Abstract: Comparing with the old technique and equipments of Al purification, combined with solidification characteristic of pure Al, a new-style purification furnace and corresponding technology is developed. Double induction coils heating mode is adopted and a higher and adjustable thermal gradient above solid and liquid interface is obtained. The growth velocity is controlled automatically by computer and the morphology of HPA crystal is stable cellular or single crystal. The results of concentration analysis show that, the purity of the ingots fabricated by this furnace can reach 99.999 3%, and there is a reasonable axial distribution of impurities.

Key words: Crystal, Directional solidification, High purity aluminum Purification equipment