KINETIC ANALYSIS OF SMELTING REDUCTION OF V_2O_3 IN BLAST FURNACE SLAG BY DISSOLVED CARBON IN LIQUID IRON

摘要

V-Ti magnetite is an important raw material for blast furnace in Pan-Steel (China) to produce vanadium containing liquid iron. In order to understand and improve the vanadium reduction in blast furnace hearth zone, smelting reduction kinetics of V_2O_3 in synthetic blast furnace slag was investigated experimentally and analyzed with double film theory. The phase in slag after reaction was identified by XRD. Results show that the V_2O_3 in the slag was reduced to [V], the diffusion of V_2O_3 in the slag and [V] in the liquid iron were the controlling steps during the overall reduction process. The reaction rate constant was 2.52×10~(-2) mol-V_2O_3/(cm~2• s) at 1723K and activation energy of the reduction reaction was 37.1kJ/mol between 1683K and 1743K.