Study of the stain on primary aluminium (3rd Report)

Study on behaviour of alumina in primary molten aluminium, and the effect of fluxing treatment for impurities in molten aluminium

Abstract

Al₂O₃ contained in primary aluminium ingot was already discussed in the previous report. This paper is to report on Al₂O₃ contained in molten metal immediately after tapped out from reduction cell, and also on the effect of fluxing treatment on the impurities contained in aluminium, such as Si, Na, Mg, Zn and B.
In this examination, 99.99% purity aluminium was used as the base metal and Na₃AlF₆, NaF, NaCl, Na₂CO₃, fused salt of Na₃AlF₆ NaCl, -Na₂CO₃, NaBF₄, Na₂SiF₆, ZnCl₂ and MgCl₂ as fluxes.In addition, the effect of Na₂SiO₃ is also discussed in this paper.