Issue |
Metall. Res. Technol.
Volume 114, Number 4, 2017
|
|
---|---|---|
Article Number | 402 | |
Number of page(s) | 5 | |
DOI | https://doi.org/10.1051/metal/2017022 | |
Published online | 16 June 2017 |
Regular Article
Effects of Acidithiobacillus ferrooxidans and Fe(III) on pyrite–pyrolusite bioleaching process
1
School of Civil and Resource Engineering, University of Science and Technology Beijing,
Beijing
100083, China
2
State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences,
Beijing
100190, China
⁎ e-mail: hrli@home.ipe.ac.cn
Received:
22
June
2016
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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