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Copper extraction from oxide ore of Almalyk mine by H2SO4 in simulated heap leaching : effect of particle size and acid concentration

Chan-Ung Kang, Seung-Eun Ji, Thomas Pabst, Kung-Won Choi, Moonis Ali Khan, Rahul Kumar, Prakash Krishnaiah, Yosep Han, Byong-Hun Jeon and Do-Hyeon Kim

Article (2021)

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Abstract

In this investigation, a laboratory-scale study to extract copper (Cu) from its oxide ore (0.425–11.2 mm particle size) was conducted using varied sulfuric acid (H2SO4) concentrations (0.05–0.5 M) as a lixiviant. Through a physicochemical and mineralogical analysis of real field ore samples from the Almalyk mine heap site (Tashkent, Uzbekistan), malachite was identified as a Cu-bearing mineral. Extraction rates were analyzed according to the ore particle size and acid concentration. The Cu extraction with the smallest particle size (in 24 h) varied between 76.7% and 94.26% at varied H2SO4 concentrations (0.05–0.5 M). Almost half (50%) of Cu was extracted from the ore within 4 and 72 h of contact time for 0.425–2 mm and 5.6–11.2 mm particle sizes, respectively, using 0.15 M H2SO4. Weeklong leaching experiments with 0.5 M H2SO4 revealed a higher copper extraction rate (≥73%) from coarse ore particles (5.6–11.2 mm). Along with the copper extraction, iron (29.6 wt%), aluminum (70.2 wt%), magnesium (85.4 wt%), and calcium (44.4 wt%) were also leached out considerably through the dissolution of silicate and carbonate gangue minerals. In this study, an 80.0–94.26% copper extraction rate with reduced acid consumption (20%) proved to be a cost-effective approach.

Uncontrolled Keywords

heap leaching; copper extraction; copper oxide; malachite; acid consumption

Subjects: 1400 Mining and mineral processing > 1400 Mining and mineral processing
1400 Mining and mineral processing > 1402 Mineral processing
Department: Department of Civil, Geological and Mining Engineering
Funders: Korea Institute of Energy Technology Evaluation and Planning (KETEP), Korea Environmental Industry & Technology Institute (KEITI), King Saud University (Riyadh, Saudi Arabia) - Researchers Supporting Project
Grant number: 20182510102420, 2020002480007, RSP-2021/345
PolyPublie URL: https://publications.polymtl.ca/9416/
Journal Title: Minerals (vol. 11, no. 9)
Publisher: MDPI
DOI: 10.3390/min11091020
Official URL: https://doi.org/10.3390/min11091020
Date Deposited: 16 Aug 2023 13:58
Last Modified: 10 Apr 2024 03:25
Cite in APA 7: Kang, C.-U., Ji, S.-E., Pabst, T., Choi, K.-W., Khan, M. A., Kumar, R., Krishnaiah, P., Han, Y., Jeon, B.-H., & Kim, D.-H. (2021). Copper extraction from oxide ore of Almalyk mine by H2SO4 in simulated heap leaching : effect of particle size and acid concentration. Minerals, 11(9), 14 pages. https://doi.org/10.3390/min11091020

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