Selective enhancement of Mn bioleaching from ferromanganese ores in presence of electron shuttles using dissimilatory Mn reducing consortia

The present study describes anoxic Mn bioleaching of low grade ferromanganese ores using a dissimilatory Mn reducing consortia (MRC). Effect of external addition of electron shuttles such as humic acid and anthraquinone sulphonic acid was studied under same conditions. The MRC were found to be capab...

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Bibliographic Details
Published in:Hydrometallurgy 2019-06, Vol.186, p.269-274
Main Authors: Aishvarya, V., Barman, S., Pradhan, N., Ghosh, M.K.
Format: Article
Language:English
Subjects:
Anoxic bioleaching
Biohydrometallurgy
Dissimilatory Mn reducers
Electron shuttles
Ferromanganese ores
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Summary:The present study describes anoxic Mn bioleaching of low grade ferromanganese ores using a dissimilatory Mn reducing consortia (MRC). Effect of external addition of electron shuttles such as humic acid and anthraquinone sulphonic acid was studied under same conditions. The MRC were found to be capable of utilizing MnO2 as electron acceptor as evidenced by Mn dissolution in media. In the presence of electron shuttles, Mn extraction was found to be enhanced by 2 to 4 times compared to the case without. A maximum of 58 (±3%) Mn was found to be leached from an amorphous ore while 38 (±2%) Mn was leached from a crystalline ore, in 50 days in presence of 100 μM electron shuttle at 20 g/L S:L ratio. A significant finding was consistently low leaching of Fe under all conditions studied (
ISSN:0304-386X
1879-1158
DOI:10.1016/j.hydromet.2019.04.029