A theoretical model for assessing the influence of n2 on gaseous reduction of iron ores with CO or H2

Lei Shao, Ko-Ichiro Ohno, Ying Xia Qu, Zong Shu Zou

Research output: Contribution to journalArticle

Abstract

The influence of N2 on gaseous reduction of iron ores has yet to be investigated more rigorously. A generalized theoretical model for iron ore reduction that is featured with equimolar counterdiffusion of gaseous reactant and product in the presence of an inert component is derived in the current paper, where the influence of N2 is quantitatively assessed in terms of a normalized overall reduction rate. The results show that N2 impacts CO reduction of iron ores mainly via the prevailing mechanism of dilution effect and the sole use of DAB in the corresponding ternary system brings merely minor errors. In contrast, especially under conditions of high N2 fraction and reduction degree, the effect of mass diffusion must be borne in mind for H2 reduction and the sole use of DAB can lead to marked errors. The main novelty of the present work is the derivations of the theoretical equations fully following the Maxwell-Stefan relation for multicomponent diffusion and the wellknown concept of topochemical reaction for gaseous reduction of iron ores. It is hoped that the brief discussion will stimulate further application of the theoretical equations to the development of more versatile models and to studies of the engineering type.

Original languageEnglish
Pages (from-to)370-372
Number of pages3
Journalisij international
Volume58
Issue number2
DOIs
Publication statusPublished - Jan 1 2018

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Iron ores
Carbon Monoxide
Iron ore reduction
Ternary systems
Dilution

All Science Journal Classification (ASJC) codes

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

Cite this

A theoretical model for assessing the influence of n2 on gaseous reduction of iron ores with CO or H2. / Shao, Lei; Ohno, Ko-Ichiro; Qu, Ying Xia; Zou, Zong Shu.

In: isij international, Vol. 58, No. 2, 01.01.2018, p. 370-372.

Research output: Contribution to journalArticle

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