Bioleaching of vanadium from barren stone coal and its effect on the transition of vanadium speciation and mineral phase

Xin Wang; Hai Lin; Ying-bo Dong; Gan-yu Li

doi:10.1007/s12613-018-1568-9

Volume 25 Issue 3

Mar. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(3): 253-261

Xin Wang, Hai Lin, Ying-bo Dong, and Gan-yu Li, Bioleaching of vanadium from barren stone coal and its effect on the transition of vanadium speciation and mineral phase, Int. J. Miner. Metall. Mater., 25(2018), No. 3, pp. 253-261. https://doi.org/10.1007/s12613-018-1568-9

Cite this article as:

Xin Wang, Hai Lin, Ying-bo Dong, and Gan-yu Li, Bioleaching of vanadium from barren stone coal and its effect on the transition of vanadium speciation and mineral phase, Int. J. Miner. Metall. Mater., 25(2018), No. 3, pp. 253-261. https://doi.org/10.1007/s12613-018-1568-9

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Research Article

Bioleaching of vanadium from barren stone coal and its effect on the transition of vanadium speciation and mineral phase

+ Author Affiliations

Corresponding author:
Hai Lin E-mail: E-mail: linhai@ces.ustb.edu.cn
Received: 30 June 2017; Revised: 28 October 2017; Accepted: 30 October 2017

Abstract

Abstract

This study determined the optimal conditions required to obtain maximum vanadium extraction and examined the transition of mineral phases and vanadium speciation during the bioleaching process. Parameters including the initial pH value, initial Fe²⁺ concentration, solid load, and inoculum quantity were examined. The results revealed that 48.92wt% of the vanadium was extracted through bioleaching under optimal conditions. Comparatively, the chemical leaching yield (H₂SO₄, pH 2.0) showed a slower and milder increase in vanadium yield. The vanadium bioleaching yield was 35.11wt% greater than the chemical leaching yield. The Community Bureau of Reference (BCR) sequential extraction results revealed that 88.62wt% of vanadium existed in the residual fraction. The bacteria substantially changed the distribution of the vanadium speciation during the leaching process, and the residual fraction decreased to 48.44wt%. The X-ray diffraction (XRD) and Fourier transform infrared (FTIR) results provided evidence that the crystal lattice structure of muscovite was destroyed by the bacteria.
- bioleaching;
- stone coal;
- BCR-sequential extraction;
- vanadium speciation;
- mineral phase

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