The molten aluminum filter material has numerous micropores uniformly distributed in the network state, and the pore size is slender and curved, and has good permeability. It has the characteristics of a capillary tube, so the solid particles form an arch bridge at the diameter of the micropore, which has little effect on the filtration rate and will not block the micropore.
During the filtration process, the aluminum melt is blocked by the filter plate and flows along the tortuous channels and the holes in the filter plate.
The impurities and inclusions in the aluminum melt are in contact with the inner surface of the filter plate hole under the influence of deposition, inertia, interception, etc., and stay in the gaps, shrinkage holes, caves and other places of the filter plate, and are affected by the axial direction of the melt. Impact. The impurities and inclusions in the aluminum melt are firmly left on the filter plate and separated from the aluminum melt.
In large enterprises, during continuous or semi-continuous processing, aluminum will be filtered from several tons of liquid aluminum to hundreds of tons of liquid aluminum. This requires a large area filter that is installed in the system to transfer the melt from the melting or transfer furnace to the casting equipment.
The service life of a single ceramic filter plate depends on the size of the filter plate, the number of holes and the cleanliness of the metal. For a single filter plate, the size and number of holes are fixed.
In order to improve the molten aluminum filter material filtration effect, some manufacturers consider two-stage filtration, usually combined with a coarse screen and a fine screen. The filtering effect is good. For about 20-30u impurities and inclusion particles, the removal rate can reach 75%-90%. More flexible. The cleaning of the CFF filter box and the replacement of the filter plate are simple, convenient and fast, and very flexible in the production of various alloys.