Phosphorus Partition Between Liquid Crude Steel and High-Basicity Basic Oxygen Furnace Slags Containing V2O5

Vanadium is an important micro‐alloying element for various steel grades. Consequently, it is also present in the slags used in the production of those grades. During steelmaking, the vanadium vaporization from the slag is not desirable, as it increases vanadium consumption and at the same time releases toxic vapors of its higher oxides. However, the recovery of vanadium from the slag after the processing is worthwhile. In oxidic form as vanadium pentoxide (V2O5), vanadium can be extracted from the slag. In this research, the vaporization behavior of vanadium from CaO–SiO2–MgO–Al2O3 industrial slag is investigated at 1873 K. The effect of different process parameters, e.g., the pressure in the furnace chamber, the duration of the oxygen treatment of the slag, and the oxygen flow rate, is considered. The effect of P2O5 and Fe2O3 addition on the extraction of vanadium is studied. It is possible to induce formation of V2O5 gas bubbles in the slag due to the oxidation of vanadium. Thus, vanadium respectively V2O5 is extracted from the slag.

Extraction of Vanadium from CaO–SiO₂–MgO–Al₂O₃ Slags Based on Vaporization of Vanadium Pentoxide

Neubert,

Shyrokykh,

Tinkova

et al. 2024

Direct Reduction of Solid V₂O₅ with Hydrogen at 600–1400 °C

Levchenko,

Kovtun,

Guhl

et al. 2024

In this study, it is aimed to assess the feasibility of converting vanadium pentoxide into vanadium metal via hydrogen reduction. To achieve this, V2O5 powder is pressed into a cylindrical shape and subjected to a reduction in a high‐temperature microscope under a constant hydrogen flow rate of 0.5 L min−1, within a temperature range of 600–1400 °C. The experimental results are complemented by thermodynamic calculations using FactSage 7.2. The microstructure and composition of the samples are analyzed using scanning electron microscopy with energy‐dispersive X‐ray spectroscopy and X‐ray diffraction analyses. Subsequent to the experiment, only V2O3 and VO are identified in the samples, and no metallic vanadium is observed.

Phosphorus Partition in an Industrial Basic Oxygen Furnace Process in Ukraine

Volkova,

Tinkova,

Onaa

et al. 2024

Phosphorus partition data from Ukrainian integrated steel plants are analyzed, focusing on the influence of parameters such as the basicity (CaO/SiO2), optical basicity, tapping temperature, and the contents of (FeO), (MgO), and (Al2O3) in the slag. It is found that the phosphorus partition decreases with increase in tapping temperature and increases with the optical basicity. An increase in the phosphorus partition (P)/[P] followed by a decrease with increase of (CaO/SiO2) are observed. It is found that the optimal value, break point at which phosphorus partition changes its dependence to opposite, has a direct dependence on tapping temperature. At (CaO/SiO2) = 1.9–2.1, (P)/[P] increases linearly with increasing (FeO). However with higher value of (CaO/SiO2) the breaking point when (P)/[P] starts to decrease with increase in (FeO) is noticed. Thereby the optimal value of (FeO) decreases with increasing tapping temperature. In case of (Al2O3) there is only decreasing of (P)/[P] with all (CaO/SiO2) and tapping temperatures. Moreover, the effect of (MgO) varies with (CaO/SiO2). These industrial results are supported by thermodynamic simulations using FactSage 8.1 and aligned with existing results from the literature.