The recovery of vanadium(V)from stone coal by bioleaching is a promising method.The bioleaching experiments and the biosorption experiments were carried out,aiming to explore the adsorption characteristics of Bacillus...The recovery of vanadium(V)from stone coal by bioleaching is a promising method.The bioleaching experiments and the biosorption experiments were carried out,aiming to explore the adsorption characteristics of Bacillus mucilaginosus(B.mucilaginosus)on the surface of vanadium-bearing stone coal,and the related mechanisms have been investigated.After bioleaching at 30℃ for 28 d,the cumulative leaching rate of V reached 60.2%.The biosorption of B.mucilaginosus on stone coal was affected by many factors.When the pH value of leaching system is 5.0,strong electrostatic attraction between bacteria and stone coal promoted biosorption.Bacteria in the logarithmic growth phase had mature and excellent biosorption properties.The initial bacterial concentration of 3.5×10^(8) CFU/mL was conducive to adhesion,with 38.9%adsorption rate and 3.6×10^(7) CFU/g adsorption quantity.The adsorption of B.mucilaginosus on the stone coal conformed to the Freundlich model and the pseudo-second-order kinetic model.Bacterial surface carried functional groups(-CH_(2),-CH_(3),-NH_(2),etc.),which were highly correlated with the adsorption behavior.In addition,biosorption changed the surface properties of stone coal,resulting in the isoelectric point(IEP)approaching the bacteria.The results could provide an effective reference for the adsorption laws of bacteria on minerals.展开更多
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 th...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.展开更多
对某石煤矿的提钒工艺研究结果表明,该石煤矿的最佳提钒工艺路线为预脱碳活化—浓酸熟化—水浸法提钒,但矿区中石煤矿的最高发热值仅为3 450 k J/kg,不能满足脱碳焙烧设备对燃料发热值的最低要求(燃料热值≥4 200 k J/kg)。本研究根据...对某石煤矿的提钒工艺研究结果表明,该石煤矿的最佳提钒工艺路线为预脱碳活化—浓酸熟化—水浸法提钒,但矿区中石煤矿的最高发热值仅为3 450 k J/kg,不能满足脱碳焙烧设备对燃料发热值的最低要求(燃料热值≥4 200 k J/kg)。本研究根据矿山中钒资源主要分布于两个区域,且一个矿区钒资源储量少(占资源量的25.5%),矿石含钒含碳均较低,另一个区域钒资源储量高(占资源量的74.0%),矿石含钒含碳均较高的实际情况,对含钒含碳均较低的矿石进行选矿处理,得到了V2O5含量为1.69%,热值为5 920 k J/kg的碳精矿,将其作为高热值燃料与含钒含碳较高的矿石配制成热值≥4 200 k J/kg的混合料后作为提钒原料,顺利解决了脱碳焙烧设备对燃料热值的要求。展开更多
基金supported by the National Natural Science Foundation of China(No.51874018)。
文摘The recovery of vanadium(V)from stone coal by bioleaching is a promising method.The bioleaching experiments and the biosorption experiments were carried out,aiming to explore the adsorption characteristics of Bacillus mucilaginosus(B.mucilaginosus)on the surface of vanadium-bearing stone coal,and the related mechanisms have been investigated.After bioleaching at 30℃ for 28 d,the cumulative leaching rate of V reached 60.2%.The biosorption of B.mucilaginosus on stone coal was affected by many factors.When the pH value of leaching system is 5.0,strong electrostatic attraction between bacteria and stone coal promoted biosorption.Bacteria in the logarithmic growth phase had mature and excellent biosorption properties.The initial bacterial concentration of 3.5×10^(8) CFU/mL was conducive to adhesion,with 38.9%adsorption rate and 3.6×10^(7) CFU/g adsorption quantity.The adsorption of B.mucilaginosus on the stone coal conformed to the Freundlich model and the pseudo-second-order kinetic model.Bacterial surface carried functional groups(-CH_(2),-CH_(3),-NH_(2),etc.),which were highly correlated with the adsorption behavior.In addition,biosorption changed the surface properties of stone coal,resulting in the isoelectric point(IEP)approaching the bacteria.The results could provide an effective reference for the adsorption laws of bacteria on minerals.
基金financially supported by the Major Science and Technology Program for Water Pollution Control and Treatment of China (No. 2015ZX07205003)
文摘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.
文摘对某石煤矿的提钒工艺研究结果表明,该石煤矿的最佳提钒工艺路线为预脱碳活化—浓酸熟化—水浸法提钒,但矿区中石煤矿的最高发热值仅为3 450 k J/kg,不能满足脱碳焙烧设备对燃料发热值的最低要求(燃料热值≥4 200 k J/kg)。本研究根据矿山中钒资源主要分布于两个区域,且一个矿区钒资源储量少(占资源量的25.5%),矿石含钒含碳均较低,另一个区域钒资源储量高(占资源量的74.0%),矿石含钒含碳均较高的实际情况,对含钒含碳均较低的矿石进行选矿处理,得到了V2O5含量为1.69%,热值为5 920 k J/kg的碳精矿,将其作为高热值燃料与含钒含碳较高的矿石配制成热值≥4 200 k J/kg的混合料后作为提钒原料,顺利解决了脱碳焙烧设备对燃料热值的要求。
