Chalcopyrite, the primary copper ore, is difficult to treat by bioleaching. Although chloride ions and relatively high temperatures can catalyze this process, they can also significantly inhibit microbial metabolism. In this work, galvanic bioleaching (GalBio) of chalcopyrite was investigated by separating the leaching and microbial regeneration of the oxidant into two chambers. Therefore, stricter leaching conditions were used in the negative chamber with 0–1.5 mol/L NaCl and 60–90 °C for chalcopyrite dissolution, while the biological metabolism of the positive chamber was maintained under optimal conditions. In addition, power recovery was assumed with an external resistance of 0.5–50 Ω during the GalBio process. Compared with the control groups, the GalBio system in the presence of NaCl improved Cu extraction by 58–70 %, with a leaching time of only 24 h. In addition, a stable current of ∼80 mA and a maximum electrical energy production of 113.6 kW h/t Cu leached were achieved. A combination of the solid characterization results (XRD, SEM and XPS) revealed that the GalBio system prevented the formation of jarosite, and the addition of NaCl resulted in the “passivation” film being loosely porous, effectively facilitating the access of reactants to unreacted chalcopyrite cores. The results obtained may provide new ideas for Cu extraction from chalcopyrite and help promote the green development of the industry through the recovery of electricity. However, improving the efficiency of electron transfer between the two electrodes in the anode and cathode chambers, and preventing intermediates and mineral particles from clogging the internal fluid flow channels of the device through more optimized structural design and material application, are potential issues to focus on as the GalBio process is scaled up and industrialized.

中文翻译：

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黄铜矿的电化学生物浸出，具有额外的功率回收

黄铜矿是原生铜矿石，很难通过生物浸出进行处理。虽然氯离子和相对较高的温度可以催化这一过程，但它们也可以显着抑制微生物代谢。在这项工作中，通过将氧化剂的浸出和微生物再生分离到两个腔室中，研究了黄铜矿的电偶生物浸出 （GalBio）。因此，在负室中使用更严格的浸出条件，NaCl 为 0–1.5 mol/L，黄铜矿溶解温度为 60–90 °C，而正室的生物代谢保持在最佳条件下。此外，假设在 GalBio 过程中使用 0.5-50 Ω的外部电阻进行功率恢复。与对照组相比，在 NaCl 存在下的 GalBio 系统将铜提取率提高了 58-70%，浸出时间仅为 24 小时。此外，还实现了 ∼80 mA 的稳定电流和 113.6 kW h/t Cu 浸出的最大电能。固体表征结果（XRD、SEM 和 XPS）的组合表明，GalBio 系统阻止了黄铁矿的形成，而 NaCl 的添加导致“钝化”膜疏通多孔，有效地促进了反应物进入未反应的黄铜矿核心。所得结果可能为黄铜矿提铜提供新思路，并通过电力回收促进行业绿色发展。 然而，随着 GalBio 工艺的放大和工业化，提高阳极和阴极室中两个电极之间的电子传输效率，并通过更优化的结构设计和材料应用来防止中间体和矿物颗粒堵塞器件的内部流体流道，这些都是需要关注的潜在问题。