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Electrochemical Noise Analysis of Chalcopyrite Carbon Paste Electrodes by Acidithiobacillus ferrooxidans

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Abstract:

The electrochemical response of chalcopyrite was studied using electrochemical noise analysis (ENA). The assay was carried out under constant aeration using 30 mL in two electrochemical cells containing iron-free mineral salts solution. These cells were initially monitored for 56 hours. After 72 hours, 7.25×1010 cells mL-1 of A. ferrooxidans strain LR were added in both cells and monitored until 128 h. Subsequent to this period, 0.927 mmol L-1 of silver ions and 400 mmol L-1 of chloride ions were added each one separately. Both conditions were monitored until 168 hours. According to results obtained, it was observed that Cl- ions addition induced an accelerated corrosion process. However, there is a tendency of the system to reach the stationary state due to repassivation of the electrodic surface. In the other side, the Ag+ addition contributed for the maintenance of the oxidant atmosphere, in spite of controversial effect caused by considerable variations in the Rn values, resulting in a instability in the chalcopyrite reactivity.

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Periodical:

Advanced Materials Research (Volumes 20-21)

Pages:

83-86

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.20-21.83

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Online since:

July 2007

Authors:

Daniela G. Horta, Denise Bevilaqua, Heloísa A. Acciari, Oswaldo Garcia Jr., Assis Vicente Benedetti

Keywords:

Acidithiobacillus ferrooxidans, Bioleaching, Carbon Paste Electrode, Chalcopyrite, Electrochemical Noise Analysis

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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