用综合加权评分法优化高铬型钒钛矿电热熔分工艺

以气基竖炉还原得到的金属化率为95%的高铬型钒钛磁铁矿球团为原料,在高频感应炉内进行电热熔分深度还原.设计了三因素三水平正交试验,重点考察熔分温度、熔分时间及二元碱度对熔分效果的影响,并运用综合加权评分法对试验结果进行分析,发现熔分后可获得含钒、铬铁块和高钛渣.适宜的高铬型钒钛磁铁矿电热熔分参数为:二元碱度1.1,熔分温度1 650℃,熔分时间45 min.对熔分综合指标影响大小依次为二元碱度熔分温度熔分时间.另外,分析二元碱度对熔分效果的影响规律及作用机理可知,随碱度增大,铁、钒、铬及钛的收得率呈先上升后下降的趋势,在二元碱度为1.1时,高铬型钒钛矿熔分效果最好.

Optimization of High Chromium Vanadium-Titanium Magnetite Electric Melting Process by Comprehensive Weighted Scoring Method

High chromium vanadium-titanium magnetite pellet with metallization rate of 95%， obtained from gas-based shaft furnace reduction， was used for melting and separation in a high-frequency induction furnace. Through the three factors with three levels orthogonal test， the influences of melting temperature， melting time and binary basicity on the recovery of iron， vanadium， chromium and titanium were studied. Then， the results were analyzed by comprehensive weighted scoring method， and the iron containing V and Cr and the slag bearing Ti are obtained finally. The results show that the optimal parameters of melting and separation for high chromium vanadium-titanium magnetite pellet are the binary basicity of 1.1， the temperature of 1650℃ and the time of 45min. The effect of the melting index are as follows:binary basicity，melting temperature and melting time.Moreover， the effect of binary basicity on the recovery rate was studied. It was indicated that all the recovery rate increases first and then decreases with the rising binary basicity. The rational binary basicity is 1.1.