Online Metal Degassing Systems can effectively remove the hydrogen content in aluminum alloy, and can ensure that the cast-rolled billet used to produce ultra-thin aluminum foil meets the quality requirements.
The quality of the purified cast-rolled billet of the aluminum melt determines whether the 0.005mm aluminum foil can be rolled and the number of pinholes in the finished product. For this reason, special requirements are required for the quality of cast-rolled billets:
When the aluminum liquid passes through the degassing unit, the high-purity N2 online degassing method is used, and the alumina ceramic foam filter is used for melt degassing and slag removal, so that the hydrogen content in the melt is controlled below 0.9mL/(kgAl).
Through the continuous bottom blowing of high purity N2 technology at the bottom of the furnace, the precise control technology of alloy composition, the continuous online degassing of the melt and the three-stage filtration technology, the oxidation atmosphere in the furnace is reduced, and the aluminum metal burning loss is reduced while ensuring the stable and uniform alloy composition. At the same time, it can purify the melt, eliminate most of the gas and inclusions in the melt, reduce the content of impurity elements, and make the chemical composition of the aluminum melt more stable.
Metal Degassing Systems Features
The rotating impeller works by increasing the surface area of the inert gas introduced into the metal.
The smaller nitrogen bubbles produced by the impeller process have a larger total surface area and collect more hydrogen.
The lower surface disturbance of the smaller bubbles also allows less hydrogen to be recaptured into the metal from atmospheric moisture.
The aluminum degassing process in the casting process is to remove inert gases (argon, nitrogen) through the rotating shaft and rotor.
The energy of the rotating shaft results in the formation of a large number of small bubbles, thereby providing a very high surface area to volume ratio.
The large surface area promotes the rapid and effective diffusion of hydrogen into the bubbles, thereby equalizing the hydrogen activity in the liquid and gas phases.
Compared with flux degassing, the rotary degasser can remove hydrogen more thoroughly.