Determination of interfacial reaction rate constant of nitrogen between N₂–CO₂–CO–Ar and molten iron using isotope exchange technique

Abstract

The application of CO₂ in the steelmaking process has yielded promising results, demonstrating a certain capability for nitrogen removal. To accurately determine the kinetic parameters of nitrogen reactions at the iron melt interface under CO₂ injection conditions, an isotope exchange technique was employed. This technique was used to monitor the evolution of the nitrogen isotopic composition during the reaction between a ²⁸N₂–³⁰N₂–CO₂–CO–Ar gas mixture and an iron melt of controlled composition. The kinetic parameters of nitrogen were subsequently calculated for various CO₂/CO ratios. Furthermore, the dissociation rate determining model was applied to establish the relationship between the interfacial reaction rate constant (k_c) and the activity of surfactive elements (O, C, and S) in molten iron (a_O, a_C, and a_S), expressed as

k_c=\frac{4.35\times {10}^{-6}}{{(1+14.25a_{\mathrm{O}}+0.25a_{\mathrm{C}}+6.50a_{\mathrm{S}})}^2}

\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$${k_c} = {{4.35 \times {{10}^{- 6}}} \over {{{({1 + 14.25{a_{\rm{O}}} + 0.25{a_{\rm{C}}} + 6.50{a_{\rm{S}}}})}^2}}}$$\end{document}

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Keywords

CO₂ injection steelmaking / kinetics / interfacial reaction rate constant / isotope exchange technique

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University of Science and Technology Beijing