Faculty of Science, Pavol Jozef Safarik University in Kosice, Srobarova 2, 04154, Kosice, Slovakia.
Faculty of Material, Metallurgy and Recycling, Technical University of Kosice, Letna 9, 04200, Kosice, Slovakia.
Sci Rep. 2020 Sep 3;10(1):14594. doi: 10.1038/s41598-020-71596-5.
Three different biological systems, the consortium of autotrophic bacteria Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, heterotrophic fungus Aspergillus niger and heterotrophic yeast Rhodotorula mucilaginosa, were investigated for lithium extraction from lepidolite. The bacterial consortium was the most effective, 11 mg l of Li was dissolved in the absence of nutrients within 336 days. Fungal and yeast bioleaching was faster (40 days), however, with lower extraction efficiency. Bioaccumulation represented a main process of Li extraction by R. mucilaginosa and A. niger, with 92 and 77% of total extracted Li accumulated in the biomass, respectively. The X-ray diffraction analysis for bioleaching residue indicated changes caused by microorganisms, however, with differences between bacterial leaching and bioleaching by fungi or yeasts. The final bioleaching yields for bacterial consortium, A. niger and R. mucilaginosa were 8.8%, 0.2% and 1.1%, respectively. Two-step bioleaching using heterotrophic organisms followed by autotrophic bioleaching could lead to the increase of the process kinetics and efficiency. Bioaccumulation of Li offers strong advantage in Li extraction from solution.
研究了三种不同的生物系统，即自养细菌嗜酸氧化亚铁硫杆菌和嗜酸硫杆菌的共生体、异养真菌黑曲霉和异养酵母粘红酵母，以从锂云母中提取锂。细菌共生体的效果最显著，在没有营养物质的情况下，11mg/L 的 Li 在 336 天内被溶解。真菌和酵母的生物浸出速度更快（40 天），但提取效率较低。生物累积是粘红酵母和黑曲霉提取 Li 的主要过程，分别有 92%和 77%的总提取 Li 累积在生物量中。生物浸出残渣的 X 射线衍射分析表明，微生物引起了变化，但细菌浸出和真菌或酵母生物浸出之间存在差异。细菌共生体、黑曲霉和粘红酵母的最终生物浸出率分别为 8.8%、0.2%和 1.1%。使用异养生物进行两步生物浸出，然后进行自养生物浸出，可以提高过程动力学和效率。Li 的生物累积在从溶液中提取 Li 方面具有很大的优势。
