt vitrification technology is an effective solution to realize the detoxification and resource utilization of HMHW. This paper summarizes and analyzes the control parameters of the existing vitrification treatment of HMHW. The phase transformation process of temperature, slag content, and CAS ratio (CaO-Al2O3-SiO2) in the vitrification treatment of zinc leaching residue (ZLR) was investigated around the vitreous content. The common evolution characteristics of the formed vitrification products in infrared spectrum, UV–vis diffuse reflection spectrum, and microstructures were revealed. The idea of using the maximum UV–vis absorption intensity to qualitatively determine the vitreous content of the products is proposed. Moreover, the correlation between experimental parameters and vitreous content was quantified by combining the data science method, and the mapping of the whole process of ZLR vitrification treatment was constructed. This work provides reliable parameter guidance and method induction for the vitrification treatment of HMHW, especially for wastes with less glassy matrix such as Ca and Si.
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