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Removal of Pb from Molten Copper by FetO-SiO2 (-CaO, Al2O3) Slag Treatment in Mitsubishi Process

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Celebrating the Megascale

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Abstract

The distribution behavior of Pb between molten copper and FetO-SiO2 (-CaO, Al2O3) slags was investigated at 1473 K (1200 °C) and p(O2)=10-10 atm in view of the reaction mechanism of Pb dissolution into the slag. The distribution ratio of Pb (L Pb) decreases with increasing CaO content (~6 mass pct) irrespective of Fe/SiO2 ratio (1.4~1.7). However, the addition of alumina into a slag with Fe/SiO2=1.5 linearly decreases the L Pb, whereas a minimum value is observed at about 4 mass pct Al2O3 at Fe/SiO2=1.3. The log L Pb continuously decreases with increasing Fe/SiO2 ratio, and the addition of Al2O3 (5 to 15 mass pct) into the silica-saturated iron silicate slag (Fe/SiO2 > 1.0) yields the highest Pb distribution ratio. The log LPb linearly decreases by increasing the log (Fe3+/Fe2+) value. The Pb distribution ratio increases and the excess free energy of PbO decreases with increasing Cu2O content in the slag. However, from the viewpoint of copper loss into the slag, the silica-saturated system containing small amounts of alumina is strongly recommended to stabilize PbO in the slag phase at a low Cu2O content.

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Author information

Authors and Affiliations

  1. Metals and Materials Research Department, LS-Nikko Copper, Ulsan, 70, Korea

    Soo Sang Park

  2. Department of Materials Engineering, Hanyang University, Ansan, 426-791, Korea

    Joo Hyun Park

Authors
  1. Soo Sang Park
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  2. Joo Hyun Park
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Editor information

Editors and Affiliations

  1. Curtin University, Australia

    Eric J. Grimsey (emeritus professor of minerals engineering, chair of the institute’s Ethics Committee) (emeritus professor of minerals engineering, chair of the institute’s Ethics Committee)

  2. AusIMM, Australia

    Eric J. Grimsey (emeritus professor of minerals engineering, chair of the institute’s Ethics Committee) (emeritus professor of minerals engineering, chair of the institute’s Ethics Committee)

  3. Pyrometallurgy Division, Mintek, South Africa

    Rodney T. Jones

  4. Faculty of Engineering and Industrial Sciences, High Temperature Processing research group, Swinburne University of Technology, Australia

    Geoffrey A. Brooks (professor, leads) (professor, leads)

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© 2014 TMS (The Minerals, Metals & Materials Society)

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Park, S.S., Park, J.H. (2014). Removal of Pb from Molten Copper by FetO-SiO2 (-CaO, Al2O3) Slag Treatment in Mitsubishi Process. In: Mackey, P.J., Grimsey, E.J., Jones, R.T., Brooks, G.A. (eds) Celebrating the Megascale. Springer, Cham. https://doi.org/10.1007/978-3-319-48234-7_21

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