Relatedness between catalytic effect of activated carbon and passivation phenomenon during chalcopyrite bioleaching by mixed thermophilic Archaea culture at 65 ℃
混合嗜热古菌在65 ℃生物浸出黄铜矿过程中活性炭的催化作用和钝化现象的相关性
查看参考文献27篇
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文摘
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The relatedness between catalytic effect of activated carbon and passivation phenomenon during chalcopyrite bioleaching by mixed thermophilic Archaea culture (Acidianus brierleyi, Metallosphaera sedula, Acidianus manzaensis and Sulfolobus metallicus) at 65 ℃ was studied. Leaching experiments showed that the addition of activated carbon could significantly promote the dissolution of chalcopyrite for both bioleaching and chemical leaching. The results of synchrotron-based X-ray diffraction, iron L-edge and sulfur K-edge X-ray absorption near edge structure spectroscopy indicated that activated carbon could change the transition path of electrons through galvanic interactions to form more readily dissolved secondary mineral chalcocite at a low redox potential (-400 mV) and then enhanced the copper dissolution. Jarosite accumulated immediately in the initial stage of bioleaching with activated carbon but copper dissolution was not hindered. However, much jarosite precipitated on the surface of chalcopyrite in the late stage of bioleaching, which might account for the decrease of copper dissolution rate. More elemental sulfur (S~0) was also detected with additional activated carbon but the mixed thermophilic Archaea culture had a great sulfur oxidation activity, thus S~0 was eliminated and seemed to have no significant influence on the dissolution of chalcopyrite. |
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其他语种文摘
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研究活性炭对四株典型嗜热古菌混合培养物(Acidianus brierleyi, Metallosphaera sedula, Acidianus manzaensis和Sulfolobus metallicus)在65 ℃时浸出纯黄铜矿过程中活性炭的催化作用和钝化现象的相关性。浸出实验表明,活性炭能够有效地促进黄铜矿的生物浸出和化学浸出。基于同步辐射技术的X射线衍射、铁的L-边和硫的K-边X射线吸收近边结构光谱学分析表明,在生物浸出过程中当氧化还原电位较低(<400 mV)时,活性炭能通过原电池反应改变电子传递途径,生成更易溶解的次生矿物辉铜矿,从而增强黄铜矿的浸出。在添加活性炭的生物浸出过程的前期,黄钾铁矾迅速累积但铜离子的浸出速率未受到抑制,然而在生物浸出的后期,大量黄钾铁矾沉淀在矿物表面,从而抑制黄铜矿的进一步溶解。在添加活性炭时检测到了更多的单质硫,但由于嗜热古菌混合培养物具有很强的硫氧化活性,所以生成的单质硫被其消解,因此,未检测到其对黄铜矿浸出有显著影响。 |
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来源
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Transactions of Nonferrous Metals Society of China
,2017,27(6):1374-1384 【核心库】
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DOI
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10.1016/S1003-6326(17)60158-4
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关键词
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chalcopyrite
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bioleaching
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activated carbon
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passivation phenomenon
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mixed thermophilic Archaea culture
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地址
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1.
School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083
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School of Minerals Processing and Bioengineering, Central South University, Key Laboratory of Biometallurgy, Ministry of Education, Changsha, 410083
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Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049
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Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1003-6326 |
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学科
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冶金工业 |
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基金
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国家自然科学基金
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supported by the Joint Funds of National Natural Science Foundation of China and Large Scientific Facility Foundation of Chinese Academy of Sciences
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supported by the Beijing Synchrotron Radiation Facility Public User Program, China
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supported by the Shanghai Institute of Applied Physics Open Fund of Shanghai Synchrotron Radiation Facility, China
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文献收藏号
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CSCD:6030727
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