中度嗜热菌浸出黄铁矿过程中矿物表面硫的化学形态  

Sulfur speciation on the surface of pyrite leached by moderate thermophiles

作　　者：何环[1] 杨益[2] 夏金兰[2] 陶秀祥[1] 赵屹东[3] 

机构地区：[1]中国矿业大学化工学院煤炭加工与洁净利用教育部重点实验室,徐州221116 [2]中南大学资源加工与生物工程学院生物冶金教育部重点实验室,长沙410083 [3]中国科学院高能物理研究所国家同步辐射实验室,北京100049

出　　处：《北京科技大学学报》2011年第11期1319-1324,共6页Journal of University of Science and Technology Beijing

基　　金：中央高校基本科研业务费专项资金资助项目(2010QNA15);中国博士后基金资助项目(20100481182);国家自然科学基金资助项目(50974140)

摘　　要：利用扫描电镜(SEM)、X射线衍射(XRD)和硫的K边X射线吸收近边结构光谱(XANES)等分析手段研究了中度嗜热菌(Sulfobacillus thermosulfidooxidans)浸出黄铁矿过程及矿物表面硫的化学形态.结果表明:中度嗜热菌明显促进了黄铁矿的溶出,24 d浸出液中总铁的质量浓度达到5.3 g.L-1.经24 d细菌处理后,矿物表面形貌变化明显,出现良好结晶状态的晶体.浸出过程中累积在黄铁矿表面的主要成分是黄钾铁矾.矿物表面硫的形态组分主要为黄铁矿和黄钾铁矾,其质量分数分别为34.8%和65.2%.Leaching processes and sulfur speciation on the surface of pyrite leached by the moderate thermophiles of Sulfobacillus thermosulfidooxidans were investigated by scanning electron microscopy,X-ray diffraction and sulfur K-edge X-ray absorption near edge structure spectroscopy.The results show that Sulfobacillus thermosulfidooxidans can significantly improve the leaching of pyrite and the leaching rate is up to 5.3 g·L-1 after the process for 24 d.The surface of the mineral is obviously corrupted after leaching for 24 d with microbes and on the surface there are some visible crystalline floccules.Leaching products were found accumulating during the leaching process and the main composition is jarosite.The sulfur K-edge spectra indicates that the sulfur components are composed by pyrite and jarosite,whose mass fractions are 34.8% and 65.2%,respectively.

关 键 词：黄铁矿 生物浸出 中度嗜热菌 硫形态 

分 类 号：TF925.5[冶金工程]