Copper extraction from oxide ore of almalyk mine by h2 so4 in simulated heap leaching: Effect of particle size and acid concentration
- Authors
- Kang, Chan-Ung; Ji, Seung-Eun; Pabst, Thomas; Choi, Kung-Won; Khan, Moonis Ali; Kumar, Rahul; Krishnaiah, Prakash; Han, Yosep; Jeon, Byong-Hun; Kim, Do-Hyeon
- Issue Date
- Sep-2021
- Publisher
- MDPI
- Keywords
- heap leaching; copper extraction; copper oxide; malachite; acid consumption
- Citation
- MINERALS, v.11, no.9, pp.1 - 14
- Indexed
- SCIE
SCOPUS
- Journal Title
- MINERALS
- Volume
- 11
- Number
- 9
- Start Page
- 1
- End Page
- 14
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/141034
- DOI
- 10.3390/min11091020
- ISSN
- 2075-163X
- 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 (H2 SO4 ) 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 H2 SO4 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 H2 SO4 . Weeklong leaching experiments with 0.5 M H2 SO4 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.
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