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New pyrometallurgical process of EAF dust treatment with CaO addition

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Abstract

The non-carbothermic zinc pyrometallurgical processing of electric arc furnace (EAF) dust was investigated on a laboratory scale. The main objective of this process was to convert highly stable zinc ferrite (ZnFe2O4), which accounts for more than half of total zinc in the EAF dust, into ZnO and Ca2Fe2O5 by CaO addition. The EAF dust was mixed with CaO powder in various ratios, pressed into pellets, and heated in a muffle furnace in air at temperatures ranging from 700 to 1100°C for a predetermined holding time. All ZnFe2O4 was transformed into ZnO and Ca2Fe2O5 at a minimum temperature of 900°C within 1 h when sufficient CaO to achieve a Ca/Fe molar ratio of 1.1 was added. However, at higher temperatures, excess CaO beyond the stoichiometric ratio was required because it was consumed by reactions leading to the formation of compounds other than ZnFe2O4. The evaporation of halides and heavy metals in the EAF dust was also studied. These components could be preferentially volatilized into the gas phase at 1100°C when CaO was added.

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Authors and Affiliations

  1. Department of Metallurgy, Graduate School of Engineering, Tohoku University, 6−6−02, Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980−8579, Japan

    Romchat Chairaksa-Fujimoto, Satoshi Itoh & Tetsuya Nagasaka

  2. Toho Titanium Co., Ltd., 3−5−5, Chigasaki, Chigasaki City, Kanagawa, 253−8510, Japan

    Yosuke Inoue

  3. Honda Motor Co., Ltd., 1−13−1, Aoihigashi, Naka-ku Hamamatsu-City Shizuoka, 433−8501, Japan

    Naoyoshi Umeda

Authors
  1. Romchat Chairaksa-Fujimoto
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  2. Yosuke Inoue
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  3. Naoyoshi Umeda
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  4. Satoshi Itoh
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  5. Tetsuya Nagasaka
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Correspondence to Romchat Chairaksa-Fujimoto.

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Chairaksa-Fujimoto, R., Inoue, Y., Umeda, N. et al. New pyrometallurgical process of EAF dust treatment with CaO addition. Int J Miner Metall Mater 22, 788–797 (2015). https://doi.org/10.1007/s12613-015-1135-6

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  • DOI: https://doi.org/10.1007/s12613-015-1135-6

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