Microalloy smelting process for aluminum-magnesium-silicon aluminum alloy

The invention discloses a microalloy smelting process for an aluminum-magnesium-silicon aluminum alloy, and belongs to the field of aluminum product processing. Electrolytic aluminum liquid and industrial silicon are prepared into a AlSi12 liquid intermediate alloy in an intermediate frequency furnace, the liquid intermediate alloy is utilized to scour a magnesium ingot in a special runner, and the mixed aluminum liquid is diluted in a smelting furnace to form an aluminum-magnesium-silicon aluminum alloy melt with good alloying effect. The process can replace a silicon addition method for adding industrial silicon, rapid dissolution silicon or an aluminum-silicon intermediate alloy and a magnesium addition method for stirring or pressing the magnesium ingot into the smelting furnace, which are commonly used at present, is favorable for full dissolution, diffusion and absorption of Mg and Si elements, and facilitates formation and uniform distribution of a Mg2Si strengthening phase so as to improve the quality and processability of extrusion ingot products.