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Outline
With cathode powder of spent lithium iron phosphate batteries as raw materials, selective lithium leaching was conducted in a tartaric acid - hydrogen peroxide system. The results indicate that stirring speed and liquid-solid ratio bring slight impact to the leaching rates of lithium and iron, while mass concentration of tartaric acid, leaching temperature and leaching time present remarkable influences. And hydrogen peroxide concentration mainly governs the iron leaching rate. Under the following optimal conditions, including mass concentration of tartaric acid of 150 g/L, stirring speed of 500 r/min, liquid-solid ratio of 6, leaching duration of 3 h, hydrogen peroxide concentration of 3 mol/L and leaching temperature of 70 ℃, the leaching rates of lithium and iron are 98.7% and 4.5% respectively. After the processes of evaporation, concentration and purification, the lithium leachate is subjected to carbonate lithium precipitation, yielding a lithium carbonate product with favorable crystallinity.
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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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