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To address the issues of high energy consumption, low efficiency, difficult recovery and easy secondary pollution in the pyrometallurgical recovery of lithium from solid waste, the enhanced leaching of lithium from discarded lithium aluminum silicate (Li2O-Al2O3-SiO2, LAS) glass-ceramics samples using a mixed acid of HF/H2SO4 as the leaching agent was studied. The effects of liquid volume to solid mass ratio, sulfuric acid mass concentration, leaching temperature, leaching time, stirring speed and raw material particle size on the leaching rate of lithium were investigated, as well as the effects of liquid volume to solid mass ratio and leaching temperature on the leaching rates of aluminum and silicon. The kinetics of lithium leaching was also explored. The results show that under the optimal conditions of m(sample)∶ V(HF)∶V(H2SO4)=1∶2.5∶2, particle size of -0.074 mm, sulfuric acid mass concentration of 900 g/L, leaching temperature of 60 ℃, leaching time of 120 min, and stirring speed of 200 r/min, the leaching rate of lithium can approach 99%. Compared with other influencing factors HF volume to sample mass ratio and leaching temperature have a greater impact on the leaching rate of lithium. In contrast, the HF volume to sample mass ratio and leaching temperature have a greater effect on the leaching of aluminum than that of silicon. The leaching of lithium conforms to the unreacted core shrinkage model, with an apparent activation energy Ea of 39.53 kJ/mol, and the leaching rate of lithium is controlled by the chemical reaction-internal diffusion mixed control. The research results can provide theoretical guidance for the recovery and reuse of valuable elements from discarded LAS glass-ceramics.
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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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