Over the past years, the demand for high-purity aluminium has increased in many sectors, like the aerospace and automotive sectors. This is because aluminium has excellent corrosion resistance and a high strength-to-weight ratio. To cope with this significant increase in demand, the production of primary aluminium has increased since the refining processes of secondary aluminium are limited by high impurities, mainly iron. The iron-rich intermetallic compounds (β-Fe phase) in Al-Si aluminium alloy negatively affect the mechanical properties of the aluminium from its sharp-edged coarse plate structure. In order to mitigate this problem and reduce the iron content in the melt, one way is to add Fe-bearing intermetallic particle formers, like Cr, Mn and Sr. This paper aims to investigate the influence of different Mn additions forlow Fe composition aluminium melt at a constant cooling rate. Specifically, the impact of usingfilters, the Fe removal efficiency for different Mn additions, and the Fe-bearing intermetallic particle’s Fe removal potential. This was done by running small-scale experiments with 8kg/experiment of Al-10Si-0.5Fe (wt%) alloy. The main parameter that varied was the amount of Fe-bearing intermetallic particle formers added to the melt. This report concludes that the Fe-bearing intermetallic parties have mostly sedimented from the top surface of the melt since the composition of the filtered and unfiltered samples were similar. Additionally, larger amounts of Mn are required to improve the Fe removal efficiency for low Fe concentration melt since it improves the Fe removal potential and increases both the size and amount of Fe-bearing intermetallic particles in the melt.
Oral session.