Iron Removal Of Secondary Aluminum

Iron removal has been a global problem that hinders the development of secondary aluminum. It is crucial to the expansion of raw material application and improvement of production quality in secondary aluminum industry.In this paper, two kinds of flux have been designed to remove iron. Besides, the precipitation and sediment of AlFeMnSi phase has been studied.The first kind is flux with borax in. With regard to Al00 alloy, the reduction of CFe came to the dramatic when adding 0.9wt% borax. And CFe increasingly reduces with the extension of time; it achieved the lowest, 0.0779wt% after 60min. As to ADC12 alloy, iron removal ratio reached 48.08% when adding 0.5wt% borax after 60min. CFe has been reduced at 30min's reaction, but it is not as significant as 60min's reaction. And CFe did not change after 60min.Another kind is flux with MnCl₂ in. Nominal Mn/Fe ratio affects the absorption of MnCl₂ and iron removal ratio most which was demonstrated by orthogonal experiment. The best iron removal scheme is that reaction at 2.84 nominal Mn/Fe ratio after 10min at 600℃.When it comes to the precipitation and sediment of AlFeMnSi phase, it is found that the stoichiometry of the quaternary phaseα-Al(Fe,Mn)Si is Al16FeMn3Si3. It is also found that the fusion temperature of ADC12 alloy is 535.273℃⁶31.878℃. There are two typical phase precipitation temperature, around 569℃and 553℃, corresponds toα-Al(Fe, Mn)Si precipitaion and eutectic reaction respectively. When Mn/Fe ratio achieved 1.5, there's only one temperature 551.083℃regards to eutectic reaction which was lowered by adding Mn. Mean while, CFe of sediment sample's top and bottom differenced by 1.566%, which showed that sedimentation of iron reached the best with Mn/Fe ratio at 1.5.