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Leaching of copper, nickel and cobalt from Indian Ocean manganese nodules by Aspergillus niger by K.D. Mehta; Chitrangada Das; B.D. Pandey is a Engineering article available to read on EtoBox.

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The leaching of copper, nickel and cobalt from polymetallic manganese nodules from the Indian Ocean was investigated using a fungus -Aspergillus niger. Parameters such as initial pH, pulp density, particle size and duration of leaching were optimized for the bio-recovery of metals. At an initial pH of 4.5, 35 oC temperature and 5% (w/v) pulp density, about 97% Cu, 98% Ni, 86% Co, 91% Mn and 36% Fe were dissolved in 30 days time using adapted fungusas against only 4.9% Cu, 8.2% Ni, 27% Co, 6.3% Mn and 7.1% Fe solubilized in control experiment. The results indicate that A. niger released organic acids such as oxalic and citric acids which in turn reduced the host metal oxides/hydroxides to their lower valence states, and thus dissolving the base metals following the indirect mechanism. A comparison of results obtained with chemical leaching of sea nodules using citric and oxalic acids and bio-leaching using A. niger show that the leaching of metals was more effective in presence of the fungus. The appearance of some lower oxide phases of manganese and iron in the leach residue identified by XRD phase analyses may account for unlocking of the host lattice leading to release and dissol

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Author

K.D. Mehta; Chitrangada Das; B.D. Pandey

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-386X)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)