Investigation of P₂O₅ on the Break Temperature and Phase Composition of Slag from the Double Slag Converter Steelmaking Process

Herein, the influence of P 2 O 5 on the break temperature and phase composition of slag from the double slag converter steelmaking process is investigated comprehensively. The composition and micromorphology of crystallized phase are analyzed by X‐Ray diffractometer and scanning electron microscope equipped with energy dispersive spectrometer. The results reveal that the break temperature of slag increases owing to an increase of P 2 O 5 content. When the P 2 O 5 content is 2%, the break temperature is 1198 °C, and it increases to 1209 °C for the slag with 4% P 2 O 5 . With the increase of P 2 O 5 content from 2% to 8%, the activation energy for viscous flow shows an upward trend. The crystallized phase at the same temperature with different P 2 O 5 contents remains nearly unchanged, but the diffraction peak intensity is different. When the P 2 O 5 content remains constant, a decrease in temperature results in significant changes in the micromorphology of crystallized phases. The present results improve the knowledge about the P‐rich slag, and are also significant in optimizing the double slag converter steelmaking process.