Oxidation Kinetics and Mechanism of TiC with Simulated Blast‐Furnace Gases

Abstract

A high amount of TiO2 in the blast‐furnace slag during the smelting of vanadium‐bearing titanomagnetite can generate TiC, resulting in poor metallurgical properties of the slag. Based on this background, the oxidation of TiC by CO2 in the blast‐furnace gas and its kinetics are discussed in this article, to achieve control over the generation of TiC. The results show that TiC is oxidized by the CO2 in the blast‐furnace gas, generating TiO2. The oxidation rate increases upon increasing the oxidation temperature, at all oxidation stages in the same atmosphere. At a given temperature, a higher volume fraction of CO2 in the atmosphere is conducive to the faster oxidation of TiC. The oxidation of TiC is mainly controlled by the interfacial chemical reaction at the initial stage and by the mixed control of the interfacial chemical reaction and internal diffusion at a later stage.