Full
Outline
Aiming at the problems of excessive local supersaturation in the traditional vanadium precipitation process of high sodium alkaline stripping vanadium-rich solution, which leads to explosive nucleation and serious mechanical entrainment of impurities, the preparation of ammonium metavanadate (AMV) precursor by constant pH two-fluid controlled crystallization process was studied, and then high purity V2O5 was obtained by calcination. The effects of ammonium addition coefficient, reaction time and temperature on the vanadium precipitation rate and product purity were systematically investigated by combining the slow flow of vanadium precipitation buffer and constant pH control. The phase composition, microstructure and impurity distribution of the product were analyzed by XRD, SEM and ICP-OES. The results show that the precipitation rate of vanadium can reach 98.5% under the conditions of ammonium addition coefficient of 1.5, reaction time of 120 min and temperature of 85 ℃. The precursor obtained by controlled crystallization exhibits an ordered stacking structure of short column and thick plate, which significantly improves the common disorderly flocculation and mother liquor encapsulation in traditional rapid precipitation. After calcination at 500 ℃ for dehydration and deamination, the morphology of the precursor is reconstructed. Despite the thermodynamic impurity concentration effect, the purity of the final V2O5 is still as high as 99.89%. This process can effectively inhibit impurity entrainment in high-sodium systems at the source, providing a feasible pathway for the green preparation of high-purity V2O5 and demonstrating certain application prospects.
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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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