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For phosphorus-iron waste left after lithium extraction from cathode powder of spent lithium iron phosphate (LFP) batteries, a selective leaching with sulfuric acid was adopted to remove impurities therein. The results indicate that after a 4-stage leaching at 80 ℃ for 2 h, with a sulfuric acid at a concentration of 0.32 mol/L and a liquid-to-solid ratio of 5 mL/g, the total leaching rates of elemental impurities, including Cu, Mn, Al, Ca, Na and Mg reach 70.81%, 68.33%, 65.57%, 68.03%, 67.85% and 64.28%, respectively, and the total leaching rates of P and Fe are only 2.52% and 2.24%, respectively. It is concluded that the main elemental impurities can be effectively leached out from such phosphorus-iron waste, with elements of P and Fe left for subsequent resource utilization.
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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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