空白焙烧石煤物相及钒形态变化对细菌浸钒的影响

金属矿山 ›› 2018, Vol. 47 ›› Issue (03): 85-89.

空白焙烧石煤物相及钒形态变化对细菌浸钒的影响

王鑫^1,2，林海^2,3，董颖博^2,3，李甘雨^1,2

1.北京科技大学土木与资源工程学院，北京 100083；2.工业典型污染物资源化处理北京市重点实验室，北京100083；3.北京科技大学能源与环境工程学院，北京 100083

出版日期:2018-03-15 发布日期:2018-03-20
基金资助:
基金项目：国家水体污染控制与治理科技重大专项项目（编号：2015ZX07205003）。

Effects of the Change of Mineral Phase and Vanadium Speciation on Bioleaching Vanadium from Stone Coal

Wang Xin^1,2，Lin Hai^2,3，Dong Yingbo^2,3，Li Ganyu^1,2

1.School of Civil and Resources Engineering,University of Science and Technology Beijing,100083,China；2.Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants,100083,China；3.School of Energy and Environmental Engineering,University of Science and Technology Beijing,100083,China

Online:2018-03-15 Published:2018-03-20

摘要/Abstract

摘要： 以湖北郧西某石煤为原料，研究了石煤空白焙烧对石煤物相、钒形态及微生物浸出过程的影响，并采用XRF、XRD和FTIR等检测手段对石煤原矿及焙烧熟料进行了表征。结果表明：①石煤试样在900 ℃空白焙烧预处理2 h，在细菌作用下，钒浸出率达到92.62%，浸出体系中Si的最大浸出量为53.93 mg/L，浸出结束后，体系中Al的最大浸出量小于10 mg/L，Fe的最大浸出量小于2 mg/L。②石煤中88.62%的钒存在于残渣态中，900 ℃空白焙烧熟料中，存在于残渣态中的钒仅占9.28%，可交换态中的钒增至85.52%。③空白焙烧使钒云母的层间水分子发生了变化，羟基脱除，铝氧四面体的结构失稳，基本构成单元发生畸变和垮塌，晶格中钒与周围元素的化学键能降低，削弱了对钒的束缚，为细菌浸出钒创造了条件。

关键词: 含钒石煤, 空白焙烧, 胶质芽孢杆菌, 微生物浸出, BCR连续提取

Abstract: The stone coal from Yunxi，Hubei was selected as raw materials.The influence of additive-free roasting technique on the mineral phase，vanadium speciation and bioleaching vanadium process was investigated.The detection methods of X-ray fluorescence (XRF),X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) were used to analyze the ore stone coal and the roasted residue.The results showed that ①the vanadium leaching rate could reach 92.62% and the highest concentration of Si was 53.93 mg/L，when the sample was roasted at 900 ℃ for 2 h.After leaching，the maximum of Al and Fe in the system was less than 10 mg/L and 2 mg/L，respectively.②The V was chiefly present in the residual fraction in the stone coal，which account for 88.62%.The content of V increased to 85.52% in the extractable fraction and it is only 9.28% in the residual fraction after additive-free roasting in 900 ℃.③the additive-free roasting caused the changes of the hydrogen bonding of interlayer water in muscovite and the disappearance of OH; the unstable of structure of alumina tetrahedron; the distorted and collapsed of basic composition unit; the reduced of chemical bond energies of the vanadium and around elements，which weaken the bond of vanadium.It provided favorable conditions for bioleaching process.

Key words: Vanadium-bearing stone coal, Additive-free roasting, Bacillus mucilaginosus, Bioleaching, BCR-sequential extraction

王鑫, 林海, 董颖博, 李甘雨. 空白焙烧石煤物相及钒形态变化对细菌浸钒的影响[J]. 金属矿山, 2018, 47(03): 85-89.

WANG Xin, LIN Hai, DONG Ying-Bo, LI Gan-Yu. Effects of the Change of Mineral Phase and Vanadium Speciation on Bioleaching Vanadium from Stone Coal[J]. Metal Mine, 2018, 47(03): 85-89.

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