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In view of the secondary vanadium resources in high-sulfur petroleum coke gasification ash, vanadium was preenriched by oxidation roasting and then recovered by leaching with sulfuric acid. The leaching rule of vanadium from ash of oxidation roasting was investigated, the optimal leaching conditions were determined, and the leaching kinetics was discussed. The results show that under the conditions of temperature of 90 ℃, sulfuric acid concentration of 30%, liquid volume to solid mass ratio of 8∶2 and reaction time of 3 h, vanadium leaching rate in ash can reach more than 72.5% and vanadium mass fraction in acid leaching residue is 1.91%. In the test temperature range, the vanadium leaching rate conforms to the mixing control of the unreacted shrinkage core model,and the apparent reaction activation energy is 22.97 kJ/mol.
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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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