4.7 Article

Bioleaching of cobalt from magnetite-rich cobaltite-bearing ore

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HYDROMETALLURGY
卷 204, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.hydromet.2021.105727

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Bioleaching; Acidophiles; Cobaltite; Co dissolution; Cobalt

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This study investigated the bioleaching of cobaltite-bearing magnetite-rich ore using mesophilic and moderately thermophilic cultures at different pulp densities. The results showed that mesophiles were more effective than moderate thermophiles in bioleaching cobaltite. Additional Fe3+ in the leach solution increased cobalt dissolution. Kinetic modeling indicated that the controlling step of bioleaching with moderate thermophiles was the chemical reaction.
Cobaltite (CoAsS) is a strategically important mineral. This work investigated the bioleaching of cobaltite-bearing magnetite-rich ore. The bioleaching of cobaltite was carried out with mixed mesophilic and moderately thermophilic cultures at 4, 8, and 12% pulp densities in shake flasks. The bioleaching with mesophiles at 8% pulp dissolved up to 89% of the cobalt content, higher than the bioleaching of 4% pulp and abiotic control test. Additional Fe3+ in the leach solution increased cobalt dissolution in the control test. The bioleaching by moderate thermophiles reached 97% cobalt dissolution in 16 d contact time. Kinetic modeling indicated that the controlling step of bioleaching with moderate thermophiles was the chemical reaction, while the diffusion was the rate-limiting factor for the bioleaching with mesophiles.

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