Fine particles in primary aluminum jeopardize the quality of aluminum production. Supergravity-induced filtration with an Al2O3 ceramic foam filter (Al2O3 CFF), used to purify primary aluminum, is proposed in this study. During the purification process, Al2O3 particles and Fe-rich phases prematurely precipitated around the Al2O3 particles, and were intercepted either on the surface of the Al2O3 CFF by being wrapped in alumina film or inside the filter. Furthermore, the premature precipitation of the intermetallic near the inner wall of the filter improved the capacity of the Al2O3 CFF to remove metallic impurities; the coarse filter walls acted as nucleation sites. After purification at 700 °C and a gravity coefficient of 80 with an Al2O3 CFF of P = 130 ppi and H = 20 mm, no Al2O3 particles were observed in the filtered aluminum, the removal ratio of Fe (RFe) reached 76%, and the loss percentage of Si (LSi) was 55%. Based on the optimized conditions obtained from the exploratory experiment, a continuous purification was further performed to complete the engineering scale purification of primary aluminum and obtain purified aluminum without Al2O3 particles, with 74% for RFe and 50% for LSi.