Theoretical and Thermal Simulation of Vanadium Extraction from Molten Iron in Combination Blowing Converter
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摘要: 采用共存理论计算了提钒炉渣V2O3-SiO2-TiO2-Cr2O3-MgO-MnO-FeO中V2O3的活度系数,研究了炉渣组元、温度对V2O3活度系数的影响,得到V2O3的活度系数为0.5×10-6~9.0×10-6。通过对V-C平衡进行研究,得出了V-C氧化的转化温度为1380℃,即吹炼过程铁水控制温度。采用具备顶底复吹功能的500kg中频感应炉模拟了复吹转炉铁水提钒工艺,试验结果表明:吹炼终点钒质量分数平均为0.06%,钒氧化率为95%。底吹搅拌可以显著加速铁水中钒的氧化,缩短3min的冶炼周期。Abstract: Based on the ion and molecule coexistence theory,we calculated the activity coefficient of V2O3 in the vanadium removing slag V2O3-SiO2-TiO2-Cr2O3-MgO-MnO-FeO,the influence of vanadium composition、temperature on the activity coefficient of V2O3 has been investigated,the activity coefficient of V2O3 is between 0.5×10-6 and 9.0×10-6.Through studying the vanadium-carbon reaction equilibrium,the oxidation transformation temperature of vanadium and carbon is 1 380℃,which is the temperature control during blowing.The vanadium removal in combination blowing converter process was simulated by experiment in 500 kg intermediate frequency induction furnace with top and bottom blowing function,the experiment results shows:at the end point of blowing the average vanadium content in hot metal was 0.06%,vanadium oxidation rate was 95%.In addition,bottom blowing can accelerate vanadium oxidation,shorten 3 minutes oxygen supply time.
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