The invention belongs to the field of
metal materials, and relates to a refining method for an aluminum-
silicon cast aluminum
alloy. An aluminum
alloy ingot raw material comprises the following elements in percentage by
mass: 10.5-11.5% of Si, 0.3-0.5% of Mn, 0.2-0.3% of Mg, 0.3-0.6% of Fe, less than or equal to 3.5% of Cu, less than or equal to 0.9% of Zn, less than or equal to 0.3% of Sn, 0.2-0.5% of Ni and the balance of Al. Dried
alum is sent into molten aluminum together with an
inert gas by a spray gun, wherein the
alum addition rate is 1-10%kg / t in Al, the
inert gas is injected into themolten aluminum through a
graphite rotor, and the bubble
diameter of the prepared molten aluminum is less than 1mm. An aluminum
alloy ingot obtained by refining the molten aluminum by the refining method for
casting an aluminum alloy material, provided by the invention, has a
hydrogen content of less than 0.25cc in 100g of Al and an
impurity content of less than 200ppm in 100g of Al.