Activity of P2O5 in Solid Solution between Di-calcium Silicate and Tri-calcium Phosphate at 1 823 and 1 873 K

作者：Zhong, Ming; Matsuura, Hiroyuki^*; Tsukihashi, Fumitaka

来源：ISIJ International, 2015, 55(11): 2283-2288.

DOI：10.2355/isijinternational.ISIJINT-2015-019

• thermodynamics
• steelmaking
• multi-phase fluxes
• activity of P2O5
• partition ratio of phosphorus
• solid solution
• 2CaO center dot SiO2-3CaO center dot P2O5

By applying the chemical equilibrium method, the equilibrium between liquid iron and 2CaO center dot SiO2-3CaO center dot P2O5 solid solution has been measured with oxygen partial pressure of 5.22 x 10(-12) atm at 1 823 K and 1.41 x 10(-11) atm or 4.25 x 10(-10) atm at 1 873 K. The phosphorus partition ratio between 2CaO center dot SiO2-3CaO center dot P2O5 solid solution and liquid iron was observed. The activity of P2O5 relative to hypothetical pure liquid P2O5 was determined from the phosphorus content in liquid iron and the reported thermodynamic data. The activity of P2O5 in 2CaO center dot SiO2-3CaO center dot P2O5 solid solution increased with the increase of 3CaO center dot P2O5 content in solid solution. The activity coefficient of P2O5 in 2CaO center dot SiO2-3CaO center dot P2O5 solid solution also increased with the increase of 3CaO center dot P2O5 content in solid solution.

• 出版日期2015