黑曲霉在拜耳法生产赤泥有价金属回收增强中的作用。
Role of Aspergillus niger in recovery enhancement of valuable metals from produced red mud in Bayer process.
机构信息
Biotechnology Group, Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran.
Biotechnology Group, Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran.
出版信息
Bioresour Technol. 2016 Oct;218:991-8. doi: 10.1016/j.biortech.2016.07.059. Epub 2016 Jul 15.
Annual worldwide growth rate of red mud (RM) as a hazardous waste has caused serious environmental problems for its disposal in the mining and metallurgy industries. Accordingly, the aim of this study was to investigate biological leaching of RM and recovery of metals using organic acids exerted by Aspergillus niger. Experiments using A. niger were conducted in batch cultures with a pulp density of 2% (w/v) RM under one-step, two-step and spent-medium bioleaching. Based on HPLC results, the major lixiviant was the secretion of organic acids (citric, gluconic, oxalic and malic) by A. niger. Leaching efficiency of metals in the one-step process was the highest and the amounts of leached metals were 69.8%, 60% and 25.4% for Al, Ti and Fe, respectively. The fungal leaching technique demonstrated an adequate recovery of metals, with an efficient and cost-effective means and respect to a reuse of RM for economic and environmental purposes.
赤泥（RM）作为一种危险废物，其年增长率在全球范围内不断上升，这给采矿和冶金行业的处理带来了严重的环境问题。因此，本研究旨在探讨黑曲霉（Aspergillus niger）施加的有机酸对 RM 的生物浸出和金属回收的作用。采用两步法和废培养液生物浸出法，在 2%（w/v）赤泥的纸浆密度下，用黑曲霉进行了分批培养实验。根据 HPLC 结果，主要的浸出剂是黑曲霉分泌的有机酸（柠檬酸、葡萄糖酸、草酸和苹果酸）。一步法工艺的金属浸出效率最高，分别为 69.8%、60%和 25.4%的 Al、Ti 和 Fe 被浸出。真菌浸出技术显示出对金属的充分回收，是一种高效、经济且符合 RM 经济和环境目的再利用的方法。
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