Method for preparing 5182 big flat ingot with high performance by short flow process

Abstract

The invention relates to a method for preparing a 5182 big flat ingot with high performance by a short flow process. The big flat ingot is prepared from a part of electrolytic aluminum liquid which replaces an electrolytic re-melting aluminum ingot, wherein the electrolytic aluminum liquid accounts for 40-70% of the raw material, and the balance is solid materials, such as secondary waste materials of the electrolytic re-melting aluminum ingot, an intermediate alloy or related alloy. is the method comprises the steps of: raw material charging sequence: firstly adding the solid materials; fused mass refining: pre-treating the aluminum fused mass by using a deslagging agent without Na powder and then spray-refining for 15-45 min by using N2-C12 mixed gas and a small amount of powder refining agent in the aluminum liquid; and online fused mass treatment: degassing by using Ar gas on a rotating degassing device, such as a DDF or a Mint and the like, tubular filtering and ceramic plate double filtering, and continuously online feeding Al-Ti-B or Al-Ti-C wire. The flat ingot is a cuboid or a similar cuboid with the length not less than 2,000 mm, the width not less than 1,000 mm and the thickness not less than 300 mm. The method has the advantages of shorter process flow, lower production cost, environmental protection and energy saving, and the like.

Description

technical field [0001] The invention relates to the field of smelting and casting of new non-ferrous metal materials, and is aimed at a process flow and a preparation method of directly casting a high-performance large slab of 5182 aluminum alloy by using electrolytic aluminum liquid. Background technique [0002] 5182 belongs to the Al-Mg series alloy. Because the alloy has good strength, elongation and deep drawing performance, the requirements for 5182 alloy slabs for easy-open can lids are higher. The traditional production process of the alloy slab is as follows: 1 Electrolytic aluminum liquid——2 Refining—3 Casting into remelted aluminum ingot—4 Secondary melting—5 Refining—6 On-line processing—7 Casting into slab - 8 Subsequent processing and handling. The technological process is relatively mature, and its advantage is that the product quality is relatively stable; its disadvantage is that there are many processes, long production cycle and high cost. If the 2 to 4 ...

AI Technical Summary

Problems solved by technology

[0004] ①The molten aluminum melt temperature is high, the effective nucleation rate is low, and it is easy to cause the slab grains to be coarse;

[0007] ④Add Na during electrolysis 3 AlF 6 Mediums such as NaF and NaF contain a large amount of Na, and the activity of Na+ is higher than that of Al+, so that the Na content in the aluminum liquid is as high as 0.002-0.006%, which is about 10 times higher than the normal requirement, which brings great technology to the removal of Na. difficulty

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