Bioleaching mechanism of Co and Li from spent lithium-ion battery by the mixed culture of acidophilic sulfur-oxidizing and iron-oxidizing bacteria
Bioleaching mechanism of Co and Li from spent lithium-ion battery by the mixed culture of acidophilic sulfur-oxidizing and iron-oxidizing bacteria
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DOI：
10.1016/j.biortech.2009.06.086
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发表时间：
2009-12-01
影响因子：
11.4
通讯作者：
Li, Li
中科院分区：
文献类型：
--
作者：
Xin, Baoping;Zhang, Di;Li, Li
研究了硫氧化菌和铁氧化菌混合培养对废旧锂离子电池中钴和锂的生物浸出机制。研究发现，以单质硫为能源时，在最低pH值1.54下锂的释放量最高，以FeS₂为能源时在最高pH值1.69下锂的释放量最低。相比之下，以S + FeS₂为能源时，在较高pH值和不同氧化还原电位下钴的释放量最高，以S为能源时在几乎不变的氧化还原电位下钴的释放量最低。研究表明，酸溶解是锂生物浸出的主要机制，与能源物质类型无关，然而，除酸溶解外，Fe²⁺催化还原也参与生物浸出过程。在FeS₂和FeS₂ + S体系中，不溶性的Co³⁺被Fe²⁺还原为可溶性的Co²⁺后，通过酸溶解释放出Co²⁺。通过生物过程刺激化学浸出实验以及利用XPS、SEM和EDX对生物浸出残渣的结构和成分变化进行表征所获得的进一步结果，证实了上述提出的生物浸出机制。（C）2009爱思唯尔有限公司。保留所有权利。
The bioleaching mechanism of Co and Li from spent lithium-ion batteries by mixed culture of sulfur-oxidizing and iron-oxidizing bacteria was investigated. It was found that the highest release of Li occurred at the lowest pH of 1.54 with elemental sulfur as an energy source, the lowest occurred at the highest pH of 1.69 with FeS2. In contrast, the highest release of Co occurred at higher pH and varied ORP with S + FeS2, the lowest occurred at almost unchanged ORP with S. It is suggested that acid dissolution is the main mechanism for Li bioleaching independent of energy matters types, however, apart from acid dissolution, Fe2+ catalyzed reduction takes part in the bioleaching process as well. Co2+ was released by acid dissolution after insoluble Co3+ was reduced into soluble Co2+ by Fe2+ in both FeS2 and FeS2 + S systems. The proposed bioleaching mechanism mentioned above was confirmed by the further results obtained from the experiments of bioprocess-stimulated chemical leaching and from the changes in structure and component of bioleaching residues characterized by XPS, SEM and EDX. (C) 2009 Elsevier Ltd. All rights reserved.