Aleksandar Jovanović, Dimitrije Anđić
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.
@article{9eda9a20-04f4-49f2-828f-01da9782c581,
title={2025 Jovanovic MnO2 KI oxidative leaching of sphalerite concentrate},
author={Aleksandar Jovanović and Dimitrije Anđić},
year={2026},
language={en}
}TY - JOUR TI - 2025 Jovanovic MnO2 KI oxidative leaching of sphalerite concentrate AU - Aleksandar Jovanović AU - Dimitrije Anđić PY - 2026 LA - en ER -
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