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Article

Effect of Ultrasound on the Oxidative Copper Leaching from Chalcopyrite in Acidic Ferric Sulfate Media

Hydrometallurgy and Environmental Group, Robert M. Buchan Department of Mining, Queen’s University, 25 Union Street, Kingston, ON K7L 3N6, Canada
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Minerals 2020, 10(7), 633; https://doi.org/10.3390/min10070633
Received: 10 June 2020 / Revised: 13 July 2020 / Accepted: 15 July 2020 / Published: 17 July 2020
(This article belongs to the Section Mineral Processing and Extractive Metallurgy)
The objective of this study is to compare the reaction kinetics of copper leaching from chalcopyrite in acidic ferric sulfate media with (UAL) and without (non-UAL) ultrasound assistance. Four leaching parameters were evaluated and optimized. The parameter with the strongest effect was temperature, followed by ultrasonic power, the solid-to-liquid ratio (S/L), and acid concentration. Copper recovery showed an increase with rising temperatures in both systems. Ultrasonic power had a positive effect on copper leaching, but no significant difference was found among various power amplitudes. Copper extraction increased with decreasing S/L. At 0.1% S/L, the UAL leaching rate was double the non-UAL leaching rate. In both systems, acid concentration had little effect on copper extraction. Under optimized conditions, 20% amplitude power, 1% S/L, 0.5 M acid, and 80 °C leaching temperature, copper extraction was 50.4% and 57.5% in the non-UAL and UAL treatments, respectively. Ultrasonic waves enhanced the leaching rate, shortened the reaction time, and reduced acid consumption. Analysis of the rate-controlling step using a shrinking core model showed that leaching occurs after diffusion through the product layer but also chemical controlled in both non-UAL and UAL systems. The leaching mechanism was confirmed by characterizing the chalcopyrite and leached residue with X-ray diffraction and scanning electron microscopy/energy dispersive X-ray spectroscopy. View Full-Text
Keywords: ultrasound; chalcopyrite; copper; sulfuric acid; leaching kinetics ultrasound; chalcopyrite; copper; sulfuric acid; leaching kinetics
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MDPI and ACS Style

Wang, J.; Faraji, F.; Ghahreman, A. Effect of Ultrasound on the Oxidative Copper Leaching from Chalcopyrite in Acidic Ferric Sulfate Media. Minerals 2020, 10, 633. https://doi.org/10.3390/min10070633

AMA Style

Wang J, Faraji F, Ghahreman A. Effect of Ultrasound on the Oxidative Copper Leaching from Chalcopyrite in Acidic Ferric Sulfate Media. Minerals. 2020; 10(7):633. https://doi.org/10.3390/min10070633

Chicago/Turabian Style

Wang, Jingxiu, Fariborz Faraji, and Ahmad Ghahreman. 2020. "Effect of Ultrasound on the Oxidative Copper Leaching from Chalcopyrite in Acidic Ferric Sulfate Media" Minerals 10, no. 7: 633. https://doi.org/10.3390/min10070633

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