Metall. Res. Technol.
Volume 114, Number 4, 2017
|Number of page(s)||5|
|Published online||16 June 2017|
Effects of Acidithiobacillus ferrooxidans and Fe(III) on pyrite–pyrolusite bioleaching process
School of Civil and Resource Engineering, University of Science and Technology Beijing,
2 State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
⁎ e-mail: email@example.com
Received in final form: 5 October 2016
Accepted: 16 March 2017
The beneficial effects of Acidithiobacillus ferrooxidans and/or Fe(III) on manganese bioleaching from a low-grade manganese ore were confirmed. The results showed that the rate of manganese bioleaching increases with the amount of A. ferrooxidans and/or Fe(III). With the presence of Fe(III) and A. ferrooxidans the average initial leaching rate increased from 0.06 to 0.15 g/(L h). Cyclic voltammetry analysis showed that the presence of A. ferrooxidans and/or Fe(III) generate obvious redox potential polarization in the solution. Fe(III) reduced the potential difference between anode and cathode of pyrite and promoted the positive cathodic polarization of pyrolusite at 0.2 V. In the process of pyrite oxidation A. ferrooxidans accelerated the generation and transfer of electron.
Key words: A. ferrooxidans / bioleaching / low-grade pyrolusite / pyrite / cyclic voltammetry
© EDP Sciences, 2017
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