Basic Physical Properties of Aluminum Alloys and Their Electrolyte Systems Prepared by Molten Salt Electrolysis Using Black Aluminum Dross as Raw Material

The density and surface tension of the proposed molten salt system of different components Na3AlF6-AlF3-CaF2-BAD were measured by Archimedes and separation methods at 940–980°C. The dissolution rate of black aluminum dross (BAD) and aluminum oxide in the electrolyte after denitrification was compared. The aluminum alloy was prepared from BAD raw materials, and the influence of BAD content on alloy composition was studied. The results showed that the electrolyte system density and surface tension exhibited a downward trend with increasing temperature, aluminum fluoride content, and BAD content. Other impurity elements in BAD had only limited influence on the density and surface tension of the electrolyte system. The dissolution rate of denitrified BAD in the electrolyte was slightly greater than that of alumina. The content of each metal element in the aluminum alloy increased with increasing proportion of BAD.