摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for removing Fe as an impurity without contaminating molten Al or molten Al alloy by using additive elements in the above compound method excellent in productivity and minimal in energy consumption. SOLUTION: This method is a method for removing Fe from molten Al prepared by melting Al or Al alloy scrap containing Fe. In this method, a multiple compound containing Fe is formed by adding Zr and Mn to the molten Al so that Zr/Mn (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 Zr and Mn is 0.5-2 times, by mass ratio, the content of Fe in the molten metal, and further, it is recommended that the molten Al to which Zr and Mn 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.</p> |