To provide a method for removing Mn as impurity without contaminating molten Al or molten Al alloy by using additive elements in the compound method excellent in productivity and minimal in energy consumption.
This method is a method for removing Mn from the molten Al prepared by melting Al or Al alloy scrap containing Mn. In this method, an Mn-containing multiple compound is formed by adding Cr and V to the molten Al so that Cr/V (mass ratio) becomes 0.5-1.5, and this multiple compound is separated and removed. Moreover, it is preferable that the total additive quantity of Cr and V is 0.5-2 times, by mass ratio, the content of Mn in the molten metal, and further, it is recommended that the molten Al to which Cr and V are added is held for prescribed time at a temp. not lower than the temp. at which the flowability of the molten Al is satisfactory and not higher than the melting temp. of the multiple compound.
KUNII KAZUTAKA
OSUMI KENJI
MASUDA RYUHEI
