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The recycling of lithium cobaltate from waste lithium-ion batteries is of great significance for alleviating resource shortage and reducing environmental pollution. L-malic acid/ascorbic acid system was used as leaching agent to recover cobalt and lithium from waste lithium cobaltate batteries. The effects of L-malic acid concentration, ascorbic acid concentration, liquid volume to solid mass ratio, reaction temperature and time on the leaching rates of cobalt and lithium in lithium cobaltate were investigated. The leaching mechanism was discussed through kinetic analysis and SEM characterization. The results show that the optimal leaching conditions are L-malic acid concentration of 0.2 mol/L, ascorbic acid concentration of 0.1 mol/L, liquid volume to solid mass ratio of 0.3 mL/1 mg, reaction temperature of 70 ℃, leaching time of 1 h. Under the conditions, the leaching rates of cobalt and lithium are above 98%. The kinetic analysis shows that the leaching process is mainly controlled by external diffusion. The method is efficient and environmentally friendly, and can provide an important technical reference for the green recovery of lithium cobaltate in waste lithium-ion batteries.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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