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High-temperature phase relations and thermodynamics in the iron-lead-sulfur system

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Abstract

The PbS activities in FeS-PbS liquid mattes were obtained at 1100 °C and 1200 °C by the dew-point method. Negative deviations were observed, and the liquid-matte solutions were modeled by the Krupkowski formalism. The liquid boundaries of the FeS-PbS phase diagram were derived from the model equations yielding a eutectic temperature of 842 °C atX Pbs = 0.46. A phase diagram of the pseudobinary FeS-PbS was also verified experimentally by quenching samples equilibrated in evacuated and sealed silica capsules. No terminal solid solution ranges could be found. Within the Fe-Pb-S ternary system, the boundaries of the immiscibility region together with the tie-line distributions were established at 1200 °C. Activities of Pb were measured by the dew-point technique along the metal-rich boundary of the miscibility gap. Activities of Fe, Pb, and S, along the miscibility gap were also calculated by utilizing the bounding binary thermodynamics, phase equilibria, and tie-lines.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa

    R. Hurman Eric (Professor and Head) & Hakan Ozok (Doctoral Postgraduate Student)

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  1. R. Hurman Eric
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  2. Hakan Ozok
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Eric, R.H., Ozok, H. High-temperature phase relations and thermodynamics in the iron-lead-sulfur system. Metall Mater Trans B 25, 53–61 (1994). https://doi.org/10.1007/BF02663178

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