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Recovery of Cu and Fe from a Sphalerite Concentrate by the MnO2–KI Leaching Oxidation System

Aleksandar Jovanović, Dimitrije Anđić

2025ensphaleriteleachingcopperironoxidation

Abstract

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This study examined the leaching behavior of copper and iron from a sphalerite concentrate in sulfuric acid utilizing an ensemble MnO2–KI oxidizing system. The temperature was shown to significantly influence the leaching kinetics, with the efficiency notably improving between 40 ◦C and 80 ◦C. The introduction of KI affected the balance between sulfur passivation and oxidant availability, facilitating increased leaching efficiencies. At 3 wt% KI, maximum recoveries of 82.1% Cu and 85.3% Fe were achieved, which indicates a notable decrease in surface passivation. Kinetic study analysis revealed low activation energies of 28.90 kJ mol−1 for copper and 18.94 kJ mol−1 for iron, indicating that both processes proceed readily at moderate temperature regimes. Despite being diffusion-controlled, the mechanisms of dissolution are different: iron leaching is more complicated, involving pyrite oxidation, sulfur layer formation, transformation to marcasite, and ultimately iron (III) release.

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Cite This Work

@article{d4c2279e-ccdc-4f21-827d-e560c4c1338d,
  title={Recovery of Cu and Fe from a Sphalerite Concentrate by the MnO2–KI Leaching Oxidation System},
  author={Aleksandar Jovanović and Dimitrije Anđić},
  year={2025},
  language={en}
}
TY  - JOUR
TI  - Recovery of Cu and Fe from a Sphalerite Concentrate by the MnO2–KI Leaching Oxidation System
AU  - Aleksandar Jovanović
AU  - Dimitrije Anđić
PY  - 2025
LA  - en
ER  -

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