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采用原子吸收光谱(AAS)、扫描电子显微镜/X射线能谱仪(SEM/EDS)、傅里叶红外光谱(FTIR)、X射线衍射物相分析(XRD)等手段研究了黑曲霉菌对蛇纹石尾矿的生物浸出效果,并对浸矿机理进行了探讨。结果发现,黑曲霉菌对尾矿的浸出当培养基的pH=6,加入蔗糖的量为10%时,浸矿效果最好;将浸矿前后的矿粉进行SEM/EDS发现:浸矿过程中,菌体与矿粉相互作用形成了菌体-矿物复合体;红外光谱表明:黑曲霉菌表面有结合金属的官能团,如羟基、羧基、氨基等,浸出矿粉后,1645cm-1处的峰红移到1631cm-1,说明细胞上的多糖、蛋白质酰胺等参与了浸矿过程,但主要峰位未发生变化,说明细菌的主要成分和结构保持完整;XRD图谱发现:原尾矿与黑曲霉菌Asp-1#作用后,部分尾矿中的镁被浸出生成了新物质—有机酸镁。
AAS, SEM / EDS, FTIR and XRD were used to study the effects of Aspergillus niger on snake The bioleaching effect of the kesterite tailing and the mechanism of the ore leaching were discussed. The results showed that aspergillus niger leaching tailings when the pH of the medium 6, the amount of sucrose added was 10%, the best leaching results; the mineral leaching before and after mining SEM / EDS found: leaching process The interaction between bacteria and mineral powder formed the cell-mineral complex. The infrared spectrum showed that the surface of Aspergillus niger had metal-binding functional groups such as hydroxyl, carboxyl and amino groups. Peak red shift to 1631cm-1, indicating cell polysaccharides, protein amide involved in the leaching process, but the main peak did not change, indicating that the main components of bacteria and structure remain intact; XRD patterns found: the original tailings and black song Aspergillus Asp-1 # role, part of the tailings of magnesium is leached to generate a new material - magnesium organic acid.