Molten aluminum refining device and molten aluminum refining technology

Abstract

The invention provides a molten aluminum refining device and a molten aluminum refining technology, and relates to the technical field of molten aluminum casting. The molten aluminum refining device comprises two brackets, a ladle, a liquid discharging control device, a stirring device and a powder spraying device used for spraying inert gases and a refining agent into the ladle. A liquid discharging opening used for communicating with a smelting furnace is formed in the ladle, and the liquid discharging control device is installed at the position, close to the liquid discharging opening, of the outer wall of the ladle, and is used for opening or closing the liquid discharging opening. The stirring device comprises a rotating shaft which is used for extending into a holding cavity to stir molten aluminum, and the rotating shaft is internally provided with a gas and powder passage penetrating through the two ends of the rotating shaft. The molten aluminum refining device can refine the molten aluminum before smelting is conducted, meanwhile, the effects of dealkalizing, deslagging and degassing are achieved, the purpose of improving the quality of the molten aluminum is achieved, the refined molten aluminum can directly flow into the smelting furnace from the liquid discharging opening to be refined, and does not need smelting in the smelting furnace, and the problems that the time and labor are wasted because the smelting furnace needs cleaning regularly and the quality of the molten aluminum is low are overcome.

Description

technical field [0001] The invention relates to the technical field of molten aluminum melting and casting, in particular to a molten aluminum refining equipment and a molten aluminum refining process. Background technique [0002] At present, the melting and casting of aluminum and aluminum alloys uses electrolytic aluminum liquid (or aluminum ingots), returned scraps, and intermediate alloys as the main raw materials, and forms products with different shapes after melting, heat preservation, refining, and casting, such as flat ingots, round ingots, Cast and rolled coils, etc. Its main process is smelting, melt treatment and casting. These three aspects all involve the treatment of liquid aluminum and aluminum alloys in four aspects: alloying, homogenization of temperature and composition, purification and refinement. Therefore, from a technical point of view, the key point or core of melting and casting is how to solve the above four aspects of molten metal and aluminum ...

AI Technical Summary

Problems solved by technology

[0003] The technology currently used is usually to pour the electrolytic aluminum liquid into the smelting furnace and then refine it. This method has the following disadvantages, such as: 1), for the smelting furnace with a large molten pool, it is necessary to stir the aluminum liquid in the entire molten pool Refining treatment, due to the large area, more aluminum liquid, there is inhomogeneity; 2), multiple refining agent additions, stirring and slag removal and other processes are more manual operations, human factors have a great influence, and there is instability and uncontrollable 3), frequent opening and closing of the furnace door during operation will lead to increased loss of aluminum solution and furnace temperature, increasing energy consumption; 4), slag generated during the refining process in the smelting furnace is easy to deposit and condense on the furnace wall and furnace bottom , due to the large amount of slag in the electrolytic aluminum liquid, the smelting furnace needs to be cleaned thoroughly after a period of use to ensure the capacity of the furnace and the purity of the aluminum liquid. The lining of the furnace is damaged, which intensifies the waste of energy in the process of heating up the furnace again; 5), due to the large drop in the temperature of the aluminum liquid in the online refining process, in order to ensure the casting temperature, the temperature of the holding furnace needs to be increased relatively, but in this way That is to say, the energy consumption is increased, and the internal structure of the molten aluminum is difficult to control; 6), the slag generated during online refining is difficult to clean during the use of the equipment, and other factors also restrict the improvement of product quality

Moreover, there is currently a lack of refining equipment in the existing market that can separately refine aluminum liquid before smelting to achieve the effects of alkali removal, slag removal, and gas removal at the same time

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