以煤泥为还原剂海滨钛磁铁矿直接还原焙烧反应历程

研究以煤泥为还原剂,印尼某海滨钛磁铁矿在直接还原焙烧过程中,不同焙烧温度下矿物组成变化规律.X射线衍射和扫描电镜分析结果表明,随着焙烧温度的升高,钛磁铁矿逐渐被还原.其中铁矿物经过浮士体(FeO),最终被还原成金属铁;而钛则经过钛尖晶石最终生成钛铁矿和少部分的铁板钛矿.在整个直接还原焙烧过程中,金属铁颗粒在1100℃左右生成,然后不断长大,在1250℃时金属铁颗粒明显增多,在之后的保温过程中,金属铁颗粒不断长大,并在此过程中将金属铁从中分离出来.

Direct reduction roasting process of seaside titanomagnetite with coal slime as a reductant

The mineral composition variation of Indonesian seaside titanomagnetite at different roasting temperatures was studied in the direct reduction roasting process with coal slime as a reductant. The roasted products were analyzed by X-ray diffraction and scanning electron microscopy. It is found that as the roasting temperature rises the titanomagnetite is gradually reduced. Iron minerals in the titanomagnetite are first reduced to FeO and finally into metallic iron. Titanium minerals contained in the titanomagnetite are first reduced to titanium spinel and finally into ilmenite with a small amount of pseudobrookite. In the direct reduction roasting process, metallic iron particles generate at about 1100℃ and continue to grow. At 1250℃, molten metallic iron particles obviously increase and metallic iron particles continue to grow in the later thermal process. The separation of metallic iron and ilmenite is relized in this process.