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Leaching and stabilization of the heavy metals with pH in EAF dust-clay system  

Lee, Jee-Young (Department of Materials Engineering, Kyonggi University)
Lee, Ki-Gang (Department of Materials Engineering, Kyonggi University)
Kim, Yoo-Taek (Department of Materials Engineering, Kyonggi University)
Kang, Seung-Gu (Department of Materials Engineering, Kyonggi University)
Kim, Jung-Hwan (Department of Materials Engineering, Kyonggi University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.16, no.2, 2006 , pp. 88-93 More about this Journal
Abstract
To recycle the electric arc furnace (EAF) dust as a ceramic raw materials, the leaching concentrations of heavy metals (Zn, Pb, Cr, Cd) were analysed with various pH and mixing ratios for EAF dust and EAF dust-clay mixtures. The evaporation amounts of the some heavy metals were evaluated by measuring their total concentrations in the sintered bodies of EAF dust-clay mixtures with various mixing ratio and sintering temperature. Toxicity characteristic leaching procedure (TCLP) test was conducted for evaluating the chemical stabilities of the heavy metal elements. Leaching concentrations of heavy metal ions shows minimum leaching concentration at the pH 10. Evaporation amount of heavy metals in the sintered bodies were evaluated for the mixtures of pH 10 depenidng on mixing ratio and sintering temperature. Evaporation of heavy metal components were increased with increasing the sintering temperature and contents of the EAF dust. The evaporation of the heavy metal components in EAF dust was effectively suppressed by increasing the clay content. The leaching concentrations of heavy metal components were decreased with increasing clay content and temperature.
Keywords
EAF dust; Recycling; Heavy metal; Leaching; Evaporation;
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