To ascertain the thermodynamic conditions for the enrichment of vanadium in V-bearing steelmaking slag and V-bearing black shale, the effects of alumina content and basicity on the formation of phases and distribution of vanadium in CaO-SiO2-FeOt-MgO-Al2O3-V2O3-P2O5 slag system at 1573 K (1300 °C) were investigated by adopting the high-temperature quenching method. The phases formed in the samples were characterized by X-ray diffractometry and scanning electron microscopy combined with energy dispersive spectroscopy. For slags with a basicity of 1.7, it was found that nearly all of the vanadium were concentrated in the (Fe, Mg)O·(Al, Fe, V)2O3 spinel. For slags with basicities of 1.5 and 1.3, vanadium was almost not found in the supercooled glass phase when the alumina content was less than 6 mass pct. However, some vanadium was present in the supercooled glass phase when the alumina content was more than 6 mass pct. For slags with a basicity of 1.0, vanadium migrated between the V-rich spinel and the supercooled glass phase. With an increase in the alumina content from 2 to 10 mass pct, the vanadium content in the spinel phase decreased from 28 to 33 mass pct to approximately 10 mass pct. From these results, it can be concluded that the increase in alumina content and decrease in basicity of the slag are unfavorable for the enrichment of vanadium present in the spinel.

中文翻译：

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氧化铝对 CaO-SiO2-FeOt-MgO-Al2O3-V2O3-P2O5 渣在 1573 K (1300 °C) 中富钒尖晶石相行为的影响

确定含钒炼钢渣和含钒黑色页岩中钒富集的热力学条件，氧化铝含量和碱度对CaO-SiO2-FeOt-MgO-Al2O3-中钒相形成和分布的影响采用高温淬火方法研究了 1573 K (1300 °C) 的 V2O3-P2O5 渣体系。样品中形成的相通过 X 射线衍射和扫描电子显微镜结合能量色散光谱进行表征。对于碱度为 1.7 的炉渣，发现几乎所有的钒都集中在 (Fe, Mg)O·(Al, Fe, V)2O3 尖晶石中。对于碱度为 1.5 和 1.3 的炉渣，当氧化铝含量小于 6 质量％时，在过冷玻璃相中几乎没有发现钒。然而，当氧化铝含量超过 6% 时，一些钒存在于过冷玻璃相中。对于碱度为 1.0 的炉渣，钒在富钒尖晶石和过冷玻璃相之间迁移。随着氧化铝含量从 2 质量百分比增加到 10 质量百分比，尖晶石相中的钒含量从 28 质量百分比到 33 质量百分比减少到大约 10 质量百分比。从这些结果可以得出结论，氧化铝含量的增加和炉渣碱度的降低不利于尖晶石中钒的富集。尖晶石相中的钒含量从 28 到 33 质量 pct 减少到大约 10 质量 pct。从这些结果可以得出结论，氧化铝含量的增加和炉渣碱度的降低不利于尖晶石中钒的富集。尖晶石相中的钒含量从 28 到 33 质量 pct 减少到大约 10 质量 pct。从这些结果可以得出结论，氧化铝含量的增加和炉渣碱度的降低不利于尖晶石中钒的富集。