Sustainable Mining and Metallurgy

An enterprise uses the side wall directional solidification segregation method to produce refined aluminum, and the content of zinc and vanadium impurities cannot meet the requirements of the industry standard 3N5 refined aluminum. In this paper, through theoretical analysis of the equilibrium distribution coefficient of each impurity element in primary aluminum and combined with the actual production, it can be seen that the reason why zinc impurities cannot meet the requirements is that the content of zinc impurities in primary aluminum is high, and the equilibrium distribution coefficient of zinc in aluminum is relatively large, and the removal efficiency is low. The reason why vanadium impurities cannot meet the requirements is that the equilibrium distribution coefficient of vanadium in aluminum is 5.1, which is larger than 1 and cannot be purified by segregation method. Therefore, according to the impurity control requirements of refined aluminum and the purification and impurity removal efficiency, the control requirements of each impurity component in the alumina were calculated, and put forward the measures to adopt high-grade and high-quality raw materials; in order to solve the problem that vanadium cannot be removed by segregation method, borax and strontium chloride were used to remove vanadium. Finally, the directional solidification segregation method was successfully applied to produce qualified refined aluminum products.