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首页> 外文期刊>International Biodeterioration & Biodegradation >Silver-catalyzed bioleaching of copper, molybdenum from a chalcopyrite-molybdenite concentrate
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Silver-catalyzed bioleaching of copper, molybdenum from a chalcopyrite-molybdenite concentrate

机译：银从黄铜矿-辉钼矿精矿中催化铜，钼的生物浸出

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This study evaluated silver-catalyzed bioleaching to solubilize copper from a chalcopyrite-bearing molybdenite concentrate with mesophilic (32 degrees C) and moderately thermophilic (45 degrees C) microbial consortia. The Cu content of the concentrate was 0.98% (wt/wt), with chalcopyrite as the major Cu-bearing mineral. The molybdenite phase (53.8% Mo) also contained 0.055% rhenium. The addition of Ag+ as silver nitrate greatly enhanced copper dissolution under bioleaching conditions. Overall, >93% Cu was leached in the bioleaching experiments involving the addition of up to 200 mg l(-1) Ag, contrasted by 53% Cu solubilization in the absence of silver. The highest relative yields (>99%) were obtained under moderately thermophilic conditions. Different pulp densities (3-9%) and initial pH values (1.5-1.9) were also tested in the bioleaching experiments but their effects were masked by enhancement of copper leaching due to silver catalysis. Molybdenum and rhenium responded comparably to changes in bioleaching conditions, suggesting that Re was located in the molybdenite matrix. Their relative dissolution was 1% Mo and 6% Re, and only a minor enhancement of their dissolution was observed upon Ag addition. Compared with the bioleaching with mesophiles at 32 degrees C, the dissolution of Mo and Re was lower in the 45 degrees C experiments with moderate thermophiles. Because the corresponding yields of Cu dissolution increased with the temperature, this difference suggested early passivation of molybdenite, Mo precipitation, or a suppression of molybdenite oxidation capacity of the moderately thermophilic culture at the higher temperature. (c) 2015 Elsevier Ltd. All rights reserved.
机译：这项研究评估了银催化的生物浸出，以将铜矿从含黄铜矿的辉钼矿精矿与嗜温（32摄氏度）和中度嗜热（45摄氏度）微生物联合体溶解。精矿中的铜含量为0.98％（wt / wt），黄铜矿为主要的含铜矿物。辉钼矿相（53.8％Mo）也包含0.055％的rh。 Ag +作为硝酸银的添加大大提高了生物浸出条件下铜的溶解。总体而言，在涉及多达200 mg l（-1）Ag的生物浸出实验中，> 93％的Cu被浸出，而在不存在银的情况下，有53％的Cu溶解。在中等嗜热条件下可获得最高相对产率（> 99％）。在生物浸出实验中还测试了不同的纸浆密度（3-9％）和初始pH值（1.5-1.9），但是由于银催化作用，铜浸出的增强掩盖了它们的作用。钼和rh对生物浸出条件的变化具有类似的响应，表明Re位于钼矿基质中。它们的相对溶出度＜1％Mo和＜6％Re，并且在添加Ag时仅观察到它们溶出度的较小提高。与在32°C的嗜温菌进行生物浸出相比，在中等嗜热性的45°C实验中，Mo和Re的溶解度较低。由于相应的Cu溶解量随温度而增加，因此该差异表明辉钼矿的早期钝化，Mo沉淀或在较高温度下抑制了适度嗜热培养物的辉钼矿的氧化能力。 （c）2015 Elsevier Ltd.保留所有权利。

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