17 6月 Aluminium Degassing solutions with nitrogen
Aluminium Degassing solutions with nitrogen
Aluminium Degassing solutions with nitrogen has always been the subject of research on aluminum alloy casting and rolling, and the purity of the nitrogen used for refining in the purification device is a key factor that directly affects the purification effect.
Both argon and nitrogen can be used as an inert gas to degas the molten aluminum. The purity of the inert gas must be above 99.99%.
Degassing is the purpose of spraying Nitrogen into molten aluminum to remove hydrogen.
In addition, degassing is also considered to be a very effective way to float impurities.
Two main theoretical modes have been proposed to explain the principle of degassing. The macro mode considers that the removal of each impurity is similar in nature. The microscopic mode, that is, according to this theory, due to the higher vapor pressure of hydrogen, the dissolved hydrogen diffuses into the gas in the injected aluminum liquid.
Theoretically, an inclusion having a diameter of 10 microns contacts a bubble and is adsorbed on the bubble and floats up to the surface of the liquid.
What is the basic principle of Aluminium Degassing solutions with nitrogen and degassing of aluminum alloy liquid?
Nitrogen gas is ejected from the graphite nozzle of the rotary degasser and floats up in the aluminum liquid.
The hydrogen partial pressure in the nitrogen bubble just emerging from the graphite nozzle is 0. When the nitrogen floats, the hydrogen diffuses from the aluminum liquid into the nitrogen bubble under the driving force of the hydrogen pressure difference, and the process until the hydrogen partial pressure in the nitrogen bubble When the hydrogen partial pressure in the aluminum liquid is balanced, the nitrogen phase is stopped, and then the nitrogen gas is floated up to the surface to be removed, thereby degassing.
AdTech Aluminium Degassing Unit refined the volume of nitrogen bubbles by improving the rotating nozzle in the process of purifying nitrogen purification, and increased the contact area between nitrogen and aluminum, thereby improving the effect of degassing and slag removal, and achieving the purpose of aluminum purification. Improve the quality of the product.
Through the improvement of the rotating nozzle in the process of purifying nitrogen cleaning aluminum, the volume of nitrogen bubbles is refined, the contact area of nitrogen and aluminum liquid is increased, thereby improving the effect of degassing and removing slag, achieving the purpose of purifying aluminum liquid, and finally improving Quality of products.
The rotary degasser breaks up the Nitrogen large bubble into a very fine small bubble by rotating the Nitrogen rotor at a high speed and uniformly disperses it in the molten metal.
By reducing the diameter of the bubbles, the total surface area of ??these bubbles increases sharply, which causes more Nitrogen bubble surfaces to come into contact with hydrogen and impurities in the molten metal to bring these harmful substances to the surface of the liquid.
The key to degassing the rotary degasser is that the rotor can break up the incoming Nitrogen bubbles into small bubbles and spread them throughout the molten metal. By reducing the bubble diameter, the surface area of ??Nitrogen is drastically increased, so that more Nitrogen surface contacts the hydrogen and impurities in the molten metal and the hydrogen or impurities are removed from the aluminum liquid as the bubbles rise.
The flow control into the aluminum Nitrogen can adjust the flow rate of the gas according to the volume of the metal liquid being treated, and the speed of the rotating rod and the rotor can be adjusted to produce a bubble of an appropriate size to facilitate the diffusion of the inert gas.