Phosphorus distribution between Mn-Si Melts and CaO-SiO2-MnO-CaF2 slags

Eiji Aida, Min Dong Joon, Nobuo Sano

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10 Citations (Scopus)


Experiments were carried out to investigate the equilibrium distribution ratio of phosphorus (LP) between CaO-SiO2-MnO-CaF2 melts and carbon saturated Mn-Si alloy as a function of oxygen partial pressure, alloy and slag compositions at 1,300°C. The results demonstrate that LP increases with increasing basicity of slag, silicon concentration and oxygen partial pressure. In order to understand quantitatively the effect of silicon concentration on LP, the phosphorus activity coefficient was measured and the interaction parameter, Mn at 1,300°C was found to be 10.7. The CaO equivalent of MnO for dephosphorization was 0.4±0.1 in terms of weight percent. By measuring the manganese activity, the activity coefficient of MnO in the range of the slag composition was calculated to be in the range of 0.42 to 0.62. The critical oxygen partial pressure between the stability of phosphate and phosphide in this slag system was about 10-18.4 atm at 1,300°C.

Original languageEnglish
Pages (from-to)1931-1938
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Issue number10
Publication statusPublished - 1988

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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