The demand for higher-quality aluminum products is progressively on the rise, especially in cutting edge industries like aerospace. Degassing is a process used to remove the hydrogen from the molten aluminum. The most popular aluminium degassing with nitrogen method involves introducing nitrogen gas into the liquid aluminum. The hydrogen causing these inclusions is simply drawn to the nitrogen bubbles, then carried up through to the surface and released, thus eliminating the hydrogen gas pockets causing the impurities.
Hydrogen gas is soluble in liquid aluminum and can pass through it almost as easy as it passes through air. As the liquid metal cools and becomes hard, the hydrogen flows from areas of high pressure to areas of low pressure which creates pockets of gas. When the metal solidifies, those pockets become inclusions and weak spots in the castings.
Aluminum Degassing Treatment
AdTech improves the volume of nitrogen bubbles by improving the rotating nozzle in the process of purifying nitrogen, and increases the contact area between nitrogen and aluminum, thereby improving the effect of degassing and slag removal, and achieving the purpose of aluminum purification.
Aluminium degassing with nitrogen treatment is the rotor can decompose the incoming nitrogen bubbles into small bubbles and spread them throughout the molten metal.
By reducing the diameter of the bubble, the surface area of nitrogen is increased sharply, so that more nitrogen surface is in contact with hydrogen and impurities in the molten metal, and as the bubble rises, hydrogen or impurities are removed from the aluminum liquid.
The flow control of the on-line degassing unit into the aluminum nitrogen can adjust the gas flow according to the volume of the metal liquid to be processed, and can adjust the speed of the rotating rod and the rotor to generate bubbles. Proper size to promote the diffusion of inert gas.