Abstract:The effects of segregation velocity and rotation velocity on the purification of high purity aluminum and the distribution characteristics of impurity elements on the segregation ingot were studied by using a self-developed rotary segregation equipment for high purity aluminum and an element glow-discharge mass spectrometer (GDMS) combined with the interface stability theory. The results showed that the critical growth rate of crystal with flat interface was less than 52 mm/h. With the increase of segregation rate, the concentration of impurity elements in the crystal increased significantly, and the purification rate decreased significantly. With the increase of segregation rate, the original stable diffusion state was destroyed, and the separation ability of impurity elements was changed. With the increase of rotation speed, the concentration of impurity elements in the crystal was significantly reduced, and the purification rate was significantly increased. The rotation segregation could effectively improve the melt temperature gradient, reduce the effective partition coefficient (Ke), and improve the crystal purification effect. Impurity contents of K0<1 gradually increased from the center to the surface of the ingot, but impurity contents of K0>1 were just the opposite. The concentration range of impurity elements showed the best uniformity at the bottom of the ingot.