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首页> 外文会议>International Biohydrometallurgy Symposium >Electrochemical behavior of massive bornite bioleached electrodes in the presence of Acidithiobacillus ferrooxidans and Acidithiobacillus caldus
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Electrochemical behavior of massive bornite bioleached electrodes in the presence of Acidithiobacillus ferrooxidans and Acidithiobacillus caldus

机译：酸酐铁氧化物和酸酐酸胆碱存在下大型配铁岩生物浸润电极的电化学行为

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摘要

In this work, the monitoring of bacterial and chemical dissolution of massive bornite was performed using cyclic voltammetry (CV);;the mineral surface was examined using scanning electron microscopy (SEM) and the elements were indentified by Energy Dispersive X-ray Analysis (EDXA). The electrolyte employed for the electrochemical tests was the medium used for bioleaching the electrodes (3.0 g.dm~(-3) (NH_4)_2.SO_4, 0.5 g.dm~(-3)K_2HPO_4, 0.5 g.dm~(-3) MgSO_4.7H_2O and 0.1 g.dm~(-3) Ca(NO_3)_2). The results showed differences in voltagramms carried out by Acidithiobacillus ferrooxidans and Acidithiobacillus caldus: In bio leached electrodes tested in the presence of Acidithiobacillus ferrooxidans, the anodic and cathodic current signals were larger than with Acidithiobacillus caldus The analysis of CV results allowed attributing the different peaks observed in both the direct and reverse potential scanning to the oxidation of bornite to a secondary copper mineral(chalcocite and covellite) and its reduction via different non stoichiometric copper sulphides intermediaries. Surface evidences were produced by SEM, and chemical elements evidences were also investigated by EDAX.
机译：在这项工作中，使用循环伏安法（CV）进行细菌和化学溶解的监测;使用扫描电子显微镜（SEM）检查矿物表面，通过能量分散X射线分析（EDXA）识别元件）。用于电化学试验的电解质是用于生物浸射电极的培养基（3.0g，3.0gm〜（-3）（NH_4）_2.SO_4，0.5g，0.5g，0.5 g.dm〜（ - ） - 3）MgSO_4.7H_2O和0.1 G.DM〜（-3）CA（NO_3）_2）。结果表明，酸酐铁氧化物和酸酐和酸酐的恒定差异：在存在于酸酐铁氧氧化物存在下测试的生物浸出电极中，阳极和阴极电流信号大于酸酐毒蕈碱的分析允许观察到不同峰的CV结果分析在直接和逆向电位扫描到二级铜矿物（Chalcocite和Covellite）的氧化和通过不同的非化学计量硫化铜中间体的减少。表面证据是通过SEM制作的，并且还通过edax调查了化学元素证据。

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