Method for refining grains in aluminum alloy smelting process

Abstract

The invention relates to a method for refining grains in an aluminum alloy smelting process. The method comprises that a cold material with a smelting furnace tonnage of 20-40% is added into a smelting furnace, and then an electrolytic aluminum liquid with a smelting furnace tonnage of 55-75% and a temperature of not lower than 850 DEG C is added; after the electrolytic aluminum liquid is added, the liquid level is not stirred, the temperature is not increased, and when the temperature is reduced to less than 660 DEG C and a semi-solidified state is achieved, the temperature is increased again; when the temperature is increased to 740-760 DEG C, the chemical components of an alloy liquid are adjusted by adding an intermediate alloy and a metal element, wherein the intermediate alloy and the metal element are refined in a gas strengthening body manner in a refining tank filled with nitrogen or argon to obtain a refining agent, the refining agent is sprayed into the electrolytic aluminumliquid, the electrolytic aluminum liquid is continuously refined for 20-30 min, and the dross on the surface of the aluminum liquid is scraped out after refining is completed; and finally the aluminum alloy is obtained through continuous casting. The method is simple in process, good in grain refinement effect and stable in product quality.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy smelting production, in particular to a method for refining crystal grains in the process of producing aluminum alloy by electrolytic aluminum liquid. Background technique [0002] In the production process of aluminum alloy, the size of the grain size and the degree of refinement of the grain have a great influence on the subsequent processing of the aluminum alloy. The finer the grain, the better the performance of the subsequent processed aluminum alloy products. . The traditional grain refinement method is to add grain refiners, such as titanium, strontium aluminum titanium boron wire and rare earth, in the melting process or casting process when aluminum ingots are heated and melted to produce aluminum alloys or electrolytic aluminum is used to produce aluminum alloys. If some grain refiners are used, the degree of grain refinement will be poor and uneven, especially in the process of...

AI Technical Summary

Problems solved by technology

The traditional grain refinement method is to add grain refiners, such as titanium, strontium aluminum titanium boron wire and rare earth, in the melting process or casting process when aluminum ingots are heated and melted to produce aluminum alloys or electrolytic aluminum is used to produce aluminum alloys. If some grain refiners are used, the degree of grain refinement will be poor and uneven, especially in the process of using electrolytic aluminum to produce aluminum alloys, the process temperature is high, resulting in over-burning of the melt, and in the subsequent production The effect of grain refinement in the process is not obvious, and more refiners need to be added, which will cause some trace elements to exceed the standard and produce some unqualified products