Mechanism of Smelting Reduction of Spinel Solid Solution Mg(Cr<SUB>0.6</SUB>Al<SUB>0.4</SUB>)<SUB>2</SUB>O<SUB>4</SUB>

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  • Shimoo Toshio
    Department of Metallurgical Engineering, College of Engineering, University of Osaka Prefecture
  • Konishi Yoshihiro
    Department of Metallurgical Engineering, College of Engineering, University of Osaka Prefecture

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Other Title
  • スピネル固溶体Mg(Cr<SUB>0.6</SUB>Al<SUB>0.4</SUB>)<SUB>2</SUB>O<SUB>4</SUB>の溶融還元機構
  • スピネル固溶体Mg(Cr0.6Al0.4)2O4の溶融還元機構
  • スピネル コヨウタイ Mg Cr 0.6 Al 0.4 2 O 4 ノ ヨウユ

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Abstract

In the relation to the smelting reduction of chromite ore, the kinetics of reduction of Mg(Cr0.6Al0.4)2O4 in silicate fluxes with graphite has been investigated at temperatures from 1773 to 1973 K. The reduction rate was strongly dependent on the wetting of the flux to the graphite. The contact area of the flux with the graphite decreased with increasing the basicity B of flux. The reduction rate was described with a 1st-order-type rate equation: log(1−R)=−k·t. The rate constant k reduced abruptly, when the value of B exceeded 1. The activation energy for the viscous flux was larger than that for the fluid slag. The addition of SiC to flux increased the reduction rate, because of the excellent wettability of the flux to the graphite. It is considered that the reduction rate is controlled by the mass transfer of chromium oxide in flux or the chemical reaction at the flux-graphite interface.

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