Bioleaching of a chalcopyrite concentrate using an extremely thermophilic culture
Bioleaching of a chalcopyrite concentrate using an extremely thermophilic culture
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DOI：
10.1016/s0301-7516(00)00056-9
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发表时间：
2001-05-01
影响因子：
--
通讯作者：
van Rooyen, JV
中科院分区：
文献类型：
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作者：
Gericke, M;Pinches, A;van Rooyen, JV
描述了极端嗜热者氧化由黄铜矿(66%)和黄铁矿(11%)组成的精矿的能力。在70摄氏度的批量试验表明，铜的萃取率为>；98%是可能的。在三级中试装置上进行了一系列连续试验。采用标准设计的机械搅拌和充气槽。考察了停留时间、进料粉碎度、氧气和二氧化碳的传质供给对生物滤池性能的影响。结果表明，铜的总浸出率可达95%。然而，与中温和中等嗜热细菌相比，极端嗜热菌似乎对所用固体浓度更敏感，这也可能与进料固体的颗粒大小有关。可以达到接近目前商业规模生物浸出罐处理难处理黄铁矿精矿的最高耗氧率的水平。为了保持这些高的氧化速率，重要的是确保向反应堆提供足够的氧气和二氧化碳的速率。在这些试验中获得的高铜萃取率表明，使用极端嗜热菌处理黄铜矿精矿的工艺具有进一步开发和评估商业应用的潜力。(C)2001 Elsevier Science B.V.保留所有权利。
The ability of an extreme thermophile to oxidise a concentrate comprising of chalcopyrite (66%) and pyrite (11%) is described. A batch test at 70 degreesC showed that a copper extraction of > 98% was possible. A series of continuous tests were carried out in a three-stage pilot plant. employing standard-design mechanically agitated and aerated tanks. The effect of residence time, feed grind and the mass transfer supply of oxygen and carbon dioxide on bioleach performance were evaluated. The results showed that overall Cu extractions of 95% could be obtained. However, compared to mesophilic and moderately thermophilic bioleaching bacteria, the extreme thermophiles appeared to be more sensitive to the solids concentration employed, which may also be related to the particle size of the feed solids. Levels of oxygen consumption approaching the maximum rates currently being employed in commercial-scale bioleach tanks treating refractory gold pyritic concentrates could be achieved. To maintain these high oxidation rates, it was important to ensure that the supply rate of oxygen and carbon dioxide to the reactors was sufficient. The high copper extractions obtained in these tests showed that a process treating chalcopyrite concentrates using extreme thermophiles has the potential for further development and assessment for commercial applications. (C) 2001 Elsevier Science B.V. All rights reserved.