(北京科技大学 冶金与生态工程学院，北京 100083)
摘 要: 为了提高钒的回收率，增加熔分过程中渣铁间钒的分配比，在实验室条件下，利用分析纯试剂，研究了钒在CaO-SiO2-MgO-Al2O3-TiO2-V2O3低碱度高钛渣系与铁液间的分配行为。结果表明：在实验研究范围内，钒在铁渣间的分配比随碱度的升高而增加，随终渣V2O3含量的升高而降低。由热力学活度因子模型，终渣碱度与钒含量的变化影响了炉渣和铁液中钒的活度因子以及表征还原势的系统活度因子，从而引起钒还原势与分配比的改变。同时，利用实验所得钒在渣铁间分配的相关数据，结合瓦格纳和聚集电子相模型，计算了钒碳热还原反应的平衡常数K和吉布斯自由能ΔGΘ，这些值与相关发表的数据相差较小，误差分别为1.91%和0.56%，因而，提供了一种较准确的钒在渣铁间分配的热力学计算模型。
关键字: 钒；高钛渣；分配比；相平衡；还原势；活度因子
（School of Metallurgical and Ecological Engineering,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract:In order to improve the vanadium recovery rate and the vanadium distribution ratio between slag and molten iron, the distribution behaviors of vanadium between molten iron and low basicity and high titanium slag of CaO-SiO2-MgO-Al2O3-TiO2-V2O3 was studied using analytical-grade reagent under laboratory conditions. The results show that, the distribution ratios of vanadium increase as the basicity of final slags increase and decrease as the V2O3 content increase. Based on the thermodynamic activity factor models, the variation of basicity and vanadium content of final slags affect the vanadium activity coefficients in molten iron and slag, which leads to the change of vanadium reduction potential and distribution ratio. At last, equilibrium constant K and Gibbs free energy ΔGΘ of carbothermic reduction of vanadium were calculated by the distribution ratios of vanadium obtained from the experiments and Wagner and Aggregate-electron-phase models.
Key words: vanadium; high titanium slag; distribution ratio; phase equilibria; reduction potential; activity factor
