Removal of Low-Content Impurities from Al By Super-Gravity

Super-gravity segregation was investigated to enrich and remove the low-content impurities from Al by solidifying Al under a super-gravity field. The macrosegregations of Fe (0.19 wt pct) and Si (0.09 wt pct) were remarkable within 1.5 cm along the direction of super gravity, and the concentration ratios between two sides under super gravity of 1000 g reached 4.05 and 2.80, respectively. The microstructures demonstrated that Fe-and Si-rich phases formed and gathered at the bottom along the direction of super-gravity field.