Kinetics of Reduction of Vanadiferous Titanomagnetite ore of Orissa

200 mesh powder of vanadium bearing titaniferous magne-tite ore was pelletised to 0 5 cm dia spheres, heat hardened at 1100'C for z hour in nitrcgen. The pellets were reduced in a calibrated mixture of 60% N2, 40% CO. The temperature vs weight loss was recorded in a Shimad
-zu Thermogravimeter model TGA-31 at 900, 955, 999 and 1050°C. The results conformed to Mc Kewan's phase bound-ary reaction model, yielding an activation energy of 25.5 kcal / mole. No kinetic studies of reduction of titan-omagnetite has been reported. The activation energy for magnetite reduction ranges from 13 to 45 kcal/mole as reported in literature. Presence of TiO 2 is known to hinder reduction kinetics of iron oxides. The observed higher activation energy and slower rate of reduction of titanomagnetite has been explained in terms of its spine/
structure and preferential positions of metal ions.