Study on the foaming of CaO-SiO2-FeO slags: Part I. Foaming parameters and experimental results

Kimihisa Ito*, R. J. Fruehan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

190 Citations (Scopus)


In order to understand the effect of slag composition on foaming in iron and steelmaking processes, slag foaming was quantitatively studied for CaO-SiO2-FeO slags in the temperature range of 1250 °C to 1400 °C. It was found that slag foaming could be characterized by a foaming index (Σ), which is equal to the retention or traveling time of the gas in the slag, and the average foam life ( τ). The effects of P2O5, S, MgO, and CaF2 on foaming were studied. As expected, slag foaming increased with increasing viscosity and decreasing surface tension. It was found that suspended second-phase solid particles such as CaO, 2CaO SiO2, and MgO stabilized the foam and had a larger effect on foaming than changes in viscosity and surface tension for the slags studied.

Original languageEnglish
Pages (from-to)509-514
Number of pages6
JournalMetallurgical Transactions B
Issue number4
Publication statusPublished - 1989 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)


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