FeO-SiO2-MnO(-TiO2)渣系与铁液间钒的分配行为及影响因素

实验研究了V在FeO-SiO2-MnO(-TiO2)渣系与铁液间的分配行为，以及温度、渣成分、渣铁比、铁水初始Si]、Ti]含量的影响趋势. 结果表明，在FeO-SiO2-MnO渣系中，铁水中V的入渣率、V在渣-金两相的分配比以及渣的钒容量均随温度升高而降低，而铁水中C的氧化损失随温度升高而增加；渣铁比较低的情况下，V的入渣率明显降低，但两种渣铁比的情况下，V的最大入渣率均落在MnO含量13%~25%，SiO2含量12%~24%的成分范围内. 在FeO-SiO2-MnO-TiO2渣系中，随渣中TiO2含量增加，铁水中V的入渣率、V在渣-金两相的分配比以及渣的钒容量随之降低，V2O3在渣中的活度系数随TiO2含量升高而升高. 实验条件下，各因素对铁水中V的入渣率的影响程度按以下顺序依次降低：终渣成分>温度>铁水初始Si]、Ti]等元素含量.

Distribution Behaviors of Vanadium between Hot Metal and FeO-SiO2-MnO(-TiO2) Slag System and Influential Factors

Distribution behavior of vanadium between hot metal and slag system of FeO-SiO2-MnO(-TiO2) was experimentally studied, together with the influential factors such as temperature, slag compositions, ratio of slag to hot metal, and initial Si] or/and Ti] content of hot metal. The results showed that in the ternary slag system of FeO-SiO2-MnO, the extraction rate of V from the hot metal, distribution ratio of V between slag and metal phases, and vanadium capacity of slag decreased with increasing of temperature, while the loss of C in hot metal caused by oxidizing reactions increased; the lower the ratio of slag to hot metal, the lower the extraction rate of V; while in the two cases of higher and lower ratio of slag to hot metal, the extraction rates of V reached their maximum values in the slag composition scope of MnO at 13%~25% and SiO2 at 12%~24%. In the quaternary slag system of FeO-SiO2-MnO-TiO2, with increasing of TiO2 content in slag, the extraction rate of V, distribution ratio of V between slag and metal, and vanadium capacity of slag decreased, while the activity coefficient of V2O3 in slag increased. Under laboratory conditions, the effects of influential factors on the extraction rate of V from hot metal decreased in the following order: final slag compositions > temperature > initial Si] or/and Ti] content.