| 嗜酸氧化亚铁硫杆菌（ATCC 23270）浸出黄铜矿过程中的EPS、Cu2+和Fe3+的相互作用机制（英文） |
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| 引用本文： | 余润兰,刘晶,陈安,钟代立,李乾,覃文庆,邱冠周,顾帼华.嗜酸氧化亚铁硫杆菌（ATCC 23270）浸出黄铜矿过程中的EPS、Cu2+和Fe3+的相互作用机制（英文）[J].中国有色金属学会会刊,2013,23(1):231-236. |
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| 作者姓名： | 余润兰 刘晶 陈安 钟代立 李乾 覃文庆 邱冠周 顾帼华 |
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| 作者单位： | 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 |
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| 基金项目： | Project(50621063) supported by the National Natural Science Foundation of China;Project(2010CB630903) supported by the National Basic Research Program of China |
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| 摘 要： | 采用超声-离心方法提取嗜酸氧化亚铁硫杆菌(ATCC 23270)胞外多聚物(EPS)、EPS中的Cu2+、Fe3+离子,研究生物浸出黄铜矿过程中Cu2+、Fe3+和EPS的相互作用机制。结果表明:与Fe3+离子相比,Cu2+离子可刺激细菌产生更多的EPS;当Cu2+离子浓度从0.01mol/L增加到0.04mol/L时,EPS中Fe3+/Cu2+质量比从4:1降低到2:1;从1%黄铜矿的无铁9K介质中提取的EPS中铜铁含量是从含0.04mol/LCu2+离子的9K介质中提取的量的2倍。在生物浸出黄铜矿过程中,黄铜矿表面结合黄铁钾钒的EPS层减弱了Cu2+、Fe3+离子的迁移,逐渐成为离子扩散壁垒。
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| 关 键 词： | 胞外多聚物 铁离子 铜离子 生物浸出 黄铜矿 |
| 收稿时间： | 7 December 2011 |
Interaction mechanism of Cu2+,Fe3+ ions and extracellular polymeric substances during bioleaching chalcopyrite by Acidithiobacillus ferrooxidans ATCC2370 |
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| Run-lan YU,Jing LIU,An CHEN,Dai-li ZHONG,Qi an LI,Wen-qing QIN,Guan-zhou QIU,Guo-hua GU.Interaction mechanism of Cu2+,Fe3+ ions and extracellular polymeric substances during bioleaching chalcopyrite by Acidithiobacillus ferrooxidans ATCC2370[J].Transactions of Nonferrous Metals Society of China,2013,23(1):231-236. |
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| Authors: | Run-lan YU Jing LIU An CHEN Dai-li ZHONG Qi an LI Wen-qing QIN Guan-zhou QIU Guo-hua GU |
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| Affiliation: | Key Laboratory of Biometallurgy,Ministry of Education,School of Minerals Processing and Bioengineering,Central South University,Ch angsha 410083,China |
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| Abstract: | The extracellular polymeric substances (EPS) of Acidithiobacillus ferrooxidans ATCC 23270, and iron and copper enclosed in EPS were extracted by ultrasonication and centrifugation methods to determine the interaction mechanism of Cu2+, Fe3+ and EPS during bioleaching chalcopyrite. Generally, Cu2+ ions can stimulate bacteria to produce more EPS than Fe3+ ions. The mass ratio of Fe3+/Cu2+ enclosed in EPS decreased gradually from about 4:1 to about 2:1 when the concentration of Cu2+ ions increased from 0.01 to 0.04 mol/L. The amount of iron and copper bound together by EPS in ferrous-free 9K medium containing 1% chalcopyrite was about 2 times of that in 9K medium containing 0.04 mol/L Cu2+ ions. It was inferred that the EPS with jarosites on the surface of chalcopyrite gradually acted as a weak diffusion barrier for Cu2+, Fe3+ ions transference during bioleaching chalcopyrite. |
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