Molten aluminum refining method

Abstract

The invention belongs to the technical field of metal refining methods, and discloses a molten aluminum refining method. The molten aluminum refining method comprises the following steps: (S1) charging: a charging port is formed in the external of a smelting furnace for charging; (S2) melting and feeding: solid aluminum raw materials are conveyed to the smelting furnace by a pipe after being molten in the charging port; (S3) heating by the smelting furnace: the smelting furnace is heated for further heating molten aluminum inside; (S4) refining by the smelting furnace: air bricks are mounted under the smelting furnace for introducing refining gas to the bottom of the smelting furnace; and (S5) after refining by the smelting furnace, 20-90% of the molten aluminum in parts by mass in the smelting furnace is poured in an insulation furnace to switch to next procedures. Compared with the prior art, the molten aluminum refining method achieves the following technical effects: 1) the continuous refining is realized; 2) the refining gas is conveyed through the air bricks, so that bubbles are smaller, more uniform and stable without causing rolling of the molten aluminum, the burning lossis greatly reduced, and the refining effect is improved; 3) manual operation is changed to automatic operation; and 4) intermittent operation is changed to continuous operation.

Description

【Technical field】 [0001] The invention relates to the technical field of metal refining methods, in particular to a method for refining molten aluminum. 【Background technique】 [0002] In the smelting process of molten aluminum, the molten aluminum needs to be refined, degassed and slag removed to obtain relatively pure molten aluminum. The molten aluminum refining method in the related art is as follows: [0003] S1, feeding: [0004] Open the furnace door and add solid aluminum raw materials (waste aluminum, aluminum rods, aluminum ingots, etc.) into the smelting furnace; [0005] S2, melt [0006] The smelting furnace is heated to 740-750 degrees Celsius, and the solid aluminum raw material in it is heated and melted; [0007] S3, refined [0008] Manually, the refining gas (argon and nitrogen) is blown into the smelting furnace by using a steel pipe, and the molten aluminum is manually stirred to make the refining gas and the liquid mix as fully as possible; [000...

AI Technical Summary

Problems solved by technology

[0013] 1) Manual operation, high site temperature, harsh working environment and low work efficiency;

[0014] 2) The furnace door is opened to feed materials, and the heat loss is large;

[0015] 3) Manual stirring, the molten aluminum rolls and burns;

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