钒钛磁铁矿直接还原试验研究  

Experimental Study on Direction Reduction of VanadiumBearing Titanomagnetite

作　　者：孙瑜[1] 董越[1] 郑海燕[1] 沈峰满[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2015年第1期63-67,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51074040);辽宁省自然科学基金资助项目(201202064);中央高校基本科研业务费专项资金资助项目(N120402004)

摘　　要：在热力学分析的基础上研究了实验室条件下钒钛磁铁矿配煤直接还原的特点,考察了还原机理及还原温度、反应时间和配碳量对金属化率的影响.结果表明:采用直接还原可使钒钛磁铁矿中铁的氧化物优先还原为金属铁,钛仍以氧化物的形态存在;随着温度升高,球团金属化率呈上升趋势,且上升趋势随之减缓;在xC/xO=0.9∶1时,延长反应时间金属化率增加,但反应时间过长金属铁会被再氧化,反应时间控制在20 min为宜;在xC/xO=1.1∶1时,40 min内未出现再氧化现象;低配碳(xC/xO=0.8∶1)时,球团的金属化率随还原时间、还原温度的增加而增加,1 300℃下还原10 min后金属化率即达到了90%以上.The direct reduction behavior of vanadium-bearing titanomagnetite pellets containing coal was experimentally studied in laboratory based on thermodynamic analysis. The reduction mechanism and influences of reduction temperature, reduction time, and the Xc/Xo on metallization ratio were investigated. The results showed that direct reduction iron （DRI） can be obtained in this process, while titanium exists as the form of titanium oxide in the slag. With the increase of reduction temperature, the metallization ratio increases quickly first and then slowly. For carbon- containing pellets with 0.9 of Xc/Xo, the metallization ratio reached the highest at 20 min and DRI was re-oxidized after 20 min. When the Xc/Xo in the pellets was 1.1 ： 1, no re-oxidization happened within 40 rain. With less coal addition （0 with that of 1.1 of Xc/Xo and the metallization ratio 8 of Xc/Xo）, there were similar phenomena was up to 90 % at 1 300 ℃ after 10 min.

关 键 词：钒钛磁铁矿 直接还原 热力学分析 金属化率 含碳球团 

分 类 号：TP556[自动化与计算机技术]