Hong Fen-Fen, He Huan, Liu Jin-Yan, Tao Xiu-Xiang, Zheng Lei, Zhao Yi-Dong
Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
ScientificWorldJournal. 2013 Oct 27;2013:184964. doi: 10.1155/2013/184964. eCollection 2013.
Acidithiobacillus ferrooxidans (A. ferrooxidans) was applied in coal biodesulfurization and coal's pyrite bioleaching. The result showed that A. ferrooxidans had significantly promoted the biodesulfurization of coal and bioleaching of coal's pyrite. After 16 days of processing, the total sulfur removal rate of coal was 50.6%, and among them the removal of pyritic sulfur was up to 69.9%. On the contrary, after 12 days of processing, the coal's pyrite bioleaching rate was 72.0%. SEM micrographs showed that the major pyrite forms in coal were massive and veinlets. It seems that the bacteria took priority to remove the massive pyrite. The sulfur relative contents analysis from XANES showed that the elemental sulfur (28.32%) and jarosite (18.99%) were accumulated in the biotreated residual coal. However, XRD and XANES spectra of residual pyrite indicated that the sulfur components were mainly composed of pyrite (49.34%) and elemental sulfur (50.72%) but no other sulfur contents were detected. Based on the present results, we speculated that the pyrite forms in coal might affect sulfur biooxidation process.
氧化亚铁硫杆菌（A. ferrooxidans）被应用于煤炭生物脱硫和煤中黄铁矿的生物浸出。结果表明，氧化亚铁硫杆菌显著促进了煤炭的生物脱硫和煤中黄铁矿的生物浸出。处理16天后，煤炭的总脱硫率为50.6%，其中黄铁矿硫的去除率高达69.9%。相反，处理12天后，煤中黄铁矿的生物浸出率为72.0%。扫描电子显微镜图像显示，煤中主要的黄铁矿形态为块状和细脉状。似乎细菌优先去除块状黄铁矿。X射线吸收近边结构（XANES）的硫相对含量分析表明，元素硫（28.32%）和黄钾铁矾（18.99%）在生物处理后的残余煤中积累。然而，残余黄铁矿的X射线衍射（XRD）和XANES光谱表明，硫成分主要由黄铁矿（49.34%）和元素硫（50.72%）组成，未检测到其他硫含量。基于目前的结果，我们推测煤中黄铁矿的形态可能会影响硫的生物氧化过程。
