中文摘要：

运用共存理论建立了钒渣活度计算模型，分析了钒渣成分和温度对渣中FeO、V2O3活度及活度系数的影响；通过实验和理论计算，分析了转炉提钒终点钒渣成分和温度对钒在渣和半钢间分配行为的影响．结果表明，渣中FeO的活度和活度系数随MnO和FeO含量的增加而增加，随V2O3、SiO2和TiO2含量的增加而减小，其值分别在10-1和10^0的数量级上，而渣中V2O3的活度及活度系数在同样条件下的变化与FeO相反，其值分别在10－2和10－1的数量级上；半钢V的质量分数一般在0．02％-0．06％之间，随温度以及渣中V2O3、TiO2和SiO2含量升高而升高，随FeO含量降低而升高；V在渣金间的分配比为100—500，随温度和渣中TiO2、SiO2含量升高而降低，随FeO含量升高而升高；存在一个临界V2O3含量使得V在渣金间的分配比达到最大，该值的理论计算结果为23．77％，实验结果在15％－20％．

英文摘要：

An activity model of vanadium slag was established according to the coexistence theory of slag structure. The influences of vanadium slag compositions and temperature on the activities and activity coefficients of FeO and V203 were analyzed based on the model. The effects of vanadium slag compositions and temperature on the distribution behavior of V between slag and semi-steel at the end point of vanadium extraction by converter were studied by experiments and calculation. It is shown that the activity and activity coefficient of FeO, which are at magnitudes of 10-1 and 10^0 respectively, increase with the increase of FeO and MnO contents but decrease with increasing V203 , SiO2 and TiO2 contents in the slag; the activity and activity coefficient of V203 , which are at magnitudes of 10-2 and 10 -1 respectively, show opposite trends compared with those of FeO under the same conditions. The mass fraction of V usually ranges from 0.02% to 0.06% in semi-steel, increases with the increasing of temperature and V2O3 , SiO2 and TiO2 contents but decreases with increasing FeO content in the slag. The distribution ratio of V between slag and metal phase is in the range of 100 to 500, decreases with increasing temperature and SiO2 and TiO2 contents but increases while the content of FeO in the slag increases. There is a critical V2O3 content that makes the distribution ratio of V between slag and metal phase reach maximum, the theoretical value is 23.77% and the experimental one is from 15% to 20%.