The effects of super-gravity field on metal–slag separation at different gravity coefficients were investigated in this study. In a super-gravity field, the liquid metal concentrated along the direction of super-gravity, while the molten slag migrated and aggregated along the opposite direction thereafter separated from the metal. Moreover, a straight interface between the metal and slag appeared in the perpendicular direction to the super-gravity. Consequently, increasing the gravity coefficient could definitely increase the driving force of phase separation between metal and slag, and so enhance the removal of oxide and the purity of metal significantly.
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