Research On The Indirect Reaction Kinetics Of High Chrome Vanadium-titanium Magnetite

High chrome Vanadium-titanium magnetite is abundant in Panzhihua Hongge mining area, which is able to meet the need of iron ore for blast furnace and also develop high value-added chrome vanadium products. The iron ore with high content chrome can increase the slag viscosity and the slag melting temperature, lead to the blast furnace operation impeded, so this sort of iron ore hasn't been utilized in blast furnace technological process. At present, the research on ordinary vanadium titanium magnetite reduction dynamics is relatively mature, but less on the high chromium vanadium titanium magnetite.In order to study indirect reduction kinetics and improve the quantity of high chromium vanadium-titanium magnetite in blast furnace, this experiment uses the ordinary and high chrome vanadium-titanium magnetite ore, as well as R=1.5-2.3 sinter, at T=1123 k, 1173 k, 1223 k, using thermogravimetric analyzer with atmosphere of 40% CO and 60% Ar in experiment.The following conclusions could be drawn from this work. With the increase of temperature, the end weightlessness rate are increased of ordinary vanadium titanium magnetite ore and sinter, as well as high chrome vanadium titanium magnetite ore and sinter. When T=1123 k, 1173 k, 1223 k, the end weightlessness rate of ordinary vanadium titanium magnetite sinter with basicity change consistently, and presents a trend of decrease first and then increase. But for the high chrome vanadium titanium magnetite sinter, the end weight-loss rate first increases and then decreases with increasing of basicity.The reduction mechanism process of vanadium-titanium magnetite sinter and ore in the reduction atmosphere of CO is very complex. When the conversion rate is under 0.5 and T=1123 K,1173 K,1223 K, all the reduction processes are effected by random nucleation and nucleus growth mechanism. When the conversion rate is over 0.5 and T=1123 K,1173 K,1223 K, all the reduction processes are controlled by random nucleation and nucleus growth mechanism and surface-phasing mechanism...