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Leaching of vanadium from stone coal vanadium ore by blank roasting—acid leaching process was studied. The effects of grinding fineness, roasting time, roasting temperature, sulfuric acid addition dosage, leaching aid CaF2 addition dosage, leaching temperature, leaching time and liquid volume to solid mass ratio on vanadium leaching rate were investigated. The results show that the optimum blank roasting conditions are grinding fineness 70% of -74 μm, roasting temperature of 775 ℃ and roasting time of 5 h. The optimum acid leaching conditions are sulfuric acid addition dosage of 10%, leaching aid CaF2 addition dosage of 3%, liquid volume to solid mass ratio of 1.5∶1, leaching temperature of 25 ℃ and leaching time of 1.5 h. Under suitable conditions vanadium leaching rate can reach 81.5%.
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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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