The influences of impurity contents

Si and Fe

in the raw materials of electrolytic aluminum production such as aluminum oxide

aluminum fluoride

anode covering material and carbon anode on the liquid aluminum quality were investigated.By tracking the migration

transformation and accumulation of impurity elements

the contribution values of the four raw materials for the Si and Fe contents in liquid aluminum were calculated.The results reveal that these four kinds of raw materials can cause the increase of Si and Fe in liquid aluminum

and the maximum values reach 55.67% and 62.15%

respectively.The largest source of impurity elements comes from the alumina with fluoride

followed by anode covered material

carbon anode and aluminium fluoride.To improve the quality of liquid aluminum

several control strategies were presented

such as controlling the quality of raw materials

purifying the anode covered material

enhancing the quality of carbon anode

optimizing the processing parameters of electrolytic production.