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The extraction of lithium and defluorination from lithium aluminum waste electrolyte by sulfuric acid leaching—lime precipitation was studied. The effects of various process parameters on the leaching rate and defluorination rate of lithium were investigated. The results show that under the optimal conditions of sulfuric acid concentration of 1.2 mol/L, leaching temperature of 95 ℃, leaching time of 20 min, liquid volume to solid mass ratio of 4/1, pH=7, precipitation time of 1 h, precipitation temperature of 95 ℃, the comprehensive leaching rate of lithium is 85%, and the defluorination rate can reach 99.91%. The addition of calcium oxide can promote the conversion of fluoride ions in the solution to calcium fluoride precipitation, and CaF2 products with high crystallinity are obtained. The pH of the treated solution can meet the requirements for the preparation of lithium carbonate, and the separation and recovery of fluoride and lithium containing solution can be realized.
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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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