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

  • Soo Sang Park
  • Joo Hyun Park
Conference paper

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 (LPb) 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 LPb, whereas a minimum value is observed at about 4 mass pct Al2O3 at Fe/SiO2=1.3. The log LPb 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.

Keywords

Pb distribution ratio Copper smelting slag Fe3+/Fe2+ ratio Mitsubishi process 

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Copyright information

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

Authors and Affiliations

  • Soo Sang Park
    • 1
  • Joo Hyun Park
    • 2
  1. 1.Metals and Materials Research Department, LS-Nikko CopperUlsanKorea
  2. 2.Department of Materials EngineeringHanyang UniversityAnsanKorea

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