Phase relationship for the CaOSiO2FeO5 mass%P2O 5 System with Oxygen Partial Pressure of 10-8 atm at 1673 and 1623K

Xu Gao, Hiroyuki Matsuura, Il Sohn, Wanlin Wang, Dong Joon Min, Fumitaka Tsukihashi

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Dephosphorization process by using multiphase flux requires smaller slag amount than conventional process, while the high refining efficiency can still be achieved, due to the promotion of the CaO utilization. In order to provide proper phase diagram for understanding the reaction mechanism, the phase relationship for the CaOSiO2FeO5 mass%P2O 5 quaternary system has been studied with oxygen partial pressure of 1010-8 atm at 1673 and 1623K by using chemical equilibration technique. It has been found that the solid solution exists only as 2CaOSiO 23CaO P2O5, and the ratio between both varies with liquid phase compositions. On the other hand, the liquidus for both 1673 and 1623K that saturated with above solid solution, moves close to the FeO apex comparing with the CaOSiO2FeOx system equilibrated with iron. Besides, the large phosphorus partition ratio between solid solution and liquid slag has also been found, which agrees well with previous works. Based on the regular solution model, both activities and activity coefficients of P 2O5 have been discussed.

Original languageEnglish
Pages (from-to)544-552
Number of pages9
JournalMaterials Transactions
Issue number4
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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