以高铬型钒钛磁铁矿制备氧化球团

Preparation of Oxidized Pellets with High Chromium Vanadium-Titanium Magnetite

研究了高铬型钒钛磁铁矿的基础特性,在此基础上考察了该矿对氧化球团制备工艺和冶金性能的影响规律,探索了获得优质氧化球团的高铬型钒钛磁铁矿的最大质量分数.结果表明:高铬型钒钛磁铁矿主要由磁铁矿、镁铁矿、铬铁矿、镁钛矿、钒磁铁矿、钛磁铁矿等组成,其粒度粗,连晶强度较差;随球团原料中高铬型钒钛磁铁矿质量分数的增加,生球性能无显著变化,成品球团抗压强度降低,当其质量分数高于20%时,不能满足高炉生产要求.增大高铬型钒钛磁铁矿的质量分数有助于降低球团矿的还原膨胀率,当其质量分数由0增加到20%时,球团的还原膨胀率由32.1%降低到21.1%.

The effects of the high chromium vanadium-titanium magnetite ores on the oxidized pellet preparation process and metallurgy properties were investigated and its largest mass fraction for superior quality of the oxidized pellets was also explored according to the research on fundamental characteristics of the ores. The results showed that the high chromium vanadium- titanium magnetite mainly composed of magnetite, magnesioferrite, chromite, geikielite, coulsonite and titanomagnetite etc. , of which the particle size was large, and crystal stock strength was low. With the increase of the mass fraction of high chromium vanadium-titanium magnetite in the raw materials of the pellets, the properties of green pellets had no significant changes, but the compressive strength of the finished oxidized pellets decreased, when the mass fraction of the ores was greater than 20% , the compressive strength couldn＇ t meet the requirement of the blast furnace production. On the other hand, increasing the mass fraction of high chromium vanadium- titanium magnetite was conducive to reduce the reduction swelling rate of the pellets. When its mass fraction increased from 0 to 20% , the reduction swelling rate decreased from 32. 1% to 21.1% accordingly.