Scholarlink

<p>The application of CO<sub>2</sub> 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 CO<sub>2</sub> 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 <sup>28</sup>N<sub>2</sub>–<sup>30</sup>N<sub>2</sub>–CO<sub>2</sub>–CO–Ar gas mixture and an iron melt of controlled composition. The kinetic parameters of nitrogen were subsequently calculated for various CO<sub>2</sub>/CO ratios. Furthermore, the dissociation rate determining model was applied to establish the relationship between the interfacial reaction rate constant (<i>k</i><sub>c</sub>) and the activity of surfactive elements (O, C, and S) in molten iron (<i>a</i><sub>O</sub>, <i>a</i><sub>C</sub>, and <i>a</i><sub>S</sub>), expressed as <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({k_c} = {{4.35 \times {{10}^{- 6}}} \over {{{({1 + 14.25{a_{\rm{O}}} + 0.25{a_{\rm{C}}} + 6.50{a_{\rm{S}}}})}^2}}}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <msub> <mi>k</mi> <mi>c</mi> </msub> </mrow> <mo>=</mo> <mrow> <mfrac> <mrow> <mn>4.35</mn> <mo>×</mo> <mrow> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mo>−</mo> <mn>6</mn> </mrow> </msup> </mrow> </mrow> <mrow> <mrow> <msup> <mrow> <mo stretchy="false">(</mo> <mrow> <mn>1</mn> <mo>+</mo> <mn>14.25</mn> <mrow> <msub> <mi>a</mi> <mrow> <mrow> <mi mathvariant="normal">O</mi> </mrow> </mrow> </msub> </mrow> <mo>+</mo> <mn>0.25</mn> <mrow> <msub> <mi>a</mi> <mrow> <mrow> <mi mathvariant="normal">C</mi> </mrow> </mrow> </msub> </mrow> <mo>+</mo> <mn>6.50</mn> <mrow> <msub> <mi>a</mi> <mrow> <mrow> <mi mathvariant="normal">S</mi> </mrow> </mrow> </msub> </mrow> </mrow> <mo stretchy="false">)</mo> </mrow> <mn>2</mn> </msup> </mrow> </mrow> </mfrac> </mrow> </math></EquationSource> </InlineEquation>.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

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

  • 期刊论文

  • 发表日期：

    2026年4月17日

查看全文
  • Zhongzi Chen,
  • Yuewen Fan,
  • Xiaojun Hu,
  • Kuochih Chou

摘要

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 (kc) and the activity of surfactive elements (O, C, and S) in molten iron (aO, aC, and aS), expressed as \({k_c} = {{4.35 \times {{10}^{- 6}}} \over {{{({1 + 14.25{a_{\rm{O}}} + 0.25{a_{\rm{C}}} + 6.50{a_{\rm{S}}}})}^2}}}\) k c = 4.35 × 10 − 6 ( 1 + 14.25 a O + 0.25 a C + 6.50 a S ) 2 .