A kinetic model to predict the compositions of metal, slag and inclusions during ladle refining: Part 1. basic concept and application

Akifumi Harada, Nobuhiro Maruoka, Hiroyuki Shibata, Shin Ya Kitamura

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

A kinetic model to predict chemical composition changes in molten steel, slag, and inclusions in ladle refining was developed and used to elucidate the mechanism underlying the change in the chemical composition of the inclusions. The coupled reaction model was applied to estimate the reaction between molten steel/slag and molten steel/inclusion originating from the slag. The thermodynamic calculation software, FactSage6.3, was employed to obtain the activity of each component in the slag phase. Empirical equations were applied to the reaction between the slag and the refractory. The resulting model can calculate changes in (1) the composition of each element in the molten steel, slag, and the inclusion originating from the slag, (2) the amount of inclusion originating from the slag and the deoxidation products, and (3) the ratio of the inclusion originating from the slag and the deoxidation products to the total inclusion. The calculated results were found to agree with the operational results of a 165 t ladle refining process reported in the literature. The deoxidation products altered from alumina to a MgO·Al2O 3 spinel-type inclusion due to an increase in the Mg content of steel. In the average composition changes of each element in the total inclusions, calculated results for the MgO and Al2O3 contents were also found to agree with the operational results.

Original languageEnglish
Pages (from-to)2110-2117
Number of pages8
JournalIsij International
Volume53
Issue number12
DOIs
Publication statusPublished - 2013 Dec 1

Keywords

  • Composition change
  • Inclusion
  • Kinetic simulation
  • Ladle metallurgy
  • Spinel

ASJC Scopus subject areas

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

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