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The dust generated during chlorination process in recovering titanium by metallurgical process was washed with water. Then, the residue left after water-washing was subjected to calcification roasting process, and the effects of roasting temperature and roasting time on the leaching rate of vanadium from the residue were studied. The results indicate that vanadium in the dust from chlorination process mainly exists as low-valent vanadium, and the vanadium leaching rate increases with the rising temperature. The vanadium leaching rate reaches 88% with the roasting temperature of 850 ℃. As the roasting time increases, the previously obtained different products undergo a secondary reaction, forming insoluble compounds of vanadium bronze, and also vanadate with different valences, which results in different vanadium leaching rates in Na2CO3 solution. It is concluded that the roasting process should be optimally at temperature of 850 ℃ with a roasting time of 120 minutes.
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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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