Reduction of electric arc furnace dust by graphite powders under microwave irradiation

E. Kim, T. Kim, J. Lee, Y. Kang, K. Morita

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Electric arc furnace dust was reduced by graphite powder under microwave irradiation. After Zn was removed as a vapour, Fe was successfully recovered as a metal drop after 300 s microwave irradiation (2.45 GHz, 1.7 kW). The maximum temperature and heating rate increased with increasing carbon equivalent Ceq (the mole ratio of carbon/oxygen to reduce ZnFe 2O 4 and ZnO, yielding CO gas). The maximum recovery ratio of Fe (0.87) was obtained when C eq=1. A glassy slag phase, with environmentally harmful elements fixed within, was obtained by SiO 2 addition. However, with increasing SiO 2 addition, the recovery ratio of Fe decreased. It was considered that the heat generated on the surface of the graphite was partially used to increase the temperature of the added SiO 2, and the duration at the maximum temperature decreased with increasing SiO 2 addition. Consequently, the optimised condition for the reduction of electric arc furnace dust was obtained with addition of 6% graphite and 2.4%SiO 2 powders under microwave irradiation for 300 s.

Original languageEnglish
Pages (from-to)45-50
Number of pages6
JournalIronmaking and Steelmaking
Volume39
Issue number1
DOIs
Publication statusPublished - 2012 Jan

Keywords

  • Electric arc furnace dust
  • Microwave irradiation
  • Recovery ratio of Fe
  • Reduction

ASJC Scopus subject areas

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

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