Toward Decarbonization of the Titanium Industry via Hydrogen Plasma Smelting Reduction

Surging global demand for titanium, driven by its essential role in aerospace, transportation, chemical industries, and as a white pigment, is intensifying pressure on scarce high-grade ores, like rutile, leading to their rapid depletion. As a result, ilmenite (FeTiO₃) mineral sands are emerging as the cornerstone of future titanium supply. However, conventional ilmenite processing routes are energy-intensive, carbon-emissive, and require multiple reduction and refining stages. Here, a single-step hydrogen plasma reduction process is introduced that simultaneously produces two critical materials for a sustainable economy, high-purity iron and a Titania-rich compound, directly from low-grade ilmenite concentrates, without fossil fuels and direct CO₂ emissions. This process unifies smelting, reduction, and refining (of both iron and Titania oxide mixture) in one operation, at rapid kinetics and selective impurity removal. Silica, an impurity usually removed in a separate chemical step, is reduced by ≈75% within the proposed plasma-based operation, enabling direct downstream use of the Titania-rich compound. The resulting iron achieves purity high enough for direct use in steel production, while the Titania-rich compound serves as an upgraded CO₂-free precursor for titanium metal or pigment production. This work introduces a zero-carbon metallurgical route for maximizing value from low-grade ilmenite while advancing decarbonized industrial metals processing.