Bioleaching of vanadium from barren stone coal and its effect on the transition of vanadium speciation and mineral phase
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第3期
论文作者：Xin Wang Hai Lin Ying-bo Dong Gan-yu Li
文章页码：253 - 261
摘 要：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 p H value, initial Fe2+ concentration, solid load, and inoculum quantity were examined. The results revealed that 48.92 wt% 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 35.11 wt% greater than the chemical leaching yield. The Community Bureau of Reference（BCR） sequential extraction results revealed that 88.62 wt% 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 48.44 wt%. 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.
Xin Wang1,2，Hai Lin3,2，Ying-bo Dong3,2，Gan-yu Li1,2
1. School of Civil and Resource Engineering, University of Science and Technology Beijing2. Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants3. School of Energy and Environmental Engineering, University of Science and Technology Beijing
摘 要：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 p H value, initial Fe2+ concentration, solid load, and inoculum quantity were examined. The results revealed that 48.92 wt% 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 35.11 wt% greater than the chemical leaching yield. The Community Bureau of Reference（BCR） sequential extraction results revealed that 88.62 wt% 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 48.44 wt%. 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.
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