Thermodynamic Assessment of Phosphorus Removal From Si-Fe Levitated Droplets

In this paper, the thermodynamic behavior of phosphorus removal from Si-Fe alloys was investigated using a computational approach based on a molecular interaction model combined with the Miedema model and the Tanaka equation. In the Si-P system, the variation of the infinitely dilute activity coefficient of phosphorus with temperature is given as: ln gamma(pinsi)degrees = -0.02573 -2286.07/T. In the Si-Fe-P system, the variation of the Fe-P interaction parameter as a function of temperature is represented by the expression: epsilon(Fe)(P) = 0.5095 + 548.69/T. Based on the above theoretical analysis, the separation efficiency of phosphorus removal from the Si-Fe-P system was calculated, and the reliability of the model was evaluated using results from dephosphorization experiments conducted with electromagnetically levitated Si-Fe alloy droplets. It is found that a removal efficiency of 94.42 pct can be achieved with a refining time of 55 min at 2023 K in a 50 pct Ar-50 pct H-2 gas atmosphere. [GRAPHICS] .

Automated summary

In this study, the thermodynamic behavior of phosphorus removal from Si-Fe alloys was investigated using a computational approach. The results provide theoretical basis and separation efficiency for the process of phosphorus removal.