Effects of Influencing Factors on Distribution Behaviors of Vanadium between Hot Metal and FeO-SiO_2-MnO (-TiO_2) Slag System

摘要

The distribution behavior of vanadium between a hot metal and a FeO-SiO_2-MnO (-TiO_2) slag system was studied under laboratory conditions, together with the effects of influencing factors such as temperature, slag composition, the ratio of slag to hot metal, and the initial Si and/or Ti content in hot metal. The results suggested that in a ternary FeO-SiO_2-MnO slag system, with an increase in temperature and an increase in the SiO_2 content of slag, the extraction ratio (η_V), distribution ratio of V (L_V) and the vanadium capacity of the slag (C_(VO_3~(3-)) decreased, while the effect of MnO content in slag showed a different tendency under different situations. For both high and low ratios of slag to hot metal, the extraction ratio of V reached its maximum value under slag compositions of 13%-25% MnO and 10%-24% SiO_2, which correspond to the regions with lower melting point and lower viscosity of the slag. In a quaternary FeO-SiO_2-MnO-TiO_2 slag system, η_V,L_V, and C_(VO_3~(3-)- decreased, while the activity coefficient of V_2O_3 increased, as the TiO_2 content increased. Further, the data suggested that under laboratory conditions the effects of influencing factors on the extraction ratio of V from hot metal decreased in the following order: final slag composition > temperature > initial Si and/or Ti content in hot metal.