Substance flow analysis of zinc associated with iron and steel cycle in Japan, and environmental assessment of EAF dust recycling process

Kenichi Nakajima, Kazuyo Matsubae-Yokoyama, Shinichiro Nakamura, Satoshi Itoh, Tetsuya Nagasaka

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30 Citations (Scopus)

Abstract

Japanese zinc production in 2005 was 6.75×106t, and domestic demand of zinc was 4.82×105t. The main use of metallic zinc is in the surface coating of steel and the metal accounts for 62.8% of the domestic demand. The purposes of this study are as follows: (1) to identify the material flow of zinc associated with steel production, and (2) to estimate the environmental effects (energy consumption and CO2 emission reduction) of some intermediate dust treatment processes. The major conclusions are (a) In Japan, 6.16×106t of blast furnace/converter dust was generated In 2000, and this product contained 2.20×104t-Zn. 0.433×106t of EAF dust was generated and this dust contained 8.86×104t-Zn, and (b) 9.57 MJ of energy is required for producing 1 kg of zinc oxide by the Waelz process using EAF dust, and the estimated amount of CO2 emission in this process is 1.49 kg-CO 2. On the other hand, if the LAMS process proposed by the authors is employed, it Is estimated that there will be a reduction of 1.70 MJ in energy consumption and a reduction of 0.14 kg-CO2 in CO2 emissions.

Original languageEnglish
Pages (from-to)1478-1483
Number of pages6
JournalISIJ International
Volume48
Issue number10
DOIs
Publication statusPublished - 2008 Dec 24

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Keywords

  • Iron and steel
  • Material flow analysis
  • Recycling
  • Substance flow analysis
  • Zinc

ASJC Scopus subject areas

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

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