Electrochemical Study on the Bioleaching of Marmatite

Abstract:

Shaking-flask experiments and electrochemical tests were conducted to study the bioleaching of marmatite with mixed cultures of mesophilic bacteria. The effects of copper ions and the surfactant, o-phenylenediamines (OPD) on the bioleaching were investigated. The electrochemical mechanism of the bioleaching was researched through cyclic voltammetry and chronoamperometry. The results show that the decrease in leaching rate was associated with a passive film (elemental sulfur) formed on the surface of marmatite in the leaching course. It was found that, however, the passive film dissolved readily under high potential conditions or with the bacterial action. Especially, in the presence of bacteria, the decomposition of the passive film was accelerated by adding either copper ions or OPD, leading to a significant increase in the bioleaching rate of marmatite.

• Periodical: Advanced Materials Research (Volumes 774-776)
• Pages: 512-518
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.774-776.512
• Online since: September 2013
• Authors: Zhuo Yue Lan, Di Fei Li, Qi Fu Zhang
• Keywords: Bacteria, Bioleaching, Electrochemical, Marmatite, Zinc

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