The hydrogen content and non-metallic impurities of the molten aluminum alloy in the melting and casting workshop will seriously affect the quality of the casting. Usually during the condensation process, as the solubility of hydrogen decreases, it is too late for hydrogen to escape from the solution, and it is too late for non-metallic magazines to float to the liquid surface before entering the crystallizer, which will cause plates and foils in the subsequent rolling process. The white spots and pinholes on the surface of the material increase, and the mechanical properties of the material decrease, which eventually leads to the scrap of the product. Therefore, the Aluminum Degassing Treatment is important.
Aluminum Degassing Treatment
The working principle of the Aluminum Degassing Treatment is to use the inert gas that does not chemically react with the aluminum liquid at the melting temperature, and is insoluble in the melt.
It is blown into the aluminum liquid by the high-speed rotating graphite shaft to form a large number of continuous small bubbles.
When the inert gas bubbles rise from the bottom of the melting chamber, due to the pressure difference, the hydrogen in the melt will continue to diffuse to the bubbles.
After the bubbles rise to the surface, the hydrogen in the bubbles escapes into the atmosphere. In the process of bubble floating, when encountering non-metallic inclusions, due to the effect of surface tension, the inclusions adhere to the surface of the bubble, and these inclusions are removed as the bubble rises.
At the same time, the filter medium in the filter cavity will further block the inclusions, so that the magazine sediment is blocked in the filter medium, so that the aluminum liquid can be thoroughly purified.
Plate filter box products are necessary equipment for continuous casting and semi-continuous casting filtration purification system to form stable filtration.