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.