Feb 01, 2012 · Ilmenite is a common mineral found in metamorphic and igneous rocks. The ilmenite used is a concentrate from a natural ore. Fresh particles have been exposed to thermal pre-treatment at 950 °C in air during 24 h, since it improves its performance as oxygen-carrier , . Table 1 shows the main properties for calcined ilmenite. The XRD analysis of calcined ilmenite revealed that Fe 2 TiO 5 and