Preparation method of refining agent for smelting fly ash doped aluminum alloy

The invention discloses a preparation method of a refining agent for smelting a fly ash doped aluminum alloy. The refining agent is prepared from the following raw materials in parts by weight: 6-8 parts of potassium chloride, 4-6 parts of tree ash, 6-8 parts of slag, 7-9 parts of mountain flour, 6-8 parts of zinc oxide, 3-5 parts of calcium fluoride, 3-5 parts of sodium nitrate, 5-8 parts of slag, 8-10 parts of sodium fluosilicate, 3-5 parts of sodium sulfate, 5-8 parts of aluminum chloride, 3-5 parts of potassium carbonate, 8-10 parts of sepiolite, 5-8 parts of NaBF4, 3-5 parts of sodium chloride, 5-8 parts of calcium carbonate, 8-10 parts of Na2TiF68 and 5-8 parts of NaF. The refining agent disclosed by the invention is used for treating to obtain a high-quality molten aluminum alloy; the molten aluminum alloy can be used for casting production and the rate of finished products is obviously improved; particularly, the porosity in a cast is reduced by 1-2 degrees and is effectively controlled; pores are not formed on the surface of the cast, oxide inclusion is obviously reduced and the oxide inclusion is about grade 2; and the mechanical property of the cast is obviously improved.