(北京科技大學(xué) 冶金與生態(tài)工程學(xué)院，北京 100083)
摘 要: 為了提高釩的回收率，增加熔分過(guò)程中渣鐵間釩的分配比，在實(shí)驗(yàn)室條件下，利用分析純?cè)噭芯苛蒜C在CaO-SiO2-MgO-Al2O3-TiO2-V2O3低堿度高鈦渣系與鐵液間的分配行為。結(jié)果表明：在實(shí)驗(yàn)研究范圍內(nèi)，釩在鐵渣間的分配比隨堿度的升高而增加，隨終渣V2O3含量的升高而降低。由熱力學(xué)活度因子模型，終渣堿度與釩含量的變化影響了爐渣和鐵液中釩的活度因子以及表征還原勢(shì)的系統(tǒng)活度因子，從而引起釩還原勢(shì)與分配比的改變。同時(shí)，利用實(shí)驗(yàn)所得釩在渣鐵間分配的相關(guān)數(shù)據(jù)，結(jié)合瓦格納和聚集電子相模型，計(jì)算了釩碳熱還原反應(yīng)的平衡常數(shù)K和吉布斯自由能ΔGΘ，這些值與相關(guān)發(fā)表的數(shù)據(jù)相差較小，誤差分別為1.91%和0.56%，因而，提供了一種較準(zhǔn)確的釩在渣鐵間分配的熱力學(xué)計(jì)算模型。
關(guān)鍵字: 釩；高鈦渣；分配比；相平衡；還原勢(shì)；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
