Aluminum foundry foam ceramic filter is a new type of filter plate made of an industrial sponge as a carrier, filled with heat-resistant ceramics, and then sintered.

When the aluminum foundry foam ceramic filter plate filters the molten aluminum, the molten aluminum flows through the tortuous holes of the ceramic filter plate. The non-metallic impurities and oxide film in the molten aluminum are affected by the combined action of the axial pressure, friction, and surface adsorption of the molten aluminum. It is retained in the holes and gaps of the ceramic filter plate, thereby separating the slag and the molten aluminum.

After a period of filtering, the slag remaining on the ceramic filter plate also participates in the adsorption of the slag, which can play a filtering role. Because the slag adsorbed on the ceramic filter plate has the same performance as the slag to be adsorbed, its surface area ratio is much larger than that of the ceramic filter plate, and the surface activity is much greater than that of the ceramic filter plate, so the ability to adsorb the slag in the aluminum liquid is much greater than that of the ceramic filter plate. Therefore, the ceramic filter plate can filter out the fine slag that is many times smaller than its own hole.

In the filtering process, the slag adsorbed on the ceramic filter plate gradually grows up after adsorbing and cutting the slag in the aluminum liquid. Under the agitation and scouring of the liquid flow, the extremely low-strength slag may break or fall off the ceramic filter plate. In the process of slag shedding, if the ceramic foundry filter plate is thicker or has small holes, it may be intercepted or adsorbed again. Therefore, generally speaking, the thicker the ceramic plate, the smaller the holes, and the slower the flow rate of the molten aluminum through the ceramic plate, the better the filtering effect. The total amount and cleanliness of the molten aluminum do not affect the filtering effect, but will affect the life of the ceramic filter plate.