Thermodynamic Calculation and Experimental Study on Pre-reduction of Vanadium-titanium Iron Concentrate in Shaft Furnace
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摘要: 采用热力学计算软件HSC对攀枝花钒钛铁精矿内配碳球团竖炉预还原进行了平衡组分、金属化率和还原度的计算；试验研究了内配碳球团不同的竖炉预还原工艺下的金属化率和还原度。研究结果表明：随着反应温度升高，内配碳球团的金属化率和还原度呈现升高的趋势，当温度达到800℃左右，体系中金属化率达到最大值为99.2%；温度升高到1 000℃，还原度达到最大值87.2%；试验得到的金属化率和还原度变化规律与理论相符。在1 200℃时，获得最大金属化率和还原度分别为：85.23%和80.15%。当底部吹入还原性气氛（10% N2+30% H2+60% CO）时，1 200℃达到的最大金属化率和还原度分别为：88.43%和90.42%。因此，在体系中通入还原性气体，还原过程被明显强化。Abstract: The equilibrium compositions,metallization rate and reduction degree of carbon-added pellets of Panzhihua vanadium-titanium iron concentrate pre-reduced in shaft furnace were calculated by HSC software.The metallization rate and reduction degree of the carbon-added pellets at different pre-reduction processes were studied experimentally.The experimental results show that with the increase of reaction temperature the metallization rate and reduction degree of the pellets increase,and the maximum metallization rate of 99.2% can be obtained at 800 ℃.The maximum reduction degree reaches 87.2% when the temperature rises to 1 000 ℃.The variation of metallization rate and reduction degree coincides well with the theory predictions.The maximum metallization rate and reduction degree are respectively 85.23% and 80.15% at 1 200 ℃.With the reduction atmosphere of 10% N2+30% H2+60% CO introduced from the bottom,the maximum metallization rate and reduction degree of 88.43% and 90.42% can be respectively gained at 1 200 ℃.Therefore,the reduction process can be reinforced obviously in circumstance of introducing reduction gas into the system.
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