A compound purification process for degassing and slag removal in molten aluminum smelting

Abstract

The invention relates to a degassing and deslagging compound purification process for molten aluminum smelting. The degassing and deslagging compound purification process comprises degassing and deslagging of molten aluminum in a furnace as well as degassing and deslagging of molten aluminum in a pouring process outside the furnace; degassing and deslagging of molten aluminum in the furnace comprises the following steps: (1), adding an efficient active non-toxic refining agent in the molten aluminum in the furnace; (2), with nitrogen as a carrier in the furnace, blowing the refining agent into a melt; the degassing and deslagging of refined molten aluminum outside the furnace comprises the followings: (1), introducing nitrogen to the bottom of a molten aluminum filtering chute outside a furnace outlet, and leading the nitrogen in the filtering chute through air bricks vertically mounted at the bottom of the filtering chute; (2), enabling the molten aluminum to flow to a watering pot position and arranging a vertical second-stage filtering plate at the watering pot position. According to the process, the efficient active refining agent is added in the furnace, nitrogen is introduced and used as carrier, the refining agent is blown to the bottom of the molten aluminum and molten into droplets for adsorbing slag inclusion and in the process, hydrogen is diffused to bubbles constantly, so that the purpose of purifying molten aluminum is realized.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal melting and casting, and relates to a liquid aluminum degassing and slag removal technology, in particular to a composite purification process for degassing and slag removal inside and outside a molten aluminum melting furnace. Background technique [0002] Aluminum alloys are prone to air inhalation and slag inclusions during smelting and production. Air inhalation will cause pores and looseness in the product, thereby reducing the density of the product; slag inclusions will increase the hardness and affect the quality of subsequent processed products. , or damage the processing equipment. We know that there is no aluminum alloy melt with high purity, no matter how good the effect of metamorphism and grain refinement in the smelting process is, no matter how complete the production process and heat treatment process are, once the defects exist from the beginning, it will be difficult to eliminat...

AI Technical Summary

Problems solved by technology

[0002] Aluminum alloys are prone to air inhalation and slag inclusions during smelting and production. Air inhalation will cause pores and looseness in the product, thereby reducing the density of the product; slag inclusions will increase the hardness and affect the quality of subsequent processed products. , or damage the processing equipment

We know that there is no aluminum alloy melt with high purity, no matter how good the effect of metamorphism and grain refinement in the smelting process is, no matter how complete the production process and heat treatment process are, once the defects exist from the beginning, it will be difficult to eliminate , so it is difficult to produce high-quality products

Such as the Chinese authorized patent document (name: a purification technology in a molten aluminum melting furnace, announcement number: CN103255304), this patent is only applicable to the purification of the melt in the melting furnace, and when the melt is outside the melting furnace, there is no purification, so that The solution is polluted again, sucking air, and generating slag inclusions. The existing problems are exactly the technical problems that need to be solved in the application of the present invention

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