Spent Li-ion batteries (LIBs) are highly rich in cobalt and lithium that need to be recovered to reduce shortages of these valuable metals and decrease their potential environmental risks. This study applied bioleaching using Aspergillus niger strains MM1 and SG1 and Acidithiobacillus thiooxidans 80191 for removal of Co and Li from spent LIB under type 1 and type 2 conditions. Moreover, metal recovery was attempted from the fungal leaching solution by sodium sulfide, sodium hydroxide, and sodium oxalate for Co and then for Li using sodium carbonate. The findings of this work show that metal removal in fungal bioleaching under type 2 system was highly comparable or even better than bacterial or acid leaching. A significant quantity of Co (82%) and Li (100%) dissolution was observed in strain MM1; however, metal solubilization was poor in strain 80191 because only 22% Co and 66% Li solubilized. A high amount of Co precipitated potentially as cobalt sulfide (100%), cobalt hydroxide (100%), or cobalt oxalate (88%), whereas Li precipitated as lithium carbonate (73.6%). Finally, results of this study suggest that fungal bioleaching could be an environmentally friendly approach for solubilization and recovery of considerable quantities of metals from spent LIBs.

中文翻译：

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从废锂离子电池中回收钴和锂的生物浸出和化学沉淀方法

废锂离子电池（LIB）富含钴和锂，需要回收这些锂和锂以减少这些有价金属的短缺并降低其潜在的环境风险。这项研究应用了黑曲霉菌株MM1和SG1和酸性硫代氧化硫杆菌的生物浸出80191用于在1型和2型条件下从废LIB中去除Co和Li。此外，尝试通过硫化钠，氢氧化钠和草酸钠从真菌浸出液中回收金属，以回收钴，然后回收碳酸钠，以碳酸钠的形式。这项工作的发现表明，在2型系统下真菌生物浸出中的金属去除具有很高的可比性，甚至比细菌或酸浸更好。在菌株MM1中观察到大量的Co（82％）和Li（100％）溶解；但是，由于只有22％的Co和66％的Li溶解，金属溶解度在80191菌株中很差。大量的Co可能以硫化钴（100％），氢氧化钴（100％）或草酸钴（88％）的形式析出，而Li以碳酸锂的形式（73.6％）析出。最后，