摘要:
为了实现钒钛磁铁矿的低温还原,提高金属化率,以NaOH为钠化剂处理钒钛磁铁矿,钒钛磁铁精矿中配加煤粉和NaOH进行直接还原,试验研究了配碳比、直接还原温度、还原时间、Na/Si对直接还原的影响,直接还原后金属化球团利用化学分析法和XRD进行分析。研究结果表明:NaOH可以大幅降低钒钛磁铁矿的直接还原温度、显著改善还原效果。当Na/Si=0时,1 150℃、还原时间50 min,球团金属化率仅为79.87%;当Na/Si=5.0时,1 150℃,仅需30 min,球团金属化率可达93.17%。通过XRD检测结果可知,金属化球团内已形成钛、硅、铝相应的钠酸盐。NaOH的加入可以促进含铁矿物的还原,大幅降低能耗。
Abstract:
In order to reduce the direct reduction temperatures of vanadium titano-magnetite and improve the metallization ratio of pellets,sodium-treatment was adopted to the direct reduction of vanadium titano-magnetite.The vanadium titano-magnetite was direct reduced with coal and NaOH,and the influences of C/O,temperature,time,Na/Si on direct reduction were studied,the chemical analysis and XRD were used to measure metallized pellets as well.The results show that NaOH can reduce the direct reduction temperature and improve the reducibility performance of vanadium titano-magnetite significantly.The metallization ratio of pellets reduced at 1 150 ℃ for 50 min without NaOH is only 79.87%;the metallization ratio of pellets reduced can reach 93.17% at 1 150 ℃ for 30 min with Na/Si=5.0.XRD analysis indicates that titanium,aluminum and silicon oxides have been changed into the sodium salt respectively in the metallized pellet.The addition of NaOH is favorable for the reduction of iron bearing minerals,and the energy consumption can be greatly reduced.
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