In order to further improve the quality of the aluminum alloy liquid, or when certain grades of aluminum alloy require strict control of the hydrogen content and inclusions, the joint aluminum refining method can be used, that is, two refining methods are used simultaneously. For example, chloride salt-filtration combined refining, argon blowing-flux combined refining, on-line degassing and filtration equipments can achieve better results than single refining.
Aluminum Refining Method
The aluminum casting flux is injected into the molten Al, spraying it onto the surface of the melt. The injection method is the same as that of conventional refined flux. In order to improve efficiency, it is preferable to inject fluxes powder into molten Al from a nozzle or spray gun, inserted into molten Alu together with an inert gas as a carrier such as N2 or Ar gas.
The rotor is connected to a source of premixed chlorine and nitrogen. When the molten aluminum passes through the degassing unit, the aluminum is first exposed to the chlorine and nitrogen mixture escaping from the holes of the inlet rotor, and bubbles rise through the molten metal.
After leaving the outlet of the degassing device, the molten aluminum is passed through a ceramic foam filter (CFF) and then cast into an ingot or other desired shape.
Foundry degassing device 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.
Plate CFF filter box products are necessary equipment for continuous casting and semi-continuous casting filter purification systems to form stable filtration. The ceramic foam 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.