Linking Microstructural Evolution to the Reduction Behavior of FeTiO3 in CO–H2 Atmospheres

Understanding the H 2 -rich reduction behavior and mechanism of the single-phase pseudobrookite (FeTiO 3 ) is essential for the green utilization of the strategic resource vanadium titanomagnetite. In this work, the reduction behavior of FeTiO 3 under CO–H 2 atmospheres was systematically investigated via non‑isothermal thermogravimetric experiments. The study focused on key parameters including the reduction degree, reduction rate, post‑reduction microstructure, and the particle size distribution of the resulting metallic iron and porosity. The results reveal that the promoting effect of H 2 -rich on macroscopic reduction behavior of FeTiO 3 originates from microstructural evolution, linking pore development and iron particle refinement.