2 FeTiO3 + 7 Cl2 + 6 C → 2 TiCl4 + 2 FeCl3 + 6 CO
This is an oxidation-reduction (redox) reaction:
6 C0 - 12 e- → 6 CII (oxidation)
14 Cl0 + 14 e- → 14 Cl-I (reduction)
2 FeII - 2 e- → 2 FeIII (oxidation)
C is a reducing agent, Cl2 is an oxidizing agent, FeTiO3 is a reducing agent.