| 中度嗜热菌浸出黄铁矿过程中矿物表面硫的化学形态 |
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| 引用本文： | 何环, 杨益, 夏金兰, 陶秀祥, 赵屹东. 中度嗜热菌浸出黄铁矿过程中矿物表面硫的化学形态[J]. 工程科学学报, 2011, 33(11): 1319-1324. DOI: 10.13374/j.issn1001-053x.2011.11.008 |
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| 作者姓名： | 何环 杨益 夏金兰 陶秀祥 赵屹东 |
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| 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%.
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| 关 键 词： | 黄铁矿 生物浸出 中度嗜热菌 硫形态 |
| 收稿时间： | 2011-02-28 |
Sulfur speciation on the surface of pyrite leached by moderate thermophiles |
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| HE Huan, YANG Yi, XIA Jin-lan, TAO Xiu-xiang, ZHAO Yi-dong. Sulfur speciation on the surface of pyrite leached by moderate thermophiles[J]. Chinese Journal of Engineering, 2011, 33(11): 1319-1324. DOI: 10.13374/j.issn1001-053x.2011.11.008 |
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| Authors: | HE Huan YANG Yi XIA Jin-lan TAO Xiu-xiang ZHAO Yi-dong |
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| Abstract: | 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. |
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| Keywords: | pyrite bioleaching moderate thermophiles sulfur speciation |
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