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A roasting and acid leaching process was adopted to extract lithium from a low-grade clay-type lithium ore with a Li2O grade of 0.13%. After exploration of the effects of various factors on lithium leaching rate, including roasting temperature, roasting time, and mass fraction of sulfuric acid, liquid-solid ratio, leaching temperature and leaching time in acid leaching process, the optimal experimental conditions were determined as follows: roasting at 500 ℃ for 1 h, leaching at 95 ℃ for 60 min with sulfuric acid at a mass fraction of 15%, and liquid-solid ratio of 6 mL/g. Under these conditions, the lithium leaching rate can reach 85.26%, indicating that efficient leaching of lithium from such low-grade clay-type lithium ore can be actualized. XRD and SEM analyses of the samples before and after leaching show that lithium leaching is attributed to the exchange between hydrogen ions in the sulfuric acid solution and lithium ions in the mineral.
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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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