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

作     者：Xin Wang Hai Lin Ying-bo Dong Gan-yu Li 

作者机构：School of Civil and Resource Engineering University of Science and Technology Beijing Beijing 100083 China School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants Beijing 100083 China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2018年第25卷第3期

页      面：253-261页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 

基　　金：financially supported by the Major Science and Technology Program for Water Pollution Control and Treatment of China (No. 2015ZX07205003) 

主　　题：bioleaching stone coal BCR-sequential extraction vanadium speciation mineral phase 

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 Fe^(2+) 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(H_2SO_4, 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.