Biochemical Leaching of Metals from Indian Ocean Nodules

Das, Chitrangada and Mehta, K D and Pandey, B D (2005) Biochemical Leaching of Metals from Indian Ocean Nodules. In: International Seminar on Mineral Processing Technology - (MPT-2005), January 6-8, 2005, Indian School of Mines, Dhanbad.



Bioleaching of valuable metals from Indian Ocean poly-metallic nodules was carried out using a pure culture of Aspergillus niger. Parameters such as pH, pulp density (PD), particle size, time were optimised for the bio-recovery of metals. At pH 4.5, 35 °C temperature and 5% PD and in 30 days the biorecovery of the metals was found to be 97% Cu, 98% Ni, 86% Co, 91% Mn and 32% Fe whereas in control experiment 4.9% Cu, 8.2% Ni, 27% Co, 6.3% Mn and 7.1% Fe were dissolved. The interesting aspect of this investigation is that a good amount of leached metals are adsorbed on fungal mycelia which can be recovered by acid wash. Fall in pH rom 7 to 4.6 and rise in Eh from 140 mV to 380 mV indicated that A.niger followed indirect leach-ing mechanism by releasing some organic acids which in turn converted higher oxides to lower oxide phases as identified by XRD phase analyses.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Biochemical leaching; Indian Ocean Nodules; Mineral resources; chemical dissolution
Divisions:Mineral Processing
ID Code:6138
Deposited By:Sahu A K
Deposited On:23 Oct 2012 11:36
Last Modified:23 Oct 2012 11:36
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