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首页> 外文会议>International biohydrometallurgy symposium >Characterization of apparent sulfur oxidation activity of thermophiles in bioleaching of chalcopyrite
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Characterization of apparent sulfur oxidation activity of thermophiles in bioleaching of chalcopyrite

机译：黄铜矿生物浸出中嗜热菌表观硫氧化活性的表征

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摘要

Bio-oxidation of elemental sulfur using acidophilic sulfur oxidizing microbe, is a complex process. The sulfur oxidation activity of sulfur-oxidizing microbe is an important parameter for bio-oxidation. At present, the sulfur oxidation activity of sulfuroxidizing microbe is characterized indirectly by the evolutions of the cells concentration, pH and sulfate ions concentration in solution. In this article, the sulfur oxidation activities of four pure thermophilic archea Acidianus brierleyi (JCM 8954) , Metallosphaera sedula (YN 23) , Acidianus manzaensis ( YN 25) and Sulfolobus metallicus ( YN 24) and their mixture in bioleaching chalcopyrite were compared. The results showed that the mixed culture, contributed significantly to the raising of leaching rate which suggests that mixed culture had a higher sulfur oxidation activity than that of the pure culture. Meanwhile, the results also indicated that the changes of parameters characterizing the sulfur oxidation activity of thermophiles were often affected by many factors, so it is hard to reflect accurately the specific sulfur oxidation activities among the different sulfur-oxidizing microbes when bioleaching chalcopyrite in different conditions. Accordingly, an efficient method to characterize bacterial sulfur oxidation activity appears to be desirable.
机译：使用嗜酸性硫氧化微生物对元素硫进行生物氧化是一个复杂的过程。硫氧化微生物的硫氧化活性是生物氧化的重要参数。目前，硫氧化微生物的硫氧化活性间接通过溶液中细胞浓度，pH和硫酸根离子浓度的变化来表征。在本文中，比较了四种纯嗜热古细菌Acidianus brierleyi（JCM 8954），景天金属丝菌（YN 23），曼氏酸丝虫（YN 25）和金属硫磺菌（YN 24）的硫氧化活性，以及​​它们在生物浸出黄铜矿中的混合物。结果表明，混合培养对浸出率的提高有显着贡献，这表明混合培养具有比纯培养更高的硫氧化活性。同时，结果还表明，表征嗜热菌的硫氧化活性的参数变化通常受多种因素影响，因此在不同条件下生物浸出黄铜矿时，难以准确反映出不同硫氧化微生物之间特定的硫氧化活性。 。因此，似乎需要一种表征细菌硫氧化活性的有效方法。

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