Molten Aluminum Degassing Unit

During the smelting process of aluminum metal, the molten aluminum will react with water vapor to produce hydrogen and dissolve into the molten aluminum. When the molten aluminum solidifies, hydrogen will precipitate out of the molten aluminum. If the hydrogen content in the molten aluminum is too high, pores are easily formed in the castings, and the mechanical properties of the castings will decrease. In severe cases, the castings will be scrapped. Hydrogen is a harmful gas in the molten aluminum. The hydrogen content of the molten aluminum is tested before the furnace to ensure the quality of the castings. Important processes, especially in the precision die-casting process, the use of molten aluminum degassing unit to remove hydrogen and slag will become indispensable.

Molten aluminum degassing unit is suitable for workplaces: auto parts die-casting, aluminum alloy die-casting products, lighting aluminum alloy shell, aluminum alloy spotlight shell, automobile lamp aluminum alloy shell, LED lamp aluminum alloy lamp shell, aluminum alloy die-casting heat sink, aluminum alloy Die-casting tools, aluminum alloy die-casting parts, pure aluminum die-casting heat sinks, precision auto parts and other aluminum casting and smelting processes.

The molten aluminum degassing unit is a kind of pollution-free green aluminum liquid purification treatment equipment. Its principle is to agitate the aluminum liquid through a controlled rotating graphite shaft and a rotor, and at the same time, a metered inert gas is pressed into the aluminum liquid through the rotor and dispersed into Tiny bubbles are uniformly dispersed in the molten metal, and the gas partial pressure of the bubbles is zero. Due to the high partial pressure of hydrogen in the molten aluminum, the hydrogen in the molten aluminum continuously diffuses into the bubbles, and at the same time, some non-metallic inclusions in the molten aluminum are adsorbed on the surface of the bubbles, and the useless hydrogen and some non-metallic inclusions are inert. The gas bubbles float up to the liquid surface.

When there is a special degassing and filter box, these slags are isolated before pouring, and then the slag skimming achieves the removal of hydrogen and oxide inclusions. The principle of degassing is also recognized, with high efficiency and good effect, does not affect the production process, and can improve the purity of molten aluminum in a short time. The molten aluminum degassing filter box reduces the waste rate, improves the production efficiency, improves the mechanical properties of the castings, and enhances the competitiveness of the products, which cannot be achieved by the traditional degassing method.

Graphite materials, alumina materials, and silicon carbide materials can be suitable for stirring. However, due to the high temperature resistance of graphite rods, low thermal expansion coefficient (resulting in high temperature and low temperature conversion without cracking), moderate strength, high purity, no reaction with molten aluminum, and moderate prices, most manufacturers use graphite rods for stirring. However, if graphite rods are used as the degassing rotor, two points need to be noted:

The graphite processing precision should be high, especially the coaxiality, otherwise it is easy to be broken during the rotation.

The graphite material must be treated with anti-oxidation, so as to ensure a long enough service life, otherwise it will be consumed quickly.