Deironing method for secondary aluminum

Abstract

The invention relates to a deironing method for secondary aluminum. The deironing method is characterized by comprising the following steps of (1) preheating 50-70% Al-B intermediate alloy and 30-50% Al-Mn intermediate alloy for 30-60 minutes at 150-250 DEG C, wherein the intermediate alloys account for 0.5-2% of mass of aluminum-silicon secondary aluminum; (2) maintaining the temperature for 10-30 minutes after heating the aluminum-silicon secondary aluminum to 400 DEG C; and raising the temperature to 700 DEG C; (3) after the aluminum-silicon secondary aluminum is melted, adding the intermediate alloys, slowly stirring, and standing for 0.5-4 hours after the intermediate alloys are melted; (4) dusting casting, fixing a mold on a vibration platform, and casting and cooling under the condition of mechanical vibration, wherein the frequency of the vibration platform is 10-40 Hz and the amplitude of the vibration platform is 5-10 cm. The deironing method is used for removing iron, refining grains and improving the shape of an iron-rich phase, can reduce the iron content of the secondary aluminum and improve the extension strength and rate of the secondary aluminum and is suitable for the aluminum-silicon secondary aluminum.

Description

technical field [0001] The invention relates to a method for purifying recycled aluminum melt, in particular to a method for removing iron from recycled aluminum. Background technique [0002] Aluminum alloy is widely used in various industries of the national economy because of its excellent performance. Among the metal materials used by humans, the consumption of aluminum ranks second, second only to steel. my country is the world's largest aluminum producer, with an output of 21 million tons in 2012, accounting for 40% of the world's total. However, my country's bauxite resources are not rich, and the reserves account for about 3% of the world's reserves, which is only enough for 20 years of mining. The contradiction between the shortage of aluminum resources and the increasing production of primary aluminum has become increasingly prominent. [0003] Recycled aluminum is an aluminum alloy or aluminum metal obtained by re-melting and refining waste aluminum and aluminu...

AI Technical Summary

Problems solved by technology

The absorption rate of manganese chloride added in CN102304649A is lower than 60%, which is not conducive to the effective utilization of resources

In addition, none of the above patents mentioned the mechanical properties of recycled aluminum after iron removal, especially the plasticity index

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