Molten metals such as aluminum and aluminum alloys are expected to remove large amounts of impurities during the refining process. In a known refining process, aluminum is melted in a furnace and then transferred to a casting machine for metal forming. Aluminum is usually transferred from the furnace to the casting machine through the trough. The molten aluminum flows into the groove at the inlet and flows out at the outlet in a substantially continuous manner through the groove.
There will be a part of hydrogen and impurities in the molten aluminum in the launder. These impurities may adversely affect the performance of the final product during the casting process.
The molten metals refining process usually uses a flux injection mechanism, which introduces flux into the molten aluminum. Generally, the fluxes include chlorine or a mixture of chlorine and an inert gas such as argon. When combined, the flux can help remove impurities from the molten aluminum.
Chlorine gas and chloride salts can effectively convert alkali metals into salts, which coalesce under the action of additives and rise to the surface of the molten material. In particular, hydrogen diffuses into inert bubbles and is removed as particles around the bubbles coalesce and rise to the top of the molten aluminum alloy. Flux and impurities form slag or waste by-products, which are regularly skimmed or captured in downstream filters. Usually, the chloride salt is removed together with the scum. However, due to the damage to the environment and the burden of disposal, the use of chlorine should be reduced.
AdTech has developed online aluminum processing equipment. The degassing filter equipment is used for degassing and filtering molten aluminum. On-line degassing equipment mainly processes molten aluminum containing a certain amount of hydrogen and other residues (alkali metals, inclusions), which are removed after being processed by degassing equipment.