| For the purpose of Fe removal in the aluminum and silumin melt containing Fe, multicomponent intermetallic compounds which were formed and precipitated were produced by the absorption filtration experiment. Four types of aluminum sample were made by use of 99.99wt.% aluminum, 12.5-50wt.%Fe ferro-aluminum, 10-20wt.% Mn-Al alloy, 25wt.%Si-Al alloy and 99.99wt.% zinc ball. They were Al-1-5wt.%Fe, Al-3wt.%Fe-2-6wt.%Mn, Al-3wt.%Fe-5wt.%Mn-1.5-7.5wt.%Zn, Al-0.6-4wt.%Fe-12.5wt%Si-1.3-4wt.%Mn. In the heating absorption filtration tower at 670℃ which is cylindrical graphite tube filled with alumina ball or cokes chip, the aluminum or silumin sample melts were made by the absorption filtration experiment. And the results are as follows. 1. Filtered Aluminum alloy having initial Fe concentration under 1.6wt.%Fe had no filtration effect. but avove that had the iron concentration about 1.6t.% that is hypoeutectic region. 2. Filtration of aluminum alloy sample containing both Fe and Mn showed the iron concentration under 0.4wt.%, when the Mn/Fe ration was 4/3. 3. Filtration of aluminum alloy sample containing Fe, Mn and Zn was same as Al-Fe-Mn system. The remaining amount of Mn was also the same. 4. The filtration efficiency of aluminum alloy sample containing only Fe was under 60%. This was probably contributed from the small size of formed intermetallic compound. The filtration efficiency of sample having Fe and Mn was between 70 and 80%. The Zn addition did not have an effect on the filtering efficiency of Fe. 5. The filtration effect of Silumin sample containing Fe was larger than the other cases. Using the alumina ball filter tower, the filtered mass showed. 0.29-0.34wt.%Fe, 0.17-0.33wt.%Mn, and using the cake chip filter tower, showed 0.27-0.35wt.%Fe. 0.17-0.33wt.%Mn. |
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