Taking　into　account　the　thermodynamic　and　kinetic　conditions　of　impurity　removal　and　purification,　three　impurity　removal　and　purification　fluxes　were　designed　for　comparative　experiments.　It　was　found　that　the　impurity　and　hydrogen　removal　rates　of　experimental　flux　II　were　the　best,　with　a　decrease　of　28.1%　in　micro　grain　size　28.1　μ　m.　The　spacing　between　secondary　dendrites　is　significantly　reduced.　The　eutectic　silicon　phase　of　the　alloy　treated　with　experimental　flux　II　is　granular,　with　small　and　dispersed　inclusions.　The　fracture　structure　of　the　alloy　exhibits　ductile　fracture　characteristics,　mainly　in　the　form　of　transgranular　microporous　aggregation,　which　helps　to　improve　the　plasticity　and　fatigue　resistance　of　the　alloy.　The　flux　purification　method,　which　focuses　on　impurity　removal,　can　provide　a　reference　for　the　actual　impurity　removal　in　aluminum　alloy　smelting.　©　Published　under　licence　by　IOP　Publishing　Ltd.