New pyrometallurgical process of EAF dust treatment with CaO addition

Romchat Chairaksa-Fujimoto, Yosuke Inoue, Naoyoshi Umeda, Satoshi Itoh, Tetsuya Nagasaka

Research output: Contribution to journalArticle

15 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)788-797
Number of pages10
JournalInternational Journal of Minerals, Metallurgy and Materials
Volume22
Issue number8
DOIs
Publication statusPublished - 2015 Aug 8

Keywords

  • calcium oxide
  • electric arc furnace dust
  • pyrometallurgy
  • zinc ferrite
  • zinc oxide

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Geochemistry and Petrology
  • Metals and Alloys
  • Materials Chemistry

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