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Vanadium slag and sodium carbonate, as raw materials, were mixed and grounded for pretreatment. The obtained mixture was then taken in a roasting experiment for investigating effects of factors, such as holding time, temperature and feeding materials for roasting process with different alkali ratios (a mass ratio of sodium carbonate to the converted content of V2O5 in vanadium slag) on transformation and leaching rate of vanadium from clinker, and also exploring phase transformation of vanadium slag during the roasting with a low alkali ratio. The results show that if roasting process at higher temperatures is held for 90 minutes, the alkali ratio in the roasting process can be reduced by properly increasing the temperature. After roasting at a temperature of 880 ℃ with an alkali ratio of 1.0, water leaching can result in the total vanadium (TV) content in the residue falling down to 0.49% and the leaching rate of vanadium up to 94.70%. This method is suitable for sodium roasting in a rotary kiln. Under the existing process conditions for sodium roasting of vanadium slag in a multiple hearth furnace, an addition of some clinker into the material for roasting is beneficial to reducing the alkali ratio. It is shown that after roasting is held for 45 minutes at 780 ℃ with an alkali ratio of 1.2, the TV content in the final leaching residue can fall to 0.96% and the leaching rate can reach 89.19%. The microscopic analysis of the clinker after roasting with a low alkali ratio show that there is a high aggregation of sodium vanadate phase, which is in good consistency with NaVO3 in the elemental composition.
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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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