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Solubility of nitrogen and carbon in CaO-Al2O3 melts in the presence of graphite

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Abstract

CaO-Al2O3 slags were melted in graphite crucibles under N2–CO–Ar gas mixtures at 1600°C. The contents of total nitrogen, cyanide and total carbon of the slags were determined by chemical analyses of quenched samples taken by suction from the melt. The nitrogen is present in the melt as nitride N−3 ion and cyanide CN−1 ion, and carbon as cyanide and carbide C 2−2 ion. The equilibrium constants for the respective reactions were evaluated. It is found that the nitride capacity of the melt decreases whereas the cyanide and carbide capacities increase with increasing CaO/Al2O3 ratio.

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Authors and Affiliations

  1. Metallurgical Department, Max-Planck-Institut für Eisenforschung GmbH, 4000 Düsseldorf, Germany

    Klaus Schwerdtfeger & Hans Georg Schubert

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  1. Klaus Schwerdtfeger
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  2. Hans Georg Schubert
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Schwerdtfeger, K., Schubert, H.G. Solubility of nitrogen and carbon in CaO-Al2O3 melts in the presence of graphite. Metall Trans B 8, 535–540 (1977). https://doi.org/10.1007/BF02669327

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  • DOI: https://doi.org/10.1007/BF02669327

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