22 4月 Foundry Degassing Molten Aluminum
Foundry Degassing Molten Aluminum uses a patented rotor impeller principle, which can generate tiny inert bubbles and mix with the melt.
These small bubbles are evenly distributed on the surface of the melt, thereby maximizing the contact area between the inert gas and the melt.
Effective means that a higher level of degassing and cleaning can be achieved, and processing time can be reduced.
Various sizes and designs of machines can be provided to meet the needs of various foundries. Rotary degassing device is mainly used to remove hydrogen and slag from molten aluminum.
Foundry Degassing Molten Aluminum adopts the principle of air flotation. The rotor injects inert gas or a mixture of chlorine and inert gas into the molten aluminum, crushes the gas into dispersed tiny bubbles, and the bubbles rise to the surface of the molten aluminum. At the same time, the following steps are completed:
H is absorbed in the bubbles and removed.
Chloride is removed (formed by the chemical action of alkali metals and chlorine).
Remove the slag.
The hydrogen content and non-metallic impurities in the aluminum alloy liquid in the melting and casting workshop will seriously affect the quality of the castings. Usually during the condensation process, the solubility of hydrogen decreases, it is too late for the hydrogen to escape the solution, and it is too late for the non-metallic magazine to float before entering the crystallizer liquid level, which will lead to the subsequent rolling process plates and foils. The white spots and pinholes on the surface of the material increase, and the mechanical properties of the material decrease, which ultimately leads to the scrap of the product. Therefore, the degassing treatment of aluminum is very important.
Aluminum degassing treatment
The working principle of aluminum degassing is to use inert gas that does not chemically react with aluminum liquid at the temperature of the melt and is insoluble in the melt.
It is blown into the aluminum liquid by the high-speed rotating graphite shaft, forming 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 toward the bubbles.
After the bubble rises to the surface, the hydrogen in the bubble escapes into the atmosphere. In the bubble floating process, when encountering non-metallic inclusions, due to the effect of surface tension, the inclusions adhere to the surface of the bubble, and as the bubble rises, the inclusions are removed.
At the same time, the filter medium in the filter cavity will further block the inclusions, so that the magazine sediment will be 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 filter purification system to form stable filtration.