Efficient magnesium-containing aluminum alloy refining and slagging dual-purpose flux and preparation method thereof

Abstract

The invention relates to an efficient magnesium-containing aluminum alloy refining and slagging dual-purpose flux and a preparation method thereof, and belongs to the field of alloy smelting. The fluxcomprises the following components of, in percentage by weight, 30%-55% of magnesium chloride, 10%-45% of potassium chloride, 1%-5% of potassium feldspar, 0%-20% of calcium fluoride and 2%-10% of potassium fluoroaluminate. The flux preparation process comprises the following steps of (1), fully mixing magnesium chloride, potassium chloride, potassium fluoroaluminate, calcium fluoride and other salts which are dried at 240-300 DEG C for 3-5 hours, melting in a resistance furnace, heating to 650-750 DEG C, keeping the temperature, and stirring for 10-30 minutes to obtain a uniform salt melt; (2), pouring the salt melt into a mold for cooling, and solidifying into a blocky flux; and (3), crushing the blocky flux into particles with the average particle size of about 0.5 cm, and fully mixingthe particles with dry potassium feldspar to obtain the magnesium-containing aluminum alloy melt refining and slagging flux. The magnesium-containing aluminum alloy flux does not contain sodium salt,has refining and slagging effects, and is an ideal flux for magnesium-containing aluminum alloy.

Description

technical field [0001] The invention relates to a high-efficiency magnesium-containing aluminum alloy refining and slagging dual-purpose flux and a preparation method thereof, belonging to the field of alloy smelting. Background technique [0002] During the smelting and casting process of aluminum alloy, there are obvious phenomena such as hydrogen absorption and formation of oxidized slag inclusions, which lead to a decrease in melt fluidity, formation of pores, shrinkage porosity, cracks and other defects, and lower alloy casting and mechanical properties. Therefore, improving the purity of the melt has become one of the keys to producing high-quality aluminum alloys. At present, the method of adding flux to the alloy melt is widely used in industrial production to achieve the purpose of preliminary dehydrogenation and degassing. Usually the flux composition is mainly to add a small amount of fluorine salt (such as: NaCl) on the basis of chlorine salt (such as: KCl, NaCl...

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Problems solved by technology

Usually the flux composition is mainly to add a small amount of fluorine salt (such as: NaCl) on the basis of chlorine salt (such as: KCl, NaCl, accounting for about 80wt%) 3 AlF 6 , NaF, CaF 2 etc.), contains a large amount of sodium salt, which is easy to cause sodium embrittlement of magnesium-containing aluminum alloys, and the slag-liquid separation performance is not good, and the aluminum content in the scum is relatively high