Rotary degassing unit is a piece of special purification equipment for the non-ferrous metal casting industry. It performances well in corrosion resistance,
Due to its light weight, aluminum is a metal often used for its relative strength. However, when casting aluminum, impurities called inclusions create weak spots in the product. There are many reasons for these inclusions, but they are most common in the presence of hydrogen. Hydrogen is soluble in liquid aluminum and can pass through molten aluminum almost as easily as through air. As the liquid metal cools and hardens, hydrogen flows from the high pressure region to the low pressure region. It coalesces and produces gas pockets, which become inclusions and weak points when metal solidifies. Degassing is a process used to remove hydrogen from molten aluminum.
Rotary Degassing Unit
With the increasing demand for high-quality aluminum products, especially in the aerospace industry, the need to reduce inclusions in molded products also increases. A popular dehydrogenation method involves introducing bubbling nitrogen into liquid aluminum. Hydrogen is drawn into nitrogen bubbles, which are then absorbed by aluminum and released to the surface. Argon is also very effective, but due to the high cost associated with this gas, nitrogen is preferred.
The rotating degasser decomposes the large bubbles of inert gas into very small bubbles through the high-speed rotating rotor, and injects the inert gas, which is evenly dispersed in the molten metal.
By reducing the diameter of bubbles, the total surface area of these bubbles will increase dramatically, which will cause more surfaces of inert bubbles to come into contact with hydrogen and impurities in molten metal, thus bringing these harmful substances to the metal surface. Liquid.
By controlling the flow rate of liquid aluminum to inert gas, the gas flow can be adjusted according to the amount of liquid metal being treated, and the speed of rotating rod and rotor can be adjusted to produce appropriate bubbles. Size to facilitate the diffusion of inert gases.