The degassing equipment for molten aluminum rotates the ejector immersed in the melt so that the scavenging gas (usually an inert gas) is distributed in the melt in the form of small bubbles to purify the aluminum melt and perform hydrogen degassing.
The fewer and more frequent the bubble removal, the better the melt can be degassed and there is no oxide impurities.
Degassing equipment for molten aluminum can not only be used in the degassing process, but also can remove residual oxides on the surface through baffles (knives) when properly operated.
Rotary degassing is usually combined with an inert gas (such as nitrogen) suitable for the affected melt.
In some cases, the inert purge gas will also be mixed with low concentrations (<2.5%) of sulfur hexafluoride or chlorine.
In aluminum melt, due to the fine distribution of the rotor purge gas, the hydrogen content is greatly reduced compared with other purge gas methods.
Using this principle, almost any bath surface can be cleaned-a very wide bubble distribution is achieved in the entire processing vessel, and the processing time can be shortened by effective degassing and melt purification.