Abstract
Recently, a new refining method, which depends chiefly upon the partial melting of impure aluminium, has been introduced by one of the present writers. (I. Obinata; Jour. Min. Inst. Japan, 53, (1937), 542. Jap. Pat. No 124398) In this method, the vessel containing the molten aluminium is rotated about a vertical axis and cooled down until the primary crystals of. impurities, FeAl3 in particular, are separated from the eutectic mother-liquor by the action of centrifugal forces. In the present paper, aluminiums containing one or more elements, Fe, Si, Ti, Cu, Mg, Zn and Sb as impurities have been subjected for refining under various rates. From the chemical analysis of the results obtained, the follwing conclusions have been drawn; While the elimination of iron and titanium is easy, that of silicon is difficult unless it exists as a ternary compound, FeAl3 FeSi2; If aluminium contains a large amount of magnesium or zinc as impurity, the content of iron in the refined parts can be lowered below 0.8%.
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