Molten aluminum degassing machine adopts 99% argon or nitrogen as degassing medium to remove aluminum slag and hydrogen.
Molten Aluminum Degassing Machine Working principles
After the silicon nitride rotor of degasser is put into liquid aluminum, the metered inert gas is pressed into liquid aluminum and dispersed into tiny bubbles, so that the gas partial pressure of bubbles uniformly dispersed in molten metal is zero.
Due to the high pressure of hydrogen in molten aluminum, the hydrogen in molten aluminum continuously diffuses into bubbles, and nonmetallic inclusions in molten aluminum are adsorbed on the surface of bubbles.
Useless hydrogen and inert bubbles attached to non-metallic inclusions will float to the surface of liquid, so as to remove hydrogen and oxide inclusions by degreasing.
The degassing equipment is equipped with on-line molten aluminum temperature measurement device, which can understand the change of molten aluminum temperature during degassing process, so that the operator can know whether the molten aluminum meets the casting temperature requirements.
Many by-products are produced in the process of aluminum smelting and forming.
As the main by-product of aluminum industry, aluminum ash will be produced in all processes of aluminum melting, and the aluminum content accounts for 1-12% of the total loss in aluminum production and use.
In the past, aluminum slag was discarded as waste. This not only causes the waste of aluminum resources, but also brings about environmental problems.
In the smelting process of cast aluminum alloy, a large amount of hydrogen in molten aluminum can be removed by aluminum refining machine.
When molten aluminum solidifies at 660 ° C, the solubility of hydrogen decreases sharply.
Due to the high cooling rate and low melt temperature, hydrogen cannot escape from the solidified aluminum.
Residual hydrogen in the casting can form casting defects such as pinholes and porosity.
Therefore, gas and inclusions must be removed from the molten aluminum alloy during purification (also known as refining).