A method for separating iron from an aluminium alloy comprises providing a first zone of an aluminium alloy at a first temperature at which the aluminium alloy is partially melted and any iron-containing particles therein are fully molten, and providing a second zone of the alloy at a second temperature at which the aluminium alloy is fully molten, such that a temperature gradient is created between the first zone and the second zone. By applying a static homogeneous magnetic field to the alloy, and maintaining the temperature gradient and the magnetic field for a period of time, the iron content of the first and/or second zone can be reduced.
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