Pavel Grudinsky, Ekaterina Vasileva
Copper-bearing Waelz slag (CBWS) is a solid by-product of the Waelz process, the disposal of which faces significant environmental challenges. In this study, oxidative sulfuric acid leaching was applied for the recovery of valuable elements from a CBWS sample containing 26.23% Fe, 0.82% Cu, and 0.81% Zn. Experimental leaching was conducted at temperature ranges, durations, and solid-to-liquid (S/L) ratios of 25–90 °C, 5–240 min, and 0.05–0.5 g/cm³, respectively. The consumption rates of H₂SO₄ and H₂O₂ ranged within 9.18–15.29 mmol/g and 0–7.35 mmol/g, which, at a 1:4:1 g/cm³/cm³ ratio, were equal to 225–375 g/dm³ H₂SO₄ and 0–250 g/dm³ H₂O₂, respectively. Various oxidants such as H₂O₂, MnO₂, air, oxygen, and Fe³⁺ ions were tested in the leaching experiments. The optimal leaching conditions were proven to be a temperature of 70 °C, duration of 180 min, S/L ratio of 0.2 g/cm³, and consumption rate of 13.4 mmol H₂SO₄/g. These leaching conditions led to the recovery of 96.1% Fe, 87.0% Cu, and 86.9% Zn with the addition of 2.94 mmol H₂O₂/g and 95.2% Fe, 84.7% Cu, and 67.5% Zn with the addition of 0.095 g MnO₂/g. These results suggest that metallic iron particles contained in a CBWS sample complicate copper dissolution.
@article{d499e6ce-895b-4daf-ac02-55b6d9afe23d,
title={Recycling Potential of Copper-Bearing Waelz Slag via Oxidative Sulfuric Acid Leaching},
author={Pavel Grudinsky and Ekaterina Vasileva},
year={2025},
language={en}
}TY - JOUR TI - Recycling Potential of Copper-Bearing Waelz Slag via Oxidative Sulfuric Acid Leaching AU - Pavel Grudinsky AU - Ekaterina Vasileva PY - 2025 LA - en ER -
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