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<p>In recent years, the direct reduction-melting separation process has attracted widespread attention for vanadium titanomagnetite (VTM). During the melting separation process, fluxes are commonly used to enhance the metallurgical properties of the slag. However, the fluxes not only increase production costs but also complicate the Ti/V-rich phases in the slag, making their extraction more challenging. In this study, VTM was directly reduced with hydrogen (H<sub>2</sub>). The degree of reduction was controlled by adjusting the reduction time, resulting in three distinct stages: Fe + FeTiO<sub>3</sub>, Fe + FeTi<sub>2</sub>O<sub>5</sub>, and Fe + TiO<sub>2</sub>. The corresponding actual metalization rates of iron were 86.15, 93.31, and 99.87 pct, respectively. Subsequently, the reduced products from these three stages were flux-free melted in an induction furnace, and their melting separation behavior, slag metallurgical properties, mineral composition, and the occurrence phases of Ti and V were investigated. The results showed that a flux-free melting and separation process is feasible when VTM is reduced to the FeTi<sub>2</sub>O<sub>5</sub> stage. At the FeTi<sub>2</sub>O<sub>5</sub> stage, the slag had a melting point of 1724 K and a viscosity of 0.06 Pa&#xa0;s at 1873 K. The reduction and melting times required were relatively short, and the slag-metal separation was excellent, with Ti and V almost entirely enriched in the slag. The content of Ti and V in the slag was the highest at this stage, and the slag contained only pseudobrookite, spinel, and silicate phases. Among these, pseudobrookite was the only Ti/V-enriched phase, exhibiting a regular morphology, large grain size, and clear boundaries with the other two phases.</p>

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Melting and Separation Behavior of H2-Reduced Vanadium Titanomagnetite at Various Reduction Degrees Under Flux-Free Conditions

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Xudong Fang,
  • Jie Zhang,
  • Baijun Yan

摘要

In recent years, the direct reduction-melting separation process has attracted widespread attention for vanadium titanomagnetite (VTM). During the melting separation process, fluxes are commonly used to enhance the metallurgical properties of the slag. However, the fluxes not only increase production costs but also complicate the Ti/V-rich phases in the slag, making their extraction more challenging. In this study, VTM was directly reduced with hydrogen (H2). The degree of reduction was controlled by adjusting the reduction time, resulting in three distinct stages: Fe + FeTiO3, Fe + FeTi2O5, and Fe + TiO2. The corresponding actual metalization rates of iron were 86.15, 93.31, and 99.87 pct, respectively. Subsequently, the reduced products from these three stages were flux-free melted in an induction furnace, and their melting separation behavior, slag metallurgical properties, mineral composition, and the occurrence phases of Ti and V were investigated. The results showed that a flux-free melting and separation process is feasible when VTM is reduced to the FeTi2O5 stage. At the FeTi2O5 stage, the slag had a melting point of 1724 K and a viscosity of 0.06 Pa s at 1873 K. The reduction and melting times required were relatively short, and the slag-metal separation was excellent, with Ti and V almost entirely enriched in the slag. The content of Ti and V in the slag was the highest at this stage, and the slag contained only pseudobrookite, spinel, and silicate phases. Among these, pseudobrookite was the only Ti/V-enriched phase, exhibiting a regular morphology, large grain size, and clear boundaries with the other two phases.