Ceramic foam filters have special applications in the filtration of molten metals, especially aluminum.
In fact, molten metal, especially molten aluminum, often contains entrained solids, which are harmful to the final cast metal product. These entrained solids appear as inclusions in the final cast product after the molten metal is solidified, and cause the ductility of the final product to decrease or the smoothness and anodizing properties of the final product are poor. Inclusions may come from several sources. For example, inclusions may originate from a surface oxide film, which is broken and entrained in the molten metal. In addition, inclusions may come from insoluble impurities, such as carbides, borides, or corroded furnace and tank refractories.
These ceramic foam filters are particularly suitable for filtering molten metal for a variety of reasons, including excellent filtration efficiency, low cost, ease of use, and one-time use and one-time use capabilities. These ceramic foam filters are convenient and inexpensive to prepare and can be used once.
This fact requires the development of a device that can easily and conveniently assemble and remove the porous molten metal filter from the filter unit while providing an efficient filter assembly. Since the filter is designed as a disposable item, it is necessary to provide an effective method to seal the filter in its holder for easy assembly, disassembly and cleaning.
Use an elastic sealing device or a gasket-type seal to seal the filter plate in place. The sealing device surrounds the ceramic foam filter plate at the periphery of the beveled portion of the filter plate. Gasket seals ensure leak-free installation and provide an effective separation medium, which is essential for easy disassembly. In addition, since the gasket or sealing device prevents metal from entering the sealing surface of the holder unit, their use greatly simplifies cleaning and effectively extends the life of the unit by eliminating the problem of metal corrosion. In addition, due to its elasticity, the gasket can provide sufficient friction to hold the filter body in place in the holder or filter chamber without resorting to other types of pressing devices. The elastic sealing device should not wet the specific molten metal, resist its chemical attack, and should be fire-resistant enough to withstand higher operating temperatures.