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- W2888408075 abstract "Atmospheric acid leaching (AL) is one of the cost-effective hydrometallurgical processing routes for copper (Cu) recovery from low grade ores. Significant technical and processing challenges, however, persist in implementation of AL for Cu recovery from chalcopyrite due to its refractory nature and hence, slow leach kinetics. This paper investigates the atmospheric acid leaching of a chalcopyrite ore for enhanced Cu recovery using polyethylenimine (PEI) as organic extractant. Batch, isothermal leaching tests were conducted over 4 h, to investigate the effect of temperature (25 - 95 degreesC), oxidant type (ferric chloride vs. ferric sulphate) and concentration (0.005 M - 0.1 M Fe3+), pH (1 and 3), oxidation reduction potential (ORP) and the addition of PEI on chalcopyrite leaching behaviour. The results showed a significant role of temperature with enhanced Cu leaching at higher temperatures. For leaching tests conducted at pH 1 and in the absence of PEI, maintaining ORP at > 400 mV was essential to prevent plateauing of Cu leaching with ferric chloride being a better oxidant than ferric sulphate. For leaching tests conducted at pH 3, despite generally lower Cu recovery compared with pH 1, PEI addition into leach media noticeably enhanced the Cu leaching rate. Furthermore, in the presence of PEI, Cu leaching did not slow down or plateau at ORP< 400 mV. The findings of this study are promising in terms of improving the AL of low grade chalcopyrite ores." @default.
- W2888408075 created "2018-08-31" @default.
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- W2888408075 date "2016-01-01" @default.
- W2888408075 modified "2023-09-23" @default.
- W2888408075 title "Atmospheric leaching of chalcopyrite using polyethyleneimine as an organic extractant: Effect of process conditions" @default.
- W2888408075 hasPublicationYear "2016" @default.
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