Bioleaching of Indian Ocean nodules with in situ iron precipitation by anaerobic Mn reducing consortia

In the present study selective iron-free extraction of Cu, Ni, Co and Mn from Indian Ocean manganese nodules by manganese reducing consortium is described. The consortium isolated from manganese ore mines of Joda, Odisha (India) and enriched with Indian Ocean manganese nodules was used for bioleachi...

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Bibliographic Details
Published in:Hydrometallurgy 2016-12, Vol.166, p.130-135
Main Authors: Aishvarya, V., Mishra, G., Pradhan, N., Ghosh, M.K.
Format: Article
Language:English
Subjects:
Anaerobic bioleaching
Bacterial leaching
Consortia
Dissimilatory reducers
Dissolution
In situ leaching
In-situ iron precipitation
Indian Ocean
Iron
Manganese
Manganese nodule
Mn reducing bacteria
Nickel
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Summary:In the present study selective iron-free extraction of Cu, Ni, Co and Mn from Indian Ocean manganese nodules by manganese reducing consortium is described. The consortium isolated from manganese ore mines of Joda, Odisha (India) and enriched with Indian Ocean manganese nodules was used for bioleaching under facultative anaerobic conditions in mineral salt media using organic carbon source. Bioleaching was carried out at 30°C without agitation. Recoveries of Mn, Ni and Co increased with time, while maximum Cu recovery occurred during the initial period followed by a decrease. A notable finding was that Fe dissolution remained extremely low, i.e. less than 42mgL−1 (3.0%), possibly due to in situ precipitation of iron. X-ray diffraction patterns of bioleach residues indicated formation of FePO4 and MnCO3 phases. Iron dissolution remained consistently low even with increasing pulp density and decreasing particle size. The Mn reducing consortia may thus help in selective leaching of Mn while preventing Fe from contaminating the leach liquor, which is desirable in downstream processing of metal production from Mn-nodule and ferromanganese ores. [Display omitted] •Reduction of PMN under facultative anaerobic conditions by Mn reducing consortia.•Dissolution of metals through dissimilatory reduction of MnO2 and FeOOH by the consortia.•In-situ reoxidation of reduced iron by MnO2 and precipitation as FePO4.•Reduction by direct anaerobic respiration envisaged especially when using acetate as electron donor.
ISSN:0304-386X
1879-1158
DOI:10.1016/j.hydromet.2016.10.009