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Thermodynamics of phosphate and phosphide in CaO-CaF2 melts

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Abstract

The thermodynamics of phosphate and phosphide in CaO-CaF2 melts was studied by equilibrating the melts in a graphite boat with CO-Ar mixtures and Ag-P alloys between 1400 and 1550 ‡C. The dependence of phosphate and phosphide concentrations on the partial pressure of phosphorus, the partial pressure of oxygen, and slag composition confirmed the behavior of P3 and PO 34 in the melts as thermodynamically expected, giving 0.52 and 8.5 x 10−4 as the values for the activity coefficients of Ca3/2PO4 and Ca3/2P, respectively.

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Authors and Affiliations

  1. Department of Metallurgy, Faculty of Engineering, The University of Tokyo, Tokyo, Japan

    S. Tabuchi (Graduate Student) & N. Sano (Professor)

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  1. S. Tabuchi
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  2. N. Sano
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Tabuchi, S., Sano, N. Thermodynamics of phosphate and phosphide in CaO-CaF2 melts. Metall Trans B 15, 351–356 (1984). https://doi.org/10.1007/BF02667339

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  • DOI: https://doi.org/10.1007/BF02667339

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