Phosphorus Partition in an Industrial Basic Oxygen Furnace Process in Ukraine

Abstract

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.