Abstract The impacts of operational parameters on the morphological structure and uranium bioleaching performance of the bio-ore pellets obtained in one-step bioleaching by Aspergillus niger were investigated. The uranium recovery of over 80% was achieved under the optimized conditions. Furthermore, the morphological changes of ore particles before and after bioleaching were characterized by scanning electron microscope. The results showed more reactive surfaces were generated by the wrap and adherence of mycelia and the corrosion of metabolites. Finally, the three-dimensional structures of bio-ore pellets were detected by X-ray full-field nano-computed tomography. The results showed the bio-ore pellet structures could be classified into one type of bilayer structure and two types of three-layer structures. The bio-ore pellets with bilayer structure that the mycelia and ore particles were evenly distributed presented preferable uranium bioleaching capability.

中文翻译：

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操作参数对黑曲霉一步法生物矿球团矿形态结构和铀生物浸出性能的影响

摘要 研究了操作参数对黑曲霉一步法生物浸出的生物矿球团形态结构和铀生物浸出性能的影响。在优化条件下，铀回收率达到80%以上。此外，通过扫描电子显微镜表征了生物浸出前后矿石颗粒的形态变化。结果表明，菌丝体的包裹和粘附以及代谢物的腐蚀产生了更多的反应性表面。最后，通过X射线全场纳米计算机断层扫描检测了生物矿球团的三维结构。结果表明，生物矿球团结构可分为一种双层结构和两种三层结构。