The rotary degassing system is used to remove solid solution gas and non-metallic inclusions from molten metal, continuously introduce molten metal into it for degassing operation, and continuously remove degassed molten metal therefrom. The rotary degassing system is used to generate bubbles of inert gas diffused into the molten metal, thereby trapping solid solution gases and non-metallic inclusions in the bubbles, then floating and separating them.
On-line degassing equipment for continuous flow of non-ferrous molten metal, equipment includes:
- Online degassing container, which has sidewalls and bottom walls, used to define a chamber for storing non-ferrous molten metal therein;
- The inlet on one side of the container is used to receive the non-ferrous molten metal to continuously flow into the container to degas the material in the container;
- The outlet on the other side of the container is used to discharge the continuous degassing flow of non-ferrous molten metal from the container;
- The rotating gas diffusion device for inert gas in the container. The rotating motion of the rotating gas diffusion device generates bubbles of inert gas diffused into the non-ferrous metal melt stored in the container to continuously remove the solid solution gas from the non-ferrous metal melt or materials in non-metallic inclusion containers;
- The heater is located in the molten metal stored in the container, and at least one heater is located roughly below the gas diffusion device;
- There are multiple baffles on the inner surface of the sidewall, and the gas diffusion device is surrounded by baffles.
The rotary degassing system for molten metal working principle 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.