Influence of TiO2 addition on the oxidation induration and reduction behavior of Hongge vanadium titanomagnetite pellets with simulated shaft furnace gases

摘要

This study investigated the oxidation induration of Hongge vanadium titanomagnetite pellets (HVTMP) with different TiO2 additions, and its influence on subsequent reduction behavior with simulated shaft furnace gases. The results showed that the addition of TiO2 decreased the compressive strength and increased the porosity of the HVTMP, and eventually had a detrimental effect on the oxidation induration process. The oxidation induration mechanism was further elucidated by the means of XRD and SEM. When more TiO2 was added, the reduction degree and rate of the HVTMP decreased due to the generation of Fe2TiO5 during the oxidization induration process, which was unfavorable for the subsequent reduction process. The morphology structure confirmed that the growth of metallic iron whiskers was suppressed with an increase in TiO2, which resulted in the decrease of reduction swelling. Furthermore, the reduction swelling and compressive strength of the reduced HVTMP exhibited a reverse linear relationship. The current study not only provides experimental evidence to establish a correlation between TiO2 addition and oxidation reduction behavior, but also provides both a theoretical and technical basis for the effective utilization of Hongge vanadium titanomagnetite either in blast furnace or shaft furnace. (C) 2017 Elsevier B.V. All rights reserved.