Electrochemical studies on dissolution and passivation behavior of low temperature bioleaching of chalcopyrite by Acidithiobacillus ferrivorans YL15
Electrochemical studies on dissolution and passivation behavior of low temperature bioleaching of chalcopyrite by Acidithiobacillus ferrivorans YL15
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Acidithiobacillus ferrivorans YL15低温生物浸出黄铜矿的溶解和钝化行为的电化学研究
DOI：
10.1016/j.mineng.2020.106416
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发表时间：
2020-08
影响因子：
4.8
通讯作者：
Li Shen
中科院分区：
文献类型：
--
作者：
Weimin Zeng;Yuping Peng;Tangjian Peng;Meihua Nan;Miao Chen;Guanzhou Qiu;Li Shen
摘要中高温条件下的细菌浸出已被广泛应用于硫化矿中金属的回收，但低温条件下的细菌浸出研究还很少。应用循环伏安法（CV）、动电位极化曲线和电化学阻抗谱（EIS）等电化学分析技术，结合扫描电子显微镜（SEM）等表面检测方法，研究黄铜矿在6°C生物浸出过程中的电化学行为。黄铜矿细菌浸出实验表明，最大细胞密度可达5.3×108个/mL。嗜酸嗜铁硫杆菌对铜的浸出率可达1.92g/L，优于无菌试验的0.67g/L。循环伏安测试发现，随着浸出时间的延长，阳极和阴极电流信号逐渐减弱，阳极峰逐渐由低电位向高电位移动。动电位极化曲线上腐蚀电位的升高和腐蚀电流的降低证明黄铜矿表面发生了钝化。交流阻抗测试结果表明，离子交换电阻从306.1Ω增加到1913.0Ω，大于矿物表面元素硫和多硫化物形成的钝化膜阻抗。这表明低温下黄铜矿电极的阻抗主要是离子交换阻抗而不是钝化层，这与常温或高温下的生物浸出不同。
Abstract Bioleaching has been widely applied to recover metals from sulfide minerals at medium or high temperatures, however, little is known about the bioleaching at low temperature. Electrochemical analysis techniques such as cyclic voltammetry (CV), potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS), combined with surface detection methods such as scanning electron microscopy (SEM), applied to study the electrochemical behavior of chalcopyrite during bioleaching at 6°C. Chalcopyrite bioleaching experiments demonstrated that the maximum cell density could achieve 5.3×108 cells/mL. Copper extraction by Acidithiobacillus ferrivorans could reach 1.92g/L, which is better than the 0.67g/L of sterile experiment. CV tests found that as the leaching time passed, the anodic and cathodic current signals decreased and the anodic peak moved gradually from low potential to high potential. The increase of corrosion potential and the decrease of corrosion current in potentiodynamic polarization proved the passivation on the surface of the chalcopyrite. EIS results showed that ion exchange resistance increased from 306.1Ω to 1913.0Ω, which is larger than the passivation film impedance originated from elemental sulfur and polysulfide on the mineral surface. It suggested that the impedance of chalcopyrite electrode at low temperature is mainly due to ion exchange impedance but not passivation layer, which is different from the bioleaching at normal or high temperature.
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影响因子：
4.7
作者：
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通讯作者：
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通讯作者：
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影响因子：
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