Assessment of P_2O_5Activity Coefficients in Molten Slags

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From a critical review of the existing experimental data, the free energy equations are presented. A new estimate is made of the standard free energy of formation of the hypothetical pure liquid P<sub>2</sub>O<sub>5</sub>, which is used in calculating the P<sub>2</sub>O<sub>5</sub> activity coefficients from the experimental data of independent studies of slag–metal reactions. It is found that in low P<sub>2</sub>O<sub>5</sub> slags, log( γ<sub>P<sub>2</sub>O<sub>5</sub></sub>) is a linear function of CaO from 0 to 60%, independent of temperature. Whereas, in slags containing P<sub>2</sub>O<sub>5</sub> > 10%, log(γ<sub>P<sub>2</sub>O<sub>5</sub></sub>) is a linear function of CaO content > 40% only and increases with an increasing temperature. A novel concept of a slag–P<sub>2</sub>O<sub>5</sub> emf sensor is presented for experimental evaluation.

収録刊行物

  • ISIJ international

    ISIJ international 40(10), 964-970, 2000-10-15

    The Iron and Steel Institute of Japan

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