Solubility of nitrogen in CaO-SiO2-CaF2 slag system

Hyo Seok Song, Peter Chang Hee Rhee, Dong Joon Min

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Equilibrium experiments between gas and slag were carried out to understand the thermodynamic behaviour of nitrogen in the CaO-SiO2-CaF2 slag system at 1600°C. The solubility of nitrogen in this slag system increased as the oxygen potential decreased and as the reaction temperature increased. The values of the nitride capacity have a minimum at about 2.0 slag basicity, having higher values in both more acidic and basic regions. This may be explained by two mechanisms for nitrogen dissolution; incorporated nitride ion and free nitride ion state. In slag with 2.0 basicity or less, MgO content increased the nitride capacity slightly. At higher slag basicity, however, nitride capacity decreased with MgO content. The effects of BaO to substitute CaO on nitride capacity showed similar behaviour as MgO. This complex relationship between basicity of slag and nitride capacity is explained by using optical basicity. It was found that nitride capacity and optical basicity had a close relationship even in the different basic oxide systems.

Original languageEnglish
Pages (from-to)221-226
Number of pages6
JournalSteel Research
Volume67
Issue number6
DOIs
Publication statusPublished - 1996 Jun

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

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