Abstract Synergetic effect of pyrite on strengthening bornite bioleaching has been confirmed in our former work. However, the effect of pyrite with different semiconducting properties on bornite bioleaching has not been investigated yet. In order to fill this important knowledge gap, hall effect tests, electrochemical tests, X-ray diffraction (XRD) tests and X-ray photoelectron spectroscopy (XPS) tests combined with bioleaching experiments were performed to investigate the effect of pyrite with different semiconducting properties on the bioleaching of mixed ore (pyrite and bornite mixed at mass ratio of 3:1). It was found that the copper extraction of mixed ore containing the n-type pyrite was 10% higher than that of the p-type pyrite in sulfuric media. The difference however could be narrowed and eliminated in the presence of Leptospirillum ferriphilum (L. ferriphilum), and the leaching rate of copper could eventually both reach 85%. Results of XRD and XPS of leached residues confirmed that pyrite with different semiconducting properties could not change the dissolution mechanism of bornite, and a large amount of jarosite and elemental sulfur formed at the latter stage of bioleaching may be responsible for bornite passivation. The result of electrochemical measurements further proved the conclusion drew from XRD tests and indicated that n-type pyrite had better performance on increasing corrosion kinetics of bornite than p-type pyrite.

中文翻译：

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嗜铁钩端螺旋体存在下不同半导体性质的黄铁矿对斑铜矿生物浸出的影响

摘要 黄铁矿对加强斑铜矿生物浸出的协同作用已在我们以前的工作中得到证实。然而，尚未研究具有不同半导体特性的黄铁矿对斑铜矿生物浸出的影响。为了填补这一重要的知识空白，进行了霍尔效应测试、电化学测试、X 射线衍射 (XRD) 测试和 X 射线光电子能谱 (XPS) 测试与生物浸出实验相结合，以研究具有不同半导体性能的黄铁矿的影响。对混合矿石（黄铁矿和斑铜矿按质量比 3:1 混合）的生物浸出。结果表明，在硫酸介质中，含n型黄铁矿的混合矿石的铜提取率比p型黄铁矿的铜提取率高10%。然而，在嗜铁钩端螺旋体（L. ferriphilum）的存在下，这种差异可以缩小和消除，铜的浸出率最终都可以达到85%。浸出残渣的XRD和XPS结果证实，不同半导体性质的黄铁矿不会改变斑铜矿的溶解机制，生物浸出后期形成的大量黄钾铁矾和元素硫可能是斑铜矿钝化的原因。电化学测量的结果进一步证明了XRD测试的结论，表明n型黄铁矿在增加斑铜矿腐蚀动力学方面比p型黄铁矿具有更好的性能。浸出残渣的XRD和XPS结果证实，不同半导体性质的黄铁矿不会改变斑铜矿的溶解机制，生物浸出后期形成的大量黄钾铁矾和元素硫可能是斑铜矿钝化的原因。电化学测量的结果进一步证明了XRD测试的结论，表明n型黄铁矿在增加斑铜矿腐蚀动力学方面比p型黄铁矿具有更好的性能。浸出残渣的XRD和XPS结果证实，不同半导体性质的黄铁矿不会改变斑铜矿的溶解机制，生物浸出后期形成的大量黄钾铁矾和元素硫可能是斑铜矿钝化的原因。电化学测量的结果进一步证明了XRD测试的结论，表明n型黄铁矿在增加斑铜矿腐蚀动力学方面比p型黄铁矿具有更好的性能。