Process method for preparing high-purity aluminum from electrolytic aluminum by adopting vacuum distillation

The invention relates to a process method for preparing high-purity aluminum from electrolytic aluminum by adopting vacuum distillation, and provides a process method for preparing the high-purity aluminum by carrying out vacuum distillation on electrolytic aluminum melt in a vacuum distillation furnace. The process method comprises the vacuum distillation step 1 and the vacuum distillation step 2; in the vacuum distillation step 1, the electrolytic aluminum melt is continuously input into the vacuum distillation furnace for vacuum evaporation under vacuum degree 1 and temperature 1, volatile impurity elements including Na, Mg, Zn and Ca are continuously condensed in condensation chambers of different temperatures of a condenser, and residual Al-rich melt is collected; and in the vacuum distillation step 2, the Al-rich melt is continuously input into the vacuum distillation furnace for vacuum distillation under vacuum degree 2 and temperature 2, Al and micro less-volatile impurity elements such as Cu and Ga i