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首页> 外文期刊>Hydrometallurgy >Tank bioleaching of low-grade chalcopyrite concentrates using redox control
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Tank bioleaching of low-grade chalcopyrite concentrates using redox control

机译：使用氧化还原控制对低品位黄铜矿精矿进行罐式生物浸出

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Bioleaching tests were carried out in bench-scale piloting facilities, comprising fully controlled multi-stage continuously operated reactor systems using moderate thermophile and thermophile consortia under both uncontrolled and controlled redox potential conditions to assess the effect of temperature and redox control on chalcopyrite leach kinetics. The bench-scale studies demonstrated that copper recoveries N95% could be achieved without redox control, using a thermophilic culture at 70 ℃. Acceptable copper extractions could not be achieved under similar conditions at 45 ℃. A significant increase in the copper leach kinetics and copper extractions was, however, achieved by controlling the redox potential in the 45 ℃ system at 420 mV. Final copper extractions increased from 64% at high redox potential to 97% under controlled redox conditions and as a result of the improvement in the Cu leach performance there is potential to reduce the overall residence time of the process. A key advantage of the process is that the bioleaching process costs are minimized, since the pyrite was not oxidized.
机译：生物浸出试验是在试验规模的试验设施中进行的，该试验设施包括在不受控和受控氧化还原电位条件下使用中等嗜热菌和嗜热菌团的完全受控的多级连续操作反应器系统，以评估温度和氧化还原控制对黄铜矿浸出动力学的影响。实验室规模的研究表明，使用70℃的嗜热培养，无需氧化还原控制即可达到N95％的铜回收率。在相似的条件下（45℃）无法达到可接受的铜萃取率。但是，通过将45℃系统中的氧化还原电势控制在420 mV，可以显着提高铜的浸出动力学和铜的萃取率。最终的铜提取率从高氧化还原电势下的64％增加到受控氧化还原条件下的97％，并且由于铜浸出性能的提高，有可能减少该工艺的总停留时间。该方法的主要优点是，由于黄铁矿没有被氧化，生物浸出过程的成本得以最小化。

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