Enriching Fe-bearing and P-bearing phases from steelmaking slag melt by super gravity

Abstract

In this study, Fe-bearing phase and P-bearing phase were successfully enriched from the steelmaking slag by super gravity. After centrifugal enrichment, there was significant stratification presenting in the sample, the upper part was loose and porous, while the lower was compact and tight. With the help of scanning electron microscope (SEM) and X-ray diffraction (XRD), it was found that large quantities of particles for P-bearing phase gathered in the upper part and gradiently distributed along the direction of the super gravity, while the Fe-bearing phase mainly enriched in the lower part, and the enrichment efficiency was proportional to the centrifugal time and gravity coefficient. Under the gravity coefficient G = 800, T = 1663 K and t = 40 min, the mass fraction of P₂O₅ in the P-bearing slag was up to 4.12%, and that of Fe_tO in the Fe-bearing slag was 35.17%. The recovery ratio of P₂O₅ and Fe_tO was up to 77.56 and 60.18%, respectively.