Method for producing ultra-wide and ultra-thin cast-rolled aluminium foil blanks by directly cast-rolling blanks with electrolytic aluminium liquid

Abstract

The invention discloses a method for producing ultra-wide and ultra-thin cast-rolled aluminium foil blanks by directly cast-rolling blanks with electrolytic aluminium liquid. The method comprises the following steps: firstly melting raw materials; carrying out electromagnetic stirring 2-3 times after all the solid materials are molten; spraying carbon tetrachloride into the melt for refining by using argon as a carrier when the temperature of the aluminium liquid in the furnace reaches 740-760 DEG C; controlling the height of the surged waves during refining to be 50-100 mm and the amount of carbon tetrachloride to be 1.8-2.4 kilograms / ton of aluminium; after remaining aluminium liquid refining for 10-30 minutes for slagging off, adding solid aluminium ingots or intermediate alloys or waste materials for adjustment according to the requirements of alloy grades, and carrying out refining and slagging off again within 25-35 minutes after composition adjustment; controlling the temperature of the aluminium liquid to be 750-760 DEG C during conversion; carrying out standing; carrying out filtration; carrying out online dehydrogenation; carrying out re-filtration; and carrying out grain refinement and cast-rolling. By adopting the method, the whole production process of the aluminium foil is greatly shortened, and the energy consumption of the unit product is reduced.

Description

technical field [0001] The invention relates to a method for producing aluminum foil blanks by direct casting and rolling of electrolytic aluminum liquid, especially a process for producing ultra-wide and ultra-thin aluminum foil (aluminum foil with a width greater than 1800mm and a thickness less than 0.0065mm). Background technique [0002] At present, high-quality aluminum foil blanks are generally produced by hot rolling billeting or aluminum ingot remelting casting and rolling. Both of these methods require production processes such as remelting, ingot casting, face milling, and hot rolling. There are disadvantages such as long process flow, high energy consumption and low production efficiency, and certain inclusions, micro-bubbles and component segregation generally exist in the aluminum foil produced by this method, which seriously affects the quality of aluminum foil cast and rolled in subsequent production. [0003] The production of aluminum sheet, strip and fo...

AI Technical Summary

Problems solved by technology

However, because the casting and rolling products cannot be milled, the surface quality of the casting and rolling foil billet is poor, and the temperature of the electrolytic aluminum liquid is high, the high temperature of the melt is poor, the gas content is high, and the impurity content is high. The cooling intensity and cooling gradient of casting and rolling are large, and it is easy to cause the aluminum foil billet produced by casting and rolling to have structure, uneven composition, and coarse crystal phase, which brings considerable problems to the direct casting and rolling of electrolytic aluminum liquid to produce high-grade wide-width double-zero aluminum foil casting and rolling billets. Due to the difficulty of using electrolytic aluminum liquid direct casting and rolling method to produce ultra-wide and ultra-thin double-zero aluminum foil casting and rolling blanks in my country

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