Secondary aluminum dross self-heating enhances hazardous waste vitrification.

IF 7.1 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Yuyang Long, Yuhe Song, Xitong Wang, Xiaohui Sun, Zhengdong Peng, Dongsheng Shen, Ying Kang, Foquan Gu
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引用次数: 0

Abstract

This study demonstrates the potential of secondary aluminum dross (SAD) to enhance the vitrifying hazardous waste incineration fly ash (FA) and bottom slag (BS). Based on the CaO-SiO2-Al2O3 ternary phase diagram, a liquid phase can be achieved at relatively low temperatures by carefully adjusting the Al2O3 content, particularly when the CaO to SiO2 ratio is around 0.66. Theoretical melting temperature calculations indicate that substituting Al2O3 reagent with SAD enables the vitrification of FA and BS at temperatures below 1300 °C. TG-DSC results confirm this theoretical prediction, showing that the mixed system of FA, BS, and SAD lowers the liquid-phase formation temperatures compared to FA, BS, and SAD individually. Vitrification experiments, employing a composition of 55 wt%-60.5 wt% FA, 34 wt%-39 wt% BS, and 0.5 wt%-11 wt% SAD, achieved successful vitrification at 1350 °C for 2 h. This resulted in a high-quality vitrified product with a vitreous content exceeding 87.38%, an acid dissolution loss ratio below 2.32%, and heavy metals leaching toxicity below 0.15 mg/L. The exothermic nature of aluminum in SAD during the melting process contributes to enhance vitrification, making SAD a promising alternative to Al2O3 reagent.

二次铝渣自热增强了危险废物的玻璃化。
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来源期刊
Waste management
Waste management 环境科学-工程:环境
CiteScore
15.60
自引率
6.20%
发文量
492
审稿时长
39 days
期刊介绍: Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)
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