Thermodynamics of nitrogen in CaO-SiO2-AI2O3 slags and its reaction with Fe-Csat. melts

Kimihisa Ito, R. J. Fruehan

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

The solubility of nitrogen as the nitride ion in CaO-SiO2-Al2O3 slags in equilibrium with N2-CO gas mixtures and carbon was measured at 1823 K. The nitride capacity (C N3-) was calculated to compare the nitrogen contents measured under different nitrogen and oxygen potentials. C N3- decreased with increasing basicity and by replacing SiO2 with A12O3. The nitrogen partition ratio between carbon saturated iron and the slag was measured in CO gas at one atmosphere at 1823 K. By comparing the partition ratios with the corresponding nitride capacities measured by the gas-slag experiments, it was concluded that the oxygen partial pressure at the slag-metal interface was controlled by the Fe-FeO reaction. A new definition of nitride capacity was proposed based on the reaction between nitrogen and the network former, i.e., SiO2 or A12O3. This capacity could consistently explain the experimental results. Empirical equations were derived to estimate the activity coefficients of silicon and aluminum nitrides in the slags.

Original languageEnglish
Pages (from-to)419-425
Number of pages7
JournalMetallurgical Transactions B
Volume19
Issue number2
DOIs
Publication statusPublished - 1988 Jun
Externally publishedYes

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slags
Slags
Nitrogen
Nitrides
Thermodynamics
nitrides
nitrogen
thermodynamics
Carbon Monoxide
partitions
Carbon
Gases
Oxygen
Aluminum nitride
carbon
aluminum nitrides
Activity coefficients
oxygen
Alkalinity
Silicon nitride

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry
  • Mechanics of Materials

Cite this

Thermodynamics of nitrogen in CaO-SiO2-AI2O3 slags and its reaction with Fe-Csat. melts. / Ito, Kimihisa; Fruehan, R. J.

In: Metallurgical Transactions B, Vol. 19, No. 2, 06.1988, p. 419-425.

Research output: Contribution to journalArticle

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