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The nitrogen reaction between carbon saturated Iron and Na2O-SiO2 Slag: Part 1. Thermodynamics

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Abstract

The nitrogen partition ratio between Na2O-SiO2 slags and carbon saturated iron was measured for slags containing from 0.4 to 0.55 mole fraction of Na2O and the temperature range 1200° to 1350 °C. The nitrogen is dissolved in the slag as the cyanide ion (CN−) and the partition ratio is proportional to the oxygen pressure to the −1/4 power as predicted for CN− dissolution. The oxygen pressure for carbon saturated iron silicon alloys is controlled by the Si (metal)-SiO2 (slag) equilibrium. The nitrogen partition ratio and the cyanide capacity increase with Na2O content and temperature. Calculations indicate that Na2O-SiO2 slags will absorb three times more nitrogen than CaO-Al2O3 slags at the same basicity and temperature. Based on thermodynamic calculations it is estimated that for a typical Na2CO3 hot metal treatment, half of the nitrogen in the metal could possibly be removed.

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Authors and Affiliations

  1. Department of Metallurgical Engineering and Materials Science, Carnegie-Mellon University, 15213, Pittsburgh, PA

    F. Tsukihashi (Research Associate)

  2. Department of Metallurgical Engineering and Materials Science, Carnegie-Mellon University, 15213, Pittsburgh, PA

    R. J. Fruehan (Professor)

Authors
  1. F. Tsukihashi
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  2. R. J. Fruehan
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F.Tsukihashi is on leave of absense from Department of Metallurgical Engineering and Materials Science, Faculty of Engineering, The University of Tokyo, Bunkyo, Tokyo 113, Japan

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Tsukihashi, F., Fruehan, R.J. The nitrogen reaction between carbon saturated Iron and Na2O-SiO2 Slag: Part 1. Thermodynamics. Metall Trans B 17, 535–540 (1986). https://doi.org/10.1007/BF02670220

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  • DOI: https://doi.org/10.1007/BF02670220

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