Abstract The catalytic mechanism of activated carbon-assisted bioleaching of enargite concentrate (enargite 37.4%; pyrite 47.3%) was investigated by employing microbiological, electrochemical and kinetic studies. By using moderately thermophilic microorganisms at 45 °C, the final Cu dissolution was improved from 36% to 53% at 0.2% (w/v) activated carbon. An excess activated carbon addition showed an adverse effect. The enargite mineral itself favored higher solution redox potential (Eh) for solubilization. However, the dissolution of co-existing pyrite, which also favors high Eh, immediately hindered enargite dissolution through the passivation effect. The surface of activated carbon functioned as an electron mediator to couple RISCs oxidation and Fe3+ reduction, so that elevation of the Eh level was controlled by offsetting microbial Fe3+ regeneration. As long as the Eh level was suppressed at

中文翻译：

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活性炭辅助精矿生物浸出的催化机理

摘要 通过微生物学、电化学和动力学研究，研究了活性炭辅助生物浸出精矿（精矿37.4%；黄铁矿47.3%）的催化机理。通过在 45 °C 下使用中等嗜热微生物，最终的铜溶解在 0.2% (w/v) 活性炭下从 36% 提高到 53%。过量的活性炭添加显示出不利影响。enargite 矿物本身有利于溶解更高的溶液氧化还原电位 (Eh)。然而，共存的黄铁矿的溶解也有利于高 Eh，通过钝化作用立即阻碍了磷灰石的溶解。活性炭表面作为电子介体将 RISCs 氧化和 Fe3+ 还原结合起来，从而通过抵消微生物 Fe3+ 再生来控制 Eh 水平的升高。只要 Eh 水平被抑制在