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Electrochemical processing of ocean manganese nodules with microbial enhancement to recover valuable metals

Kumari, A and Natarajan, KA (2002) Electrochemical processing of ocean manganese nodules with microbial enhancement to recover valuable metals. In: Minerals and Metallurgical Processing, 19 (3). pp. 137-147.

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Official URL: http://cat.inist.fr/?aModele=afficheN&cpsidt=14712...

Abstract

In this paper, electroleaching and electrobioleaching of ocean manganese nodules are discussed along with the role of galvanic interactions in bioleaching. Polarization studies using a manganese nodule slurry electrode system indicated that the maximum dissolution of iron and manganese due to electrochemical reduction occurred at negative DC potentials of -600 and -1,400 mV(SCE). Electroleaching and electrobioleaching of ocean manganese nodules in the presence of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans at the above negative applied DC potentials resulted insignificant dissolution of copper, nickel and cobalt in 1 M H2SO4 and in sulfuric acid solution at pH 0.5 and 2.0. Mechanisms involved in electrobioleaching of ocean manganese nodules are discussed. Galvanic leaching of ocean manganese nodules in the presence of externally added pyrite and pyrolusite for enhancement of dissolution was also studied. Various electrochemical and biochemical parameters were optimized, and the electroleaching and galvanic processes thus developed are shown to yield almost complete dissolution of all metal values. This electrobioleaching process developed in the laboratory may be cost effective, energy efficient and environmentally friendly.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Society for Mining, Metallurgy & Exploration.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 20 Jul 2011 06:32
Last Modified: 20 Jul 2011 06:32
URI: http://eprints.iisc.ernet.in/id/eprint/39167

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