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Distribution of Gold and Silver between Copper and Matte

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Abstract

The distribution coefficients of silver and gold between copper and matte phases have been measured at 1400 and 1500 K. For 0.07 to 0.13 wt pct silver and 0.0022 to 0.0042 wt pct gold in ironfree matte, the distribution coefficients of silver and gold are independent of concentration. For iron-bearing matte, the distribution coefficients of silver and gold are correlated with iron content of the matte. From the measured values of the distribution coefficients of silver and gold, the activity coefficients of AgS0.5 and Au in copper-saturated matte have been calculated. The following correlations express these results: log γ°AgS0.5(1) = -425/T - 0.074 + 0.09NFeS, log γ°Au(1) =-7620/T + 7.25 forT = 1400 to 1500 K and NFeS, mole fraction of FeS = 0 to 0.28. The present values of the activity coefficients of AgS0.5 must be used exclusively in conjunction with the following Gibbs free energy of formation: 2Ag(l) + 1/2S2(g) = Ag2S(l), ΔG° = -23960 + 10.295T (cal/mol).

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Authors and Affiliations

  1. Department of Metallurgy, The University of Utah, 84112-1183, Salt Lake City, UT

    S. N. Sinha (Graduate Student)

  2. Department of Metallurgy and Metallurgical Engineering, The University of Utah, 84112-1183, Salt Lake City, UT

    H. Y. Sohn (Professor)

  3. Centre de Recherches Minérales, Quebec Government, 2700 Einstein, PQ G1P 3W8, Ste-Foy, Canada

    M. Nagamori

Authors
  1. S. N. Sinha
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  2. H. Y. Sohn
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  3. M. Nagamori
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M. Nagamori, formerly Associate Professor of Metallurgy at The University of Utah.

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Sinha, S.N., Sohn, H.Y. & Nagamori, M. Distribution of Gold and Silver between Copper and Matte. Metall Trans B 16, 53–59 (1985). https://doi.org/10.1007/BF02657488

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