Full
Outline
In consideration of disadvantages of long process flow and low total recovery of lithium for the traditional preparation process of battery-grade lithium carbonate, it is proposed that a combined process consisting of impurity removal, transformation of sulfate radicals and thermal decomposition be adopted to directly prepare battery-grade lithium carbonate from polymetallic lithium sulfate solution, and then solvent extraction should be employed to recover lithium from washing water and mother liquor of lithium precipitation. In the impurity removal process, the pH of solution is adjusted to 10.0, and sodium dimethyldithiocarbamate (SDD) is added for deep removal of impurities; the obtained solution is added with barium carbonate paste, with a solid-liquid ratio of 1∶12 and a CO2 flow rate of 60 L/h, and the transformed lithium bicarbonate solution is generated after 1 h reaction; in the following thermal decomposition stage, lithium carbonate solid is produced after 90 min reaction at 91-92 ℃ by adding an appropriate amount of calcium and magnesium ion chelating agent, stirring at a rate of 400 r/min. After washing with deionized water and drying, a battery-grade lithium carbonate product is produced with a purity of 99.85%. The washing water is combined with the mother liquor of lithium precipitation, and then subjected to solvent extraction, resulting in a stripping solution with a lithium content of 26.22 g/L. It is shown that the total lithium recovery rate from this process can reach 98.08%.
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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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