Smelting method for molten aluminum

Abstract

The invention relates to a smelting method for molten aluminum, and belongs to the technical field of casting. The smelting method comprises the following steps that an aluminum ingot is placed in a smelting furnace, the temperature of the smelting furnace is adjusted to 700 DEG C-720 DEG C, the aluminum ingot in the smelting furnace is completely smelted into the molten aluminum, purified mixed gas is prepared, the purified mixed gas is prepared from the following gas including 10% of chlorine gas, 10% of carbon dioxide and 80% of nitrogen gas according to the volume ratio, the purified mixedgas is led into the molten aluminum, the molten aluminum is stirred, stirring is stopped after the molten aluminum is stirred by two minutes, the molten aluminum is standing for three minutes, drossfloating on the surface of the molten aluminum can be removed by a dross collecting device, and the above steps are repeatedly executed until the dross is completely removed. The smelting method has the beneficial effects that the molten aluminum is purified by the purified mixed gas, hydrogen in the molten aluminum can be removed, the dross in the molten aluminum can be removed, and the smeltingmethod is novel in structure and convenient to operate.

Description

Technical field: [0001] The invention relates to a smelting method for molten aluminum, which belongs to the technical field of casting. Background technique: [0002] Aluminum alloys are prone to air inhalation and slag inclusions during smelting and production. Air inhalation will cause pores and looseness in the product, thereby reducing the density of the product; slag inclusions will increase the hardness and affect the quality of subsequent processed products. , or damage the processing equipment. We know that there is no aluminum alloy melt with high purity, no matter how good the effect of metamorphism and grain refinement in the smelting process is, no matter how complete the production process and heat treatment process are, once the defects exist from the beginning, it will be difficult to eliminate , so it is difficult to produce high-quality products. [0003] In addition, there is a strong interaction between the gas and slag inclusions in the aluminum alloy ...

AI Technical Summary

Problems solved by technology

[0002] Aluminum alloys are prone to air inhalation and slag inclusions during smelting and production. Air inhalation will cause pores and looseness in the product, thereby reducing the density of the product; slag inclusions will increase the hardness and affect the quality of subsequent processed products. , or damage the processing equipment

We know that there is no aluminum alloy melt with high purity, no matter how good the effect of metamorphism and grain refinement in the smelting process is, no matter how complete the production process and heat treatment process are, once the defects exist from the beginning, it will be difficult to eliminate , so it is difficult to produce high-quality products

[0003] In addition, there is a strong interaction between the gas and slag inclusions in the aluminum alloy solution. Therefore, slag removal and hydrogen removal should be carried out at the same time, and the melt purification should cover the entire production process. Purification technology covering the entire production process

[0004] The aluminum alloy solution must be dehydrogenated before casting. The current dehydrogenation method is relatively complicated, and the dehydrogenation effect is poor, which cannot meet the needs of users.