Pyrite Surface after Thiobacillus ferrooxidans Leaching at 30°C
Pyrite Surface after Thiobacillus ferrooxidans Leaching at 30°C
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DOI：
10.1111/j.1755-6724.2006.tb00262.x
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发表时间：
2006-06
期刊：
影响因子：
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通讯作者：
Lou Jianjun;Lu Xiancai;Wang Rucheng;Li Juan;Zhu Changjian;Gao Jianfeng
中科院分区：
文献类型：
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作者：
Lou Jianjun;Lu Xiancai;Wang Rucheng;Li Juan;Zhu Changjian;Gao Jianfeng
为了研究氧化亚铁硫杆菌对黄铁矿氧化的影响，设计并进行了两个平行实验，分别采用硫酸溶液和接种氧化亚铁硫杆菌的酸性溶液，在30℃下，通过滴加浓硫酸将两种溶液的初始pH调节到2.5。用扫描电子显微镜(SEM)观察了黄铁矿在浸出液中浸泡前、浸泡后的硫酸溶液和接种氧化亚铁硫杆菌的酸性溶液中的表面。在生物浸出的黄铁矿表面，氧化亚铁硫杆菌有多种侵蚀模式。由此得出结论，黄铁矿的氧化可能是由表面侵蚀引起的。细菌附着在黄铁矿表面导致侵蚀坑，导致黄铁矿氧化。在黄铁矿的氧化过程中，直接机理可能起着最重要的作用。两种实验溶液的铁离子浓度随时间的变化表明，氧化亚铁硫杆菌对黄铁矿的氧化有较大的促进作用。
Abstract In order to investigate the effect of Thiobacillus ferrooxidans on the oxidation of pyrite, two parallel experiments, which employed H2SO4 solutions and acidic solutions inoculated with Thiobacillus ferrooxidans, were designed and carried out at 30°C. The initial pH of the two solutions was adjusted to 2.5 by dropwise addition of concentrated sulphuric acid. The surfaces of pyrite before exposure to leaching solutions and after exposure to the H2SO4 solutions and acidic solutions inoculated with Thiobacillus ferrooxidans were observed by scanning electron microscopy (SEM). There were a variety of erosion patterns by Thiobacillus ferrooxidans on the bio‐leached pyrite surfaces. A conclusion can be drawn that the oxidation of pyrite might have been caused by erosion of the surfaces. Attachment of the bacteria to pyrite surfaces resulted in erosion pits, leading to the oxidation of pyrite. It is possible that the direct mechanism plays the most important role in the oxidation of pyrite. The changes in iron ion concentrations of both the experimental solutions with time suggest that Thiobacillus ferrooxidans can enhance greatly the oxidation of pyrite.