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Evaporation and stabilization of the heavy metals in EAF dust-clay bodies

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2005, 15(6), pp.217-221
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Jung-Hwan Kim 1

1경기대학교

Accredited

ABSTRACT

The evaporation amounts of volatile Cd, Pb and Zn were characterized by measuring their total concentrationsin the EAF dust-clay bodies with various mixing ratio and heat treatment temperature. TCLP test was conducted for evaluatingthe chemical stabilities of the heavy metal elements. Evaporation amounts and leaching concentrations of heavy metalcomponents were strongly dependent on the mixing ratio and heat treatment temperature. The evaporation of the heavymetal components were decreased with increasing clay content and temperature. 20 wt% EAF dust-80 wt% clay sampleshows nearly zero evaporation and leaching concentrations of heavy metal components. XRD analysis showed that peakintensities of major crystalline phases such as franklinite and quartz were decreased with increasing the heat treatmenttemperature which means that the stabilization mechanism of the heavy metals was related with the vitrification process ofthe SiO2 in the clay.

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